CN101299464A

CN101299464A - Proton conductive membrane, membrane electrode assembly, and fuel cell

Info

Publication number: CN101299464A
Application number: CNA2008100998309A
Authority: CN
Inventors: 田村淳; 中野义彦; 太田英男
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2004-07-21
Filing date: 2005-07-21
Publication date: 2008-11-05
Anticipated expiration: 2025-07-21
Also published as: CN1741311A; JP4625658B2; CN101299464B; JP2006032287A; CN100405644C

Abstract

A proton conductive film, membrane electrode assembly and fuel cell, the proton conductive film comprises proton conductive inorganic oxide having solid peracidity, and hydrophilic polymer of at least one radical selected from hydroxyl, carboxyl and amido link. The membrane electrode assembly and fuel cell respectively comprises a fuel electrode, an oxidizing agent electrode, and an electrolyte membrane provided between the fuel electrode and the oxidizing agent electrode, wherein, at least one of the fuel electrode, the oxidizing agent electrode and the electrolyte membrane contains a proton conductive inorganic oxide having solid peracidity, and hydrophilic polymer of at least one radical selected from hydroxyl, carboxyl and amido link.

Description

Proton conductive membrane, membrane electrode assembly and fuel cell

The application is to be dividing an application of July 21, application number were 200510085950.X in 2005 application for a patent for invention " proton conducting solid electrolyte, proton conductive membrane, the electrode that is used for fuel cell, membrane electrode assembly and fuel cell " applying date.

Technical field

The present invention relates to proton conductive membrane, comprise the membrane electrode assembly of proton conductive membrane and the fuel cell that comprises membrane electrode assembly.

Background technology

People are to being applied in electrochromic material and the transducer, especially in recent years the proton conducting solid electrolyte in the fuel cell that is applied to have under the low-temperature working state high-energy-density being carried out extensive studies.

Fuel cell comprises proton conductive membrane.Fuel electrode (being also referred to as anode) is formed on the one side of proton conductive membrane, and oxidant electrode (being also referred to as negative electrode) is formed on the another side of proton conductive membrane.Fuel such as hydrogen or methyl alcohol are supplied to fuel electrode (anode), and oxidant is supplied to negative electrode.Fuel is turned to proton and electronics at anode by electrochemistry oxygen, and electronics flows into external circuit.The proton of Xing Chenging is transferred to negative electrode by proton conductive membrane thus, and the result makes and oxidant and the electron reaction that provides from external circuit generates water, produces electric energy thus.

Usually adopt the amberplex that forms by the organic polymer material that contains perfluorinated sulfonic acid now as proton conductive membrane.Particularly, existing proton conductive membrane comprise for example contain tetrafluoroethene-perfluorovinyl sulfide ether copolymer as host material, sulfonic group is as the electrolyte of ion-exchange group.The example of this proton conductive membrane is the NAFION film that E.I.Du Pont Company makes.The polymeric material that contains perfluorinated sulfonic acid in employing reduces water contained in the film as under the electrolytical situation by oven dry, to reduce proton conductive.As a result,, need strict water management, make system very complicated thus utilizing under the above-mentioned electrolytical situation under about 100 ℃ of high output can obtaining.And the polymeric material that contains perfluorinated sulfonic acid has a bunch shape structure, causes sparse molecular structure, causes liquid organic fuel such as methyl alcohol penetrate dielectric film to reach the flow phenomenon of striding of negative electrode thus.Striding the position that flow phenomenon takes place, the direct and oxidant reaction of the liquid fuel of being supplied causes to be converted into electric energy.Caused the problem that can not obtain stable output thus.

As the inorganic acidic group amberplex, for example, a kind of metal oxide that supports sulfuric acid and have the solid peracidity is disclosed in TOHKEMY No.2002-216537.Particularly, sulfuric acid is supported on the oxide surface that contains at least a element in selected among zirconium, titanium, iron, tin, silicon, aluminium, molybdenum and the tungsten, and the oxide that supports sulfuric acid is heat-treated, to be solidificated in the sulfuric acid on the oxide surface.In the metal oxide that supports sulfuric acid, produce proton conductive by the sulfate group that solidifies.Yet,, therefore reduced proton conductive because sulfate group is hydrolyzed decomposition.Thereby when considering the proton conductive membrane the when metal oxide that supports sulfuric acid is in the fuel cell that produces water therein in power generation process, in the fuel cell of employing liquid fuel is unsettled.

In addition, in TOHKEMY 2003-142124, disclose the metal oxide hydrate that will show proton conductive and be used as proton conducting material.But the problem that adopts metal oxide hydrate to exist is, if because the water in the hydrate has been removed in the oven dry that generating at high temperature causes, the structure of metal oxide hydrate is shunk, even water is provided afterwards, metal oxide also can't be got back to original hydrate forms, can't obtain enough power generation performances.

Summary of the invention

The purpose of this invention is to provide a kind of proton conductive membrane, membrane electrode assembly and fuel cell that can produce high output characteristic.

According to first scheme of the present invention, a kind of proton conductive membrane is provided, comprising: proton conductive inorganic oxide with solid peracidity; With the hydrophilic polymer material that contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.

According to alternative plan of the present invention, provide a kind of comprise fuel electrode, oxidant electrode and be arranged on fuel electrode and oxidant electrode between the membrane electrode assembly of dielectric film; Wherein at least a of fuel electrode, oxidant electrode and dielectric film comprises: the proton conductive inorganic oxide with solid peracidity; With the hydrophilic polymer material that contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.

In addition, according to third party's case of the present invention, provide a kind of comprise fuel electrode, oxidant electrode and be arranged on fuel electrode and oxidant electrode between the fuel cell of dielectric film; Wherein, at least a of fuel electrode, oxidant electrode and dielectric film comprises: the proton conductive inorganic oxide with solid peracidity; With the hydrophilic polymer material that contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.

Description of drawings

Fig. 1 is the structural section schematic diagram of expression according to the fuel liquid battery of a kind of execution mode of fuel cell of the present invention; With

Fig. 2 is the schematic cross-section of the liquid fuel power pool structure of the expression embodiment of the invention 1.

Embodiment

As mentioned above, disclosed fuel cell can not produce high output in the aforementioned patent document.In addition, following other problem has appearred in fuel cell.Particularly, the proton conduction in proton conducting solid electrolyte needs a large amount of water, thereby need provide enough a large amount of water to electrolyte.Therefore, in order to obtain stable electric current supply, water management is adopted in absolute demand, and water management needs complicated system.And, adopting liquid fuel for example in the fuel cell of methyl alcohol, can not control the stream of striding of methyl alcohol fully, therefore can't obtain stable output.

According to following proton conductive inorganic oxide, can make fuel cell produce high output characteristic.In addition, carry out water management easily, can suppress the stream of striding of liquid fuel such as methyl alcohol.In addition, can make in the wide temperature range of ionic conductivity between room temperature and about 150 ℃ high temperature and keep high stability.

Proton conductive inorganic oxide comprises oxide carrier and is supported on the lip-deep oxide particle of oxide carrier, oxide carrier contains the element Y that is made of at least a element that is selected from Ti, Zr, Si and Al, and oxide particle contains the element X that is made of at least a element that is selected from W, Mo, Cr and V.At this this specific oxide is called for short the proton conductive inorganic oxide of making to contain element X and Y.

Proton conductive mechanism in the proton conductive inorganic oxide that contains element X and Y is not also understood fully.But think that a kind of rational understanding is, because containing the oxide particle of element X is that oxide particle B is supported on the surface that the oxide carrier that contains element Y is oxide carrier A, in the structure of oxide particle B, formed the lewis acid point, aquation by lewis acid point has formed the Bronsted acid point, forms proton conductive thus.Another kind is reasonably understood, and proton conductive inorganic oxide has non crystalline structure, and non crystalline structure helps lend some impetus to the formation of lewis acid point equally.

Except the proton that is undertaken by the lewis acid point forms reaction, also can reduce the molecular amounts of the required water entrainment of proton conductive, can obtain high proton conductivity with the low amounts of water molecule that on the surface of proton conductive inorganic oxide, exists.In this case, need not to carry out strict water management and just can obtain high power density at power generating stage.In the case, can reduce cell resistance by the mode that at least one that makes fuel electrode, oxidant electrode and dielectric film contains proton conductive inorganic oxide, increase the maximum power density of fuel cell.

It shall yet further be noted that according to the proton conducting solid electrolyte that contains proton conductive inorganic oxide, can suppress liquid fuel such as methanol permeation.Especially,, can further increase the density of proton conducting solid electrolyte, more effectively suppress the infiltration of liquid fuel if add polymeric material for the bonding of proton conductive inorganic oxide.

Point out that in passing although oxide particle B water soluble is can be according to the component of oxide and the environment change solubility of pH value.Because oxide particle B is supported on the surface of the oxide carrier A that has low solubility in water, therefore can suppresses the dissolving of oxide particle B in water, thereby can improve the stability of proton conductive inorganic oxide with respect to water and liquid fuel.Can also avoid other fuel cell material that the elution ion by oxide particle B causes and the pollution of fuel cell system.Therefore, according to the present invention, can obtain showing the fuel cell of high reliability for a long time.In addition, because cheap oxide carrier A is used as host material, so the manufacturing cost of may command fuel cell.

The lip-deep structure that oxide particle B is supported on oxide carrier A can be confirmed by device analysis such as X-ray diffraction (XRD), electron probe microanalysis (EPMA) (EPMA), x-ray photoelectron spectroscopy (XPS) or energy dissipation type x-ray analysis (EDX).And because oxide particle B is colored, that is, W is that yellow, Mo is that grey, Cr are that green, V is orange, and oxide carrier A be which kind of metal is white, therefore also can carry out naked eyes and confirm.

Synthesis oxide carrier A by the following method: vapor phase method wherein obtains oxide by the gas that decomposition contains element Y (that is, being selected from least a element of Ti, Zr, Si and Al); Perhaps obtain by for example sol-gel process, the metal alkoxide that wherein will contain above-mentioned element Y is as raw material.Certainly, in the present invention to the restriction especially of the synthetic method of oxide carrier A.Can also adopt the composite oxides that contain multiple element as oxide carrier A.Particularly, can adopt for example TiO ₂, ZrO ₂, SiO ₂, Al ₂O ₃, Al ₂O ₃-SiO ₂, TiO ₂-SiO ₂Or ZrO ₂-SiO ₂As oxide carrier A.In order to obtain sufficiently high proton conductive, wish to adopt ZrO ₂As oxide carrier A.On the other hand, for the manufacturing cost of the time control proton conductive inorganic oxide that obtains high proton conductivity, wish to adopt TiO ₂As oxide carrier A.Shape to oxide carrier A does not limit especially in the present invention.For example, oxide carrier A can be granular, fibrous, as writing board shape, stratiform or porous.

For oxide particle B is supported on the surface of oxide carrier A, wish to be dissolved with therein dispersal oxide carrier A in the solution (for example contain just like the aqueous solution of chloride, nitrate, hydracid, Oxonic Acid salt or the ethanolic solution of metal alkoxide) of element X (that is, being selected from least a element of W, Mo, Cr and V); Then, from solution, remove solvent to allow solute be supported on the surface of oxide carrier A; Subsequently, heat-treat, thereby acquisition is at the oxide particle B of the surperficial upper support of oxide carrier A.Certainly, the lip-deep method that makes oxide particle B be supported on oxide carrier A is not limited to said method.For example, the oxide particle B with the composite oxides form that contains multiple element can also be supported on the oxide carrier A surface.And, just enough by at least a portion surface support oxide particle B of oxide carrier A.For example, oxide particle B can intersperse on the surface of oxide carrier A or the layer structure on the surface of formation capping oxide carrier A.It is just enough to it shall yet further be noted that oxide particle B is supported on the surface of oxide carrier A, and the degree of crystallinity to oxide particle B or oxide carrier A is not particularly limited in the present invention.Yet, consider the formation that promotes lewis acid point, wish that oxide particle B and oxide carrier A are amorphous, can help the raising of acidity, the reduction of proton conductive inorganic oxide manufacturing cost, and made things convenient for manufacturing process.In addition, wish that more oxide particle B is an amorphous, oxide carrier A is crystallization.But it shall yet further be noted that oxide particle B and oxide carrier A can adopt crystal form, can also adopt the oxide particle B of crystal form and the oxide carrier A of amorphous form.

As mentioned above, the surface of proton conductive inorganic oxide provides the proton conductive zone, therefore, wishes that the specific area of proton conductive inorganic oxide is big as much as possible.Yet, wish that the specific area of proton conductive inorganic oxide drops on 10-2000m ²In the scope of/g.It should be noted that in specific area and surpass 2000m ²Under the situation of/g, be difficult to handle the distribution of proton conductive inorganic oxide and control proton conductive inorganic oxide particle.On the other hand, according to discussing in specific area less than 10m ²Under the situation of/g, be difficult to obtain enough proton conductives.

Element is element X contained in oxide particle B and the ratio of element Y contained in oxide carrier A than (X/Y).If element than X/Y less than 0.0001, too small in the amount of the oxide particle B of the surperficial upper support of oxide carrier A.In the case, can reduce the proton conductive zone, thereby reduce proton conductive.On the other hand, if element surpasses 20 than X/Y, just with on the surface that is supported on oxide carrier A excessively in a large number, oxide particle B has hidden the proton conductive zone to oxide particle B as a result, thereby has reduced proton conductive.In this case, wish that element X contained among the oxide particle B and the element of element Y contained in oxide carrier A drop on than (X/Y) in the scope of 0.0001-20, more wish in the scope of 0.01-1.

For example, can obtain the proton conductive inorganic oxide that adopts in the present invention in the following manner: oxide particle B is supported on the surface of oxide carrier A; Then under oxidizing atmosphere, for example under the air atmosphere resulting system is heat-treated.If heat treatment temperature is lower than 200 ℃, between oxide carrier A and oxide particle B, can not form enough chemical bonds, can reduce the proton conductive of resulting proton conductive inorganic oxide thus.On the other hand, if heat-treating above under 1000 ℃ the temperature, oxide particle fuses each other, has reduced the specific area of gained proton conductive inorganic oxide particle, can't obtain high proton conductivity.In this case, wish that heat treatment carries out more preferably 400-700 ℃ in 200-1000 ℃ temperature range.It shall yet further be noted that if heat-treat,, can not between oxide carrier A and oxide particle B, form chemical bond, need heat-treat for a long time because heat treatment temperature is low at 200 ℃.Yet, if heat treatment temperature rises to about 1000 ℃ temperature, between oxide carrier A and oxide particle B, be easy to form chemical bond, therefore can be by the synthetic proton conductive inorganic oxide of the heat treatment of short time.

Wish that proton conductive inorganic oxide has the solid peracidity.The proton extent of dissociation can be represented that the acidity of solid acid can be by Hammett acidity function H by acidity ₀Expression.Under the situation of sulfuric acid, H ₀Value be-11.93.Wish that more proton conductive inorganic oxide shows the solid peracidity, wherein, above-mentioned H ₀Value less than-11.93, that is, and H ₀＜-11.93.Can learn the solid peracidity of proton conductive inorganic oxide by measuring in conjunction with embodiments of the invention after this with the solid peracidity of the proton conductive membrane described.

Hope contains proton conductive inorganic oxide and polymeric material according to the proton conducting solid electrolyte of embodiment of the present invention.More wish proton conducting solid electrolyte is constructed such that proton conductive inorganic oxide is contained in the polymeric material or makes the proton conductive inorganic oxide particle by being bonded to each other as the polymeric material of adhesive.The polymeric material of Cai Yonging comprises for example polystyrene, polyether-ketone, polyether-ether-ketone, polysulfones, polyether sulfone and other engineering plastic materials in the present invention, although this polymeric material is not limited thereto.The polymeric material doping proton carrier of above-mentioned example perhaps can also be chemically bonded to proton carrier or be fixed on the polymeric material of above-mentioned example.In addition, can adopt the polymeric material that shows proton conductive, as perfluorinated sulfonic acid.Particularly, wish to adopt polyacrylonitrile (PAN) as polymeric material, because PAN shows high polarity.

In proton conducting solid electrolyte, wish that the mixing ratio of proton conductive inorganic oxide and polymeric material meets the following conditions: stop the liquid fuel infiltration; Keep high proton conductivity simultaneously.If the weight ratio (S/T) of the total weight of proton conductive inorganic oxide and this film (T) can reduce the continuity of proton conductive inorganic oxide less than 0.5, reduce conductivity thus.In this case, wish that above-mentioned weight ratio (S/T) drops in the scope of 0.5-0.999.

When proton conductive inorganic oxide during as the solid electrolyte of fuel cell, the proton conductive inorganic oxide that is adopted is normally with the form of film.Yet the proton conductive inorganic oxide that is adopted not necessarily must be the form with film.The proton conductive inorganic oxide of Cai Yonging can also be columniform in the present invention.Particularly, can adopt following method: with the method for the dispersed mixture of the form of film casting proton conductive inorganic oxide and polymeric material; Perhaps be applied to the casting method of porous core, textile fabric or adhesive-bonded fabric, above-mentioned porous core, textile fabric or adhesive-bonded fabric are marked with the mixture of above-mentioned dispersion.

The thickness of proton conductive solid electrolyte membrane is not particularly limited in the present invention.But consider the permeability and the proton conductive of mechanical strength, liquid fuel, wish that proton conductive solid electrolyte membrane has the thickness of at least 10 μ m, so that obtain to be applied to the film of practical use.And,, wish that proton conductive solid electrolyte membrane has the thickness that is not more than 300 μ m in order to reduce film resistance.Especially, wish that more proton conductive solid electrolyte membrane has the thickness in the 10-100 mu m range, so that reduce the internal resistance of fuel cell.

The method of thickness to the control proton conductive solid electrolyte membrane is not particularly limited in the present invention.For example, carry out under the situation of membranaceous casting at dispersed mixture proton conductive inorganic oxide and polymeric material, the casting amount of the dispersed mixture by control proton conductive inorganic oxide and polymeric material or by control casting area, thereby the thickness of controlling diaphragm.Can also be by adopting the thickness that reduces proton conductive solid electrolyte membrane as the hot pressing of hot press.

Describe electrode now in detail.

Electrode comprises proton conductive inorganic oxide, can be used as the fuel electrode or the oxidant electrode of fuel cell, or simultaneously as fuel electrode and oxidant electrode.

According to one embodiment of present invention, provide a kind of electrode, this electrode comprises catalyst layer, and this catalyst layer contains oxidation reduction catalyst, proton conductive inorganic oxide and as the polymeric material of adhesive.

Fuel electrode and oxidant electrode are formed by structure that can make gaseous diffusion such as loose structure respectively, and like this, fuel gas, liquid fuel or oxidizing gas just can be by fuel electrode and the circulations of oxidizing gas electrode.In order to promote that fuel electrode and oxidant electrode comprise catalyst layer respectively in the reduction reaction of the fuel oxidation on fuel electrode reaction and the oxygen on oxidant electrode, in catalyst layer, metallic catalyst is supported on electrically conductive carrier material for example on the carbon.The metallic catalyst of Cai Yonging comprises for example platinum, gold, silver, palladium, iridium, rhodium, ruthenium, iron, cobalt, nickel, chromium, tungsten, molybdenum, manganese and vanadium in the present invention.These metallic catalysts can use separately, perhaps use with the form of binary or ternary alloy three-partalloy.Especially, platinum shows high catalytic activity, therefore uses in many cases.The carrier material of support metal catalyst is the just enough of conduction.Material with carbon element is widely used as the carrier material of support metal catalyst.Material with carbon element as carrier material comprises for example carbon black such as furnace black, channel black and acetylene black and activated carbon and graphite.

Not restriction especially of method to metallic catalyst is supported by carbon support material in the present invention.For example, material with carbon element is dispersed in the solution that wherein is dissolved with the metallic element that forms metallic catalyst, for example, the aqueous solution of chloride, nitrate, hydracid or Oxonic Acid or the ethanolic solution of metal alkoxide; Then, remove solvent, so that solute is supported by carbon support material; Subsequently, under reducing atmosphere, carbon support material is heat-treated, thereby acquisition has the catalyst at the metallic catalyst of material with carbon element upper support.Metallic catalyst has the particle diameter that is generally 1-50nm, and the amount of catalyst metals is 0.01-10mg/cm in electrode ²

Proton conductive inorganic oxide particle contained in the catalyst layer that hope forms on fuel electrode and oxidant electrode has enough continuitys, and this is because the proton conductive inorganic oxide particle is provided for transmitting to dielectric film the path of proton.Can support proton conductive inorganic oxide by material with carbon element.And, in electrode, containing under the state of proton conductive inorganic oxide, the amount of the proton conductive inorganic oxide that hope is adopted is 0.01-50mg/cm ²

Polymeric material is as adhesive, so that the carbon support material of fixing metal catalyst or support metal catalyst and the proton conductive inorganic oxide on catalyst layer.In the present invention polymeric material is not particularly limited, for example comprises: polystyrene, polyether-ketone, polyether-ether-ketone, polysulfones, polyether sulfone and other engineering plastic materials.And polymeric material can be doped with proton carrier, for example sulfonic acid, phosphoric acid and other proton carrier.These proton carriers can also electrochemistry be bonded to or be fixed on the polymeric material.In addition, can adopt the polymeric material that shows proton conductive, for example, the polymeric material that forms by perfluorinated sulfonic acid.Owing to wish to form the porous catalyst layer that shows high proton conductivity and high electron conduction, therefore should be noted that the carbon support material of metallic catalyst, support metal catalyst and proton conductive inorganic oxide and the mixing ratio of polymeric material.Particularly, the weight ratio (P/C) of wishing the total amount of polymeric material P and catalyst layer C drops in the scope of 0.001-0.5.If weight ratio P/C is higher than 0.5, the contact area of proton conductive inorganic oxide and metallic catalyst diminishes, thereby has reduced proton conductive and electron conduction.

In the present invention the method that forms electrode is had no particular limits.For example, electrode can be formed by catalyst layer separately.Catalyst layer can also be formed on and also obtain electrode on another supporting member thus.For example, metallic catalyst, proton conductive inorganic oxide and polymeric material mixed and be dispersed in water or organic solvent such as the ethanol obtain slurry, then apply supporting member with the slurry that obtains, the slurry after oven dry and roasting apply subsequently forms catalyst layer thus.Supporting member is not particularly limited.For example, can adopt dielectric film to be formed on membrane electrode assembly on the dielectric film to obtain catalyst layer wherein as supporting member.As selection, can on the paper of making by the carbon that shows gas-premeable and electron conduction, felt or cloth, form catalyst layer, thereby obtain to be combined with the membrane electrode assembly of dielectric film.

According to the membrane electrode assembly of one embodiment of the present invention comprise fuel electrode, oxidant electrode and be inserted in fuel electrode and oxidant electrode between and contain the dielectric film of above-mentioned proton conducting solid electrolyte.The membrane electrode assembly of another execution mode comprises the electrode that contains aforementioned catalyst layer according to the present invention.In addition, the membrane electrode assembly of an execution mode had both comprised the electrode that contains aforementioned catalyst layer again according to the present invention, also comprised the dielectric film that contains aforementioned proton conducting solid electrolyte.

Utilization can be heated the device that also can exert pressure dielectric film and electrode are bonded to each other.Usually, hot press is used for dielectric film and electrode are bonded to each other.In this case, be not less than as the pressed temperature of the vitrification point of the polymeric material of the adhesive in electrode and the dielectric film just enough.Usually, pressed temperature is 100-400 ℃.On the other hand, the hardness according to the electrode that is adopted is generally 5-200kg/cm by the hot press applied pressure ²

The fuel cell that comprises according to membrane electrode assembly of the present invention is described referring now to accompanying drawing.Particularly, Fig. 1 represents the schematic cross-section of liquid fuel power pool structure according to an embodiment of the invention.As shown in the figure, fuel liquid battery comprises by the mode that a monocell is placed on another monocell and piles up the battery pile 100 that a plurality of monocells are made.Fuel is set on the side of battery pile 100 introduces passage 1.Liquid fuel is provided to fuel from the liquid-fuel tank (not shown) by the inlet tube (not shown) and introduces the passage 1.Each monocell comprises membrane electrode assembly 5, membrane electrode assembly 5 comprise fuel electrode 2 (being also referred to as anode), oxidant electrode 3 (being also referred to as negative electrode) and be inserted in fuel electrode 2 and oxidant electrode 3 between dielectric film 4.Fuel electrode 2 and oxidant electrode 3 need be formed by conductive porous body, so that fuel and oxidant gas are circulated by it.

Each monocell also comprises the fuel vaporization part 6 that is layered on the fuel electrode 2, be layered in the fuel infiltration part 7 on the fuel vaporization part 6 and be layered in cathode separator 8 on the oxidant electrode 3.Fuel infiltration part 7 plays the liquid fuel that passage 1 provides is introduced in maintenance by fuel effect.Fuel vaporization part 6 plays the effect of the evaporation section of the liquid fuel of being preserved by fuel infiltration part 7 being introduced fuel electrode 2.The oxidant gas groove supply 9 that flows through oxidant gas forms being arranged in the face of the continuous channel on the side of oxidant electrode 3 in cathode separator 8.Cathode separator 8 also plays the effect of the adjacent membrane electrode assembly 5 that is connected in series.

Point out in passing, making under the situation of battery pile 100 by piling up a plurality of monocells as shown in Figure 1, wish that cathode separator 8, fuel infiltration part 7 and fuel vaporization part 6 are formed by the porous conductor of carbon containing respectively, this is because above-mentioned these cathode separator 8 and part 6,7 also play the effect of the collector plate that is used to conduct the electronics that is produced.

As mentioned above, the dividing plate 8 that is comprised in monocell shown in Figure 1 also plays the effect of oxidizing gas from its path that flows through.Because dividing plate 8 also plays the effect of path, therefore can reduce the quantity of parts contained in fuel cell, can dwindle fuel cell.As selection, can adopt common path to substitute dividing plate 8.

By utilizing gravity is that the freely falling body method is fed to liquid fuel the liquid fuel passage 1 from fuel reservoir jar (not shown).In the method, liquid fuel can be incorporated into fuel and introduce in the passage 1, although the limitation here is and the fuel reservoir jar need be placed on the position of the upper surface that is higher than battery pile 100 under the situation that does not have failure.Can also utilize capillarity that liquid fuel is introduced liquid fuel from the fuel reservoir jar introduces the passage 1.Utilize in employing under the situation of capillary method, need between fuel reservoir jar and liquid fuel introducing passage 1, not connect, that is to say that liquid fuel within is introduced the fuel inlet that forms in the passage 1 and is arranged on the upper surface that is higher than battery pile 100.Therefore, the combination of capillary method and freely falling body method is favourable, and the installation site of tanks can at random be set.

But should note, be incorporated into the liquid fuel that liquid fuel introduces in the passage 1 by capillarity and further be incorporated in the fuel infiltration part 7 by capillarity, the capillarity that needs designing fuel cell to make to be used for liquid fuel is introduced fuel infiltration part 7 is bigger than the capillarity that is used for liquid fuel is introduced liquid fuel introducing passage 1.Point out that in passing liquid fuel is introduced passage 1 and is not limited to along the single liquid fuel passage 1 of the side extension of battery pile 100.Can also form another liquid fuel along the mode that extend the another side of battery pile 100 and introduce passage 1.

Above-mentioned fuel reservoir jar forms and can separate with battery main body.And by upgrading the fuel reservoir jar, fuel cell can long time continuous working.And, the capillarity sucking-off liquid fuel that liquid fuel can be configured to utilize the freely falling body of aforesaid liquid fuel or liquid fuel be extruded or introduced by liquid fuel passage 1 by the interior pressure of for example fuel reservoir jar from the mechanism that the fuel reservoir jar is fed to liquid fuel passage 1.

To be incorporated into liquid fuel by said method introduces the liquid fuel of passage 1 and offers fuel infiltration part 7.Type to fuel infiltration part 7 is not particularly limited, and makes fuel infiltration part 7 play in fuel infiltration part 7 liquid hold-up fuel as far as possible and the fuel of evaporation is fed to effect in the fuel electrode 2 by fuel vaporization part 6.For example, can make fuel infiltration part 7 comprise liquid fuel passage and the gas-liquid separating film that forms at the interface between fuel infiltration part 7 and fuel vaporization part 6.In addition, do not utilizing optional equipment but utilize capillarity liquid fuel to be supplied under the situation of fuel infiltration part 7, the type of fuel infiltration part 7 is being not particularly limited, liquid fuel is permeated by capillarity.In order to produce capillarity, can adopt porous body for example particle or filler, the adhesive-bonded fabric of making by papermaking process, by the textile fabric of braided fiber preparation and between the glass plate or the small gap that forms between the plastic plate.

As mentioned above, utilize porous body to form fuel infiltration part 7.In the case, be used for comprising the capillarity that the porous body by fuel infiltration part 7 produces to the capillarity that fuel infiltration part 7 is introduced liquid fuels.Utilizing under the capillary situation, the hole of porous fuel permeate portion 7 interconnects so-called to form " open bore ", and controls the diameter of this open bore.And, make described open bore extend to the another side that arrives fuel infiltration part 7 at least from the side of introducing the fuel infiltration part 7 of passage 1 towards liquid fuel, can utilize capillarity that liquid fuel is provided in the horizontal swimmingly thus.

The aperture of the porous body that is used to form fuel infiltration part 7 etc. is not particularly limited, makes the hole can imbitition fuel introduce liquid fuel in the passage 1 as far as possible.Yet, consider by liquid fuel and introduce the capillarity that passage 1 produces that the aperture that hope will be used to form the porous body of fuel infiltration part 7 is made as about 0.01-150 μ m.And, wish that the volume settings with the hole is about 20-90%, the volume in hole is the index that the continuity according to the porous body mesopore provides.The aperture is difficult to prepare fuel infiltration part 7 during less than 0.01 μ m.On the other hand, if the aperture surpasses 150 μ m, the capillarity that is produced by the porous body that forms fuel infiltration part 7 can descend.In addition, if pore volume less than 20%, the quantity of open bore descends, thereby has increased the quantity of blind hole, therefore is difficult to obtain enough capillarities.If but pore volume surpasses 90%, although certainly increase the quantity of open bore, the mechanical strength of fuel infiltration part descends.In fact, the porous body of wishing to be used to form the fuel infiltration part has and drops on the aperture in the 0.5-100 mu m range and drop on pore volume in the 30-75% scope.

In the fuel cell of said structure, even at room temperature also cell reaction can take place.But wish that fuel cell works under 50-150 ℃ high temperature, this is because improved the catalytic activity of electrode, has reduced the overvoltage of electrode.And, produce proton conductive fully in order to make dielectric film, wish that fuel cell operates under the temperature that can easily carry out water management.Particularly, wish that fuel cell working in the temperature range of room temperature to 150 ℃.

Another kind of proton conductive membrane is described now.

This proton conductive membrane comprises: the proton conductive inorganic oxide that shows the solid peracidity; With the hydrophilic polymer material that contains at least a hydrophilic radical that is selected from hydroxyl, carboxyl, ehter bond and amido link.

The proton conductive inorganic oxide that shows the solid peracidity for example comprises, the solid acid that is made of the metal oxide as disclosed support sulfuric acid among the TOHKEMY 2002-216537 that quotes previously; Comprise oxide carrier and the proton conductive inorganic oxide that is supported on the lip-deep proton conductive inorganic oxide particle of oxide carrier, oxide carrier contains the element Y that is made of at least a element that is selected from Ti, Zr, Si and Al, oxide particle contains the element X that is made of at least a element that is selected from W, Mo, Cr and V, (below be called the proton conductive inorganic oxide that contains element X and Y).

Under the situation of the metal oxide that supports sulfuric acid, produce proton conductive by the sulfate radical that is solidificated on the metal oxide surface.Yet sulfate radical is easy to be decomposed by hydrolysis.Should note in this, in the process that produces electric energy, in fuel cell, produce water.Therefore, if the metal oxide of support sulfuric acid is used as the proton conductive membrane in the fuel cell that utilizes liquid fuel, proton conductive can reduce.

On the other hand, the proton conductive mechanism in the proton conductive inorganic oxide that contains element X and Y is not also understood fully.But think that a kind of rational understanding is, because containing the oxide particle of element X is that oxide particle B is supported on the surface that the oxide carrier that contains element Y is oxide carrier A, in the structure of oxide particle B, formed the lewis acid point, aquation by lewis acid point has formed the Bronsted acid point, forms the proton conduction zone thus.Another kind is reasonably understood, and proton conductive inorganic oxide has non crystalline structure, and non crystalline structure helps lend some impetus to the formation of lewis acid point equally.

It shall yet further be noted that except the proton that is undertaken by the lewis acid point forms reaction, also can reduce the molecular amounts of the required water entrainment of proton conductive, can obtain high proton conductivity with the low amounts of water molecule that on the surface of proton conductive inorganic oxide, exists.In this case, need not carry out strict water management at power generating stage.

Yet the water absorbing capacity of proton conductive membrane that contains proton conductive inorganic oxide is poor, can't provide sufficient water to satisfy the needs that produce proton to the solid peracid.Therefore the resistance of film presents higherly a little.And, under the situation of the fuel cell that adopts liquid fuel such as methyl alcohol, can not fully control the stream of striding of methyl alcohol, can't obtain stable output.

After having carried out extensive studies, the inventor finds, thereby the mode that can improve the dispersibility of proton conductive inorganic oxide particle by the hydrophilic polymer material that proton conductive membrane is comprised contain at least a functional group that is selected from hydroxyl, carboxyl, ehter bond and amido link is suppressed at being separated between proton conductive inorganic oxide and the hydrophilic polymer material.Because thus obtained proton conductive membrane shows high water absorbing capacity, can provide enough a large amount of water to proton conductive inorganic oxide, therefore, can obtain high proton conductivity and reduce film resistance.It shall yet further be noted that because proton conductive membrane has high density, therefore can suppress the infiltration of liquid fuel, suppress the stream of striding of methyl alcohol.

In the case, by adopting proton conductive membrane, improved the maximum power density of fuel cell as dielectric film or by allowing fuel electrode and/or oxidant electrode contain proton conductive inorganic oxide and hydrophilic polymer material.

As mentioned above, in proton conductive membrane, contain proton conductive inorganic oxide and hydrophilic polymer material.Can select the proton conductive inorganic oxide of proton conductive membrane, this proton conductive inorganic oxide contains above-mentioned element X and Y.

Hydrophilic polymer material contained in proton conductive membrane contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link in its molecular structure.

Wishing that proton conductive membrane is constituted as makes proton conductive inorganic oxide be included in the polymeric material or is attached to hydrophilic polymer material.Exist from the teeth outwards under the situation of water, solid superacid plays the effect of proton conductor.If hydrophilic polymer material is elected to be the polymeric material that covers solid superacid or have connected solid superacid, then can provides enough a large amount of water, thereby obtain showing the proton conductive membrane of high proton conductivity to solid superacid.

Hydrophilic polymer material has at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.Hydrophilic polymer material with hydroxyl comprises for example polyvinyl alcohol.Hydrophilic polymer material with carboxyl comprises for example polyacrylic acid.Hydrophilic polymer material with ehter bond comprises for example polyethylene glycol and cellulose.In addition, the hydrophilic polymer material with amido link comprises for example polyamide and polyvinylpyrrolidone.Can also adopt organic polymer material as hydrophilic polymer material with ester bond.

Particularly, adopting under the situation of polyvinyl alcohol as hydrophilic polymer material, increasing, thereby improving the dispersibility of proton conductive inorganic oxide particle with the affinity of proton conductive inorganic oxide.Can also be suppressed at being separated between proton conductive inorganic oxide and the hydrophilic polymer material.Can obtain the strong proton conductive membrane that also can suppress methanol crossover of water absorbing capacity thus.

The saponification value of wishing polyvinyl alcohol is 50%-100%.If saponification value is lower than 50%, can reduce the water absorption of film, increase the resistance of proton conductive membrane.On the other hand, if saponification value in the scope of 50-100%, can reduce the resistance of proton conductive membrane, although, may improve methanol permeation along with the absorptive raising of proton conductive membrane.Can measure saponification value as follows.Particularly, polyvinyl alcohol is used basic matterial such as NaOH saponification fully.Confirm whether to realize fully saponification by infrared absorption analysis.In addition, determine saponification value from the amount of the acetate that obtains by saponification.

Wish that the water absorbent polymer material has at least 5% equilibrium water conten absorptivity being not less than under 20 ℃ the temperature.The hydrophilic polymer material that reaches this requirement shows high water absorbing capacity, therefore, has further reduced the resistance of proton conductive membrane.Wish that more hydrophilic polymer material has the equilibrium water conten absorptivity of 5-95% under 20-90 ℃ temperature.

Point out in passing, obtain the equilibrium water conten absorptivity by following manner: at first, with sample film have be set at 20 ℃ or higher steady temperature, be set at 95% or the environment of higher constant relative humidity under place a week, so that the moisture absorption amount reaches poised state, measure the weight of this sample film; Then, sample is dried the 2 hours weight of measuring samples film afterwards down at 105 ℃.Very natural, be that the basis obtains the balance absorptivity with sample film before baking stage and the weight difference between the sample film after the baking stage.Point out that in passing hydrophilic polymer material is dissolved in the water obtains slurry, the resulting slurry of casting is made sample film thus.

The mixing ratio of wishing hydrophilic polymer material and proton conductive inorganic oxide meets the following conditions: prevent the infiltration of liquid fuel; Keep high proton conductivity simultaneously.If proton conductive inorganic oxide (S) is lower than 0.1 with the weight ratio (S/T) of film total amount (T), can reduces the continuity of proton conductive inorganic oxide, thereby reduce conductivity.In the case, wish that above-mentioned weight ratio (S/T) drops in the scope of 0.1-0.999.

Can make proton conductive membrane in the following manner: for example, at first, proton conductive inorganic oxide particle and hydrophilic polymer are dispersed in polar solvent such as water or the ethanol, make slurry; Then, slurry is cast on glass substrate or the resin substrate; Remove solvent by oven dry subsequently and baked film is heat-treated not being higher than under 200 ℃ the temperature.The mechanism of action that is played by heat treatment also imperfectly understands now.Yet, think that a kind of rational understanding is, by having caused oxidation reaction and the interaction of dehydration and hydrogen bond and the crystallization of hydrophilic polymer material between proton conductive inorganic oxide and hydrophilic polymer material not being higher than the above-mentioned heat treatment of carrying out under 200 ℃ the temperature, thereby the expansion and the dissolving of hydrophilic polymer material have been prevented.Infrared spectrum analysis (IR) result has advised following at least situation: by heat-treating not being higher than under 200 ℃ the temperature, by solid superacid being converted into the hydrophily ketone group, oxidized hydrophily hydroxyl in polyvinyl alcohol.

If by adopting the slurry of polyvinyl alcohol by method for preparing and carrying out above-mentioned heat treatment and make proton conductive membrane, just can under situation about not weakening with the affinity of proton conductive inorganic oxide, suitably reduce the solubility of the polyvinyl alcohol in polar solvent such as the water, can make proton conductive membrane keep its shape thus, make slurry keep good dispersion stabilization simultaneously in the suction stage.The effective proton conductive membrane of a kind of water absorbing capacity excellence, inhibition methanol crossover can be provided thus.And, owing to carry out the film that above-mentioned heat treatment can obtain to keep the ability excellence of its shape, even and also be water so during the solvent during as the preparation slurry, therefore use water as the hydrophilic ability that solvent has further improved film.

Need under the temperature that hydrophilic polymer material is decomposed or destroys, heat-treat.Particularly, wish to heat-treat not being higher than under 200 ℃ the temperature.And, fully play effect in order to make heat treatment, wish heat treatment temperature is set at 100 ℃ or higher.Wish that more heat treatment temperature is in 130-180 ℃ scope.

Under the situation of proton conductive membrane as the solid electrolyte film in the fuel cell, proton conductive membrane adopts sheet usually.Yet the proton conductive membrane that is adopted not necessarily must be with sheet form.For example, proton conducting inorganic material can also be molded into columniform.Particularly, can adopt following method: the dispersed mixture direct pouring of proton conductive inorganic oxide and hydrophilic polymer material is become membranaceous casting method; Perhaps adopt and utilize the casting method that injects, wherein, porous core, textile fabric or adhesive-bonded fabric are injected above-mentioned dispersed mixture.

Thickness to proton conductive solid electrolyte membrane is not particularly limited in the present invention.But consider the permeability and the proton conductive of mechanical strength, liquid fuel, wish that proton conductive solid electrolyte membrane has the thickness of at least 10 μ m, so that obtain to be applied to the film of practical use.And,, wish that proton conductive solid electrolyte membrane has the thickness that is not more than 300 μ m in order to reduce film resistance.Especially, in order to reduce the internal resistance of fuel cell, wish that more proton conductive solid electrolyte membrane has the thickness in the 10-100 mu m range.

The method of thickness to the control proton conductive solid electrolyte membrane is not particularly limited in the present invention.For example, carry out under the situation of membranaceous casting at dispersed mixture proton conductive inorganic oxide and hydrophilic polymer material, the casting amount of the dispersed mixture by control proton conductive inorganic oxide and polymeric material or by control casting area, thereby the thickness of controlling diaphragm.Can also be by adopting the thickness that reduces proton conductive solid electrolyte membrane as the hot pressing of hot press.

Now, describe electrode in detail.

Electrode comprises the proton conductive inorganic oxide that shows the solid peracidity and has the hydrophilic polymer material of at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.This special electrodes can be used as fuel electrode or oxidant electrode, or simultaneously as fuel electrode and oxidant electrode.

Electrode according to one embodiment of the present invention comprises catalyst layer, and this catalyst layer contains oxidation reduction catalyst, proton conductive inorganic oxide and is used as the hydrophilic polymer material of adhesive.

Fuel electrode and oxidant electrode are formed by structure that can make gaseous diffusion such as loose structure respectively, and like this, fuel gas, liquid fuel or oxidizing gas just can be by fuel electrode and the circulations of oxidizing gas electrode.In order to promote that fuel electrode and oxidant electrode comprise catalyst layer respectively in the reduction reaction of the fuel oxidation on fuel electrode reaction and the oxygen on oxidant electrode, in catalyst layer, metallic catalyst is supported on electrically conductive carrier material for example on the carbon.Metallic catalyst comprises for example platinum, gold, silver, palladium, iridium, rhodium, ruthenium, iron, cobalt, nickel, chromium, tungsten, molybdenum, manganese and vanadium.These metallic catalysts can use separately, perhaps use with the form of binary or ternary alloy three-partalloy.Especially, platinum shows high catalytic activity, therefore uses in many cases.The carrier material of support metal catalyst is the just enough of conduction.Material with carbon element is widely used as the carrier material of support metal catalyst.Material with carbon element as carrier material comprises for example carbon black such as furnace black, channel black and acetylene black and activated carbon and graphite.

Contained proton conductive inorganic oxide has enough contacts area in the catalyst layer that hope forms on fuel electrode and oxidant electrode, and this is because proton conductive inorganic oxide is provided for transmitting to dielectric film the path of proton.Can support proton conductive inorganic oxide by material with carbon element.And, in electrode, containing under the state of proton conductive inorganic oxide, the amount of the proton conductive inorganic oxide that hope is adopted is 0.01-50mg/cm ²

Hydrophilic polymer material is as adhesive, so that the carbon support material of fixing metal catalyst or support metal catalyst and the proton conductive inorganic oxide on catalyst layer.In the present invention hydrophilic polymer material is not particularly limited, comprises those that front is for example introduced in conjunction with the description of proton conductive membrane.Owing to wish to form the porous catalyst layer that shows high proton conductivity and high electron conduction, therefore should be noted that the mixing ratio of the carbon support material of hydrophilic polymer material and metallic catalyst or support metal catalyst and proton conductive inorganic oxide.Particularly, the weight ratio (P/C) of wishing the total amount of polymeric material P and catalyst layer C drops in the scope of 0.001-0.5.If weight ratio P/C is higher than 0.5, the interaction between proton conductive inorganic oxide and the metallic catalyst diminishes, thereby has reduced proton conductive and electron conduction.

Electrode can be formed by catalyst layer separately.As selection, catalyst layer can also be formed on and also obtain electrode on another carrier thus.In the present invention the method for preparing electrode is not particularly limited.For example, metallic catalyst, proton conductive inorganic oxide and hydrophilic polymer material mixed and be dispersed in organic solvent such as water and the ethanol obtain slurry, then apply supporting member with the slurry that obtains, the slurry after oven dry and roasting apply subsequently forms catalyst layer thus.Supporting member is not particularly limited.For example, can adopt dielectric film to be formed on membrane electrode assembly on the dielectric film to obtain catalyst layer wherein as supporting member.As selection, can on the paper of making by the carbon that shows gas-premeable and electron conduction, felt or cloth, form catalyst layer, thereby obtain to be combined with the membrane electrode assembly of dielectric film.

According to the membrane electrode assembly of one embodiment of the present invention comprise fuel electrode, oxidant electrode and be inserted in fuel electrode and oxidant electrode between and contain the dielectric film of above-mentioned proton conductive membrane.And, another execution mode according to the present invention, fuel electrode and/or oxidant electrode comprise aforementioned catalyst layer.In addition, the execution mode again according to the present invention, fuel electrode and/or oxidant electrode comprise aforementioned catalyst layer, dielectric film comprises aforementioned proton conductive membrane.

Utilization can be heated the device that also can exert pressure dielectric film and electrode are bonded to each other.Usually, hot press is used for dielectric film and electrode are bonded to each other.In this case, be not less than as the pressed temperature of the vitrification point of the hydrophilic polymer material of the adhesive in electrode and the dielectric film just enough.Usually, pressed temperature is 100-400 ℃.On the other hand, the hardness according to the electrode that is adopted is generally 5-200kg/cm by the hot press applied pressure ²

Comprise that the fuel cell of membrane electrode assembly constitutes as illustrated in fig. 1 and 2 according to an embodiment of the invention.

Describe the present invention in detail referring now to embodiments of the invention.Certainly, technical scope of the present invention is not limited to following examples.

[embodiment 1]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 2g vanadium chloride VCl ₃300ml distilled water in the mixed solution made be heated to 80 ℃, stir this solution simultaneously and remove water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition (heating rate) with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the vanadium oxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the v element X in vanadium oxide and the silicon dioxide is 0.1 than X/Y, and has the specific area shown in the table 1.The proton conductive inorganic oxide powder that is formed by the vanadium oxide that is supported by silicon dioxide is carried out X-ray diffraction measure, found that viewed all diffraction maximums all are derived from silicon dioxide, illustrate that vanadium oxide has non crystalline structure.

Point out in passing, measure the element of proton conductive inorganic oxide powder than X/Y and specific area by following method.

Than X/Y, measure specific area by energy dissipation type x-ray analysis (EDX), the sub-spectrum of X-ray photoelectric (XPS) or atomic absorption light spectrometry element by the BET method.

The proton conductive inorganic oxide powder that 1g is heavy joins the N that 2g contains 5% polyacrylonitrile (PAN), in N-dimethylacetylamide (DMAc) solution, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into by the petri diss that tetrafluoroethene-perfluorinated alkoxy vinyl ether copolymer (PFA) is made, under air atmosphere, dried slurries with 60 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of total film amount T are 0.9, the thickness of dielectric film is 150 μ m.

[embodiment 2]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 3g chromium chloride hexahydrate CrCl ₃6H ₂The mixed solution for preparing in the 300ml distilled water of O joins 80 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the chromium dioxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the chromium element X in chromium oxide and the silicon dioxide is 0.1 than X/Y, and has the specific area shown in the table 1.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the DMAc solution of 5%PAN, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into the petri diss of being made by the PFA resin, under air atmosphere, dry slurries with 60 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of total film amount T are 0.9, the thickness of dielectric film is 151 μ m.

[embodiment 3]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 2g ammonium molybdate (NH ₄) ₆Mo ₇O ₂₄4H ₂The mixed solution of making in the 300ml distilled water of O is heated to 80 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the molybdenum dioxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the molybdenum element X in molybdenum oxide and the silicon dioxide is 0.1 than X/Y, and has the specific area shown in the table 1.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the DMAc solution of 5%PAN, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into the petri diss of being made by the PFA resin, under air atmosphere, dry slurries with 60 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of total film amount T are 0.9, the thickness of dielectric film is 152 μ m.

[embodiment 4]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 3g sodium tungstate dihydrate NaWO ₄2H ₂The mixed solution of making in the 300ml distilled water of O and the 150ml 0.1N aqueous solution of nitric acid is heated to 180 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Thus obtained dusty material is dispersed in the 100ml 0.1N aqueous solution of nitric acid, then carries out suction strainer, remove unwanted sodium ion.The solid constituent that obtains behind the suction strainer is placed 6 hours with except that anhydrating with 100 ℃ in drying unit, then utilize agate mortar to grind residue, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the tungsten dioxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the W elements X in tungsten oxide and the silicon dioxide is 0.1 than X/Y.

[embodiment 5]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the vanadium oxide powder of oxidized titanium support.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the v element X in vanadium oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 152 μ m.

[embodiment 6]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the chromium oxide powder of oxidized titanium support.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the chromium element X in chromium oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[embodiment 7]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the molybdenum oxide powder of oxidized titanium support.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the molybdenum element X in molybdenum oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 8]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the tungsten oxide powder of oxidized titanium support.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the W elements X in tungsten oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 9]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the vanadium oxide powder of oxidized zirconium support.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the v element X in vanadium oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 148 μ m.

[embodiment 10]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 2 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 2, obtain the proton conductive inorganic oxide powder, that is the chromium oxide powder of oxidized zirconium support.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the chromium element X in chromium oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 11]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 3 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 3, obtain the proton conductive inorganic oxide powder, that is the molybdenum oxide powder of oxidized zirconium support.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the molybdenum element X in molybdenum oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 152 μ m.

[embodiment 12]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 4 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 4, obtain the proton conductive inorganic oxide powder, that is the tungsten oxide powder of oxidized zirconium support.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the W elements X in tungsten oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[embodiment 13]

Except using 16g zirconia-silica composite oxide (ZrSiO ₄) replace adopting among the embodiment 1 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the composite oxide power that constitutes of the vanadium oxide that supports by oxidized zirconium-silica composite oxide.In thus obtained proton conductive inorganic oxide powder, zirconium in the v element X of vanadium oxide and zirconia-silica composite oxide and the element of element silicon Y are 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[embodiment 14]

Except using 16g zirconia-silica composite oxide (ZrSiO ₄) replace adopting among the embodiment 2 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 2, obtain the proton conductive inorganic oxide powder, that is the composite oxide power that constitutes of the chromium oxide that supports by oxidized zirconium-silica composite oxide.In thus obtained proton conductive inorganic oxide powder, zirconium in the chromium element X of chromium oxide and zirconia-silica composite oxide and the element of element silicon Y are 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[embodiment 15]

Except using 16g zirconia-silica composite oxide (ZrSiO ₄) replace adopting among the embodiment 3 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 3, obtain the proton conductive inorganic oxide powder, that is the composite oxide power that constitutes of the molybdenum oxide that supports by oxidized zirconium-silica composite oxide.In thus obtained proton conductive inorganic oxide powder, zirconium in the molybdenum element X of molybdenum oxide and zirconia-silica composite oxide and the element of element silicon Y are 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[embodiment 16]

Except using 16g zirconia-silica composite oxide (ZrSiO ₄) replace as embodiment 4, obtaining the proton conductive inorganic oxide powder outside the 5g silicon dioxide of employing among the embodiment 4, that is, and the composite oxide power that the tungsten oxide that is supported by oxidized zirconium-silica composite oxide constitutes.In thus obtained proton conductive inorganic oxide powder, zirconium in the W elements X of tungsten oxide and zirconia-silica composite oxide and the element of element silicon Y are 0.1 than X/Y.

[embodiment 17]

Except 5% the DMAc solution of the PAN that replaces with the 5%DMAc solution that contains 5% polybenzimidazoles (PBI) adopting among the embodiment 1, as embodiment 1, obtain proton conductive inorganic oxide-PBI composite electrolyte membrane.In this proton conductive inorganic oxide powder, be 0.1 than X/Y at the element of the v element X of vanadium oxide and titanium elements Y in titanium oxide.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide-PBI composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 18]

Except 5% the DMAc solution of the PAN that replaces with 5% polystyrene (PS) chloroformic solution adopting among the embodiment 1, as embodiment 1, obtain proton conductive inorganic oxide-PS composite electrolyte membrane.In this proton conductive inorganic oxide powder, be 0.1 than X/Y at the element of the v element X of vanadium oxide and titanium elements Y in titanium oxide.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide-PS composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[embodiment 19]

Except using 17g tetraethoxysilane (Si (OH ₅) C ₂) ₄The 5g silicon dioxide that replaces adopting among the embodiment 1, then adopt thus obtained proton conductive inorganic oxide powder to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the proton conductive inorganic oxide powder, that is the vanadium oxide powder that is supported by silicon dioxide.In thus obtained proton conductive inorganic oxide powder, the element of the element silicon Y in the v element X in vanadium oxide and the silicon dioxide is 0.1 than X/Y.This proton conductive inorganic oxide is carried out X-ray diffraction measure, the result does not observe diffraction maximum, shows that vanadium oxide and silica are non crystalline structure.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[Comparative Examples 1]

The metal oxide of disclosed support sulfuric acid in the patent documentation 1 that preparation is quoted in front.Particularly, distilled water is added in the 6g concentrated sulfuric acid (96%), make the 100g aqueous sulfuric acid.Then, with 20g zirconia (ZrO ₂) add in the aqueous sulfuric acid and to the gained system and stirred 3 hours, make slurry.This slurry is heated to 100 ℃ with 5 ℃/minute the rate of heat addition from room temperature.Slurry after the heating placed down at 100 ℃ anhydrated from slurry, to remove in 3 hours.Then, slurry further is heated to 200 ℃, slurry was kept 3 hours at 200 ℃, obtain the white powder material with 1 ℃/minute the rate of heat addition.Thus obtained white powder material further is heated to 500 ℃ with 1 ℃/minute the rate of heat addition, dusty material after will heating then kept 3 hours with 500 ℃, thereby obtain the white powder of the proton conductive inorganic oxide that forms by the zirconia that supports sulfuric acid, that is, and SO ₄/ ZrO ₂Contained element sulphur S is 0.03 with the element of metallic element M contained in hydroxide carrier and/or oxide carrier than S/M in sulfuric acid.In addition, obtained the such proton conductive inorganic oxide material-PAN composite electrolyte membrane of embodiment 1.Proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PAN composite electrolyte membrane are 0.9, and the thickness of composite electrolyte membrane is 155 μ m.

[Comparative Examples 2]

NAFION 117 films that preparation is made by E.I.Du Pont Company are as dielectric film.

When water being added in the proton conductive membrane for preparing in embodiment 1-19 and the Comparative Examples 1, the slightly microdilatancy of this proton conductive membrane makes this proton conductive membrane peel off from the petri diss of being made by the PFA resin easily.Find in the case, this film is flexible, when passing through by m-nitrotoleune (pKa=-11.99), p-nitro fluorobenzene (pKa=-12.40), p-nitro-chlorobenzene (pKa=-12.70), m-nitro-chlorobenzene (pKa=-13.16), 2,4-dinitrotoluene (DNT) (pKa=-13.75) and 2, the acidity indicating gage that 4-dinitrofluorobenzene (pKa=-14.52) constitutes show the solid peracidity when measuring.Table 1 is also represented the Hammett acidity function H of each proton conductive membrane ₀

On the other hand, be used for making proton conductive membrane to expand the required water yield greater than making the required water yield of proton conductive membrane expansion that in each embodiment, prepares in Comparative Examples 2 preparations.

And, utilize the dielectric film of preparation in embodiment 1-19 and Comparative Examples 1 and 2 to assemble fuel liquid battery as follows.

Particularly, be marked with 5%NAFION solution, make oxidant electrode 3 thus by making the electrode (catalytic amount: Pt4mg/cm2 is made by E-tek company) that contains cathod catalyst and support platinum.And, contain the electrode (catalytic amount: Pt-Ru 4mg/cm that anode catalyst supports the platinum ruthenium by making ², make by E-tek company) and be marked with 5%NAFION solution, make fuel electrode 2 thus.

Then, prepare membrane electrode assembly 5: proton conductive membrane 4 is arranged between fuel electrode 2 and the oxidant electrode 3, at 100kg/cm by following mode ²Pressure under, with 120 ℃ resulting structures was implemented hot pressing bonding 5 minutes, obtain membrane electrode assembly thus.

In next step, the porous carbon sheet of the stacked evaporation section 6 that acts as a fuel on the fuel electrode 2 of thus obtained membrane electrode assembly 5, this porous carbon sheet has the average pore size of 100 μ m and 70% porosity.In addition, be provided as the porous carbon sheet of fuel infiltration part 7 on fuel vaporization part 6, this porous carbon sheet has the average pore size of 5 μ m and 40% porosity.Have again, in the space that between the support 11 of the support 10 of oxidant electrode and fuel electrode, limits resulting structures is set, obtain monocell shown in Figure 2 thus.Above-mentioned support 10 is equipped with the groove 9 that is used to supply oxidant gas.The response area of monocell is 10 square centimeters, and the groove 9 that being used to of forming in oxidant support 10 supplied oxidant gas has the degree of depth of 2mm and the width of 1mm.

Utilize capillarity to introduce thus obtained fuel liquid battery from the side of fuel infiltration part 7 as 20% methanol aqueous solution of liquid fuel.On the other hand, make with 1atm and flow through gas passage 9 with the flow velocity of 100ml/min, thereby realize generating as the air of oxidant gas.Carbon dioxide (the CO that will produce according to electric power generation reaction ₂) be discharged into the outside by fuel vaporization part 6 shown in Figure 2.Table 1 is also represented maximum power density.

Table 1 also illustrates about the methanol permeability of the proton conductive membrane of each embodiment and Comparative Examples and the measurement result of film resistance.It should be noted that being made as 1 respectively with the methanol permeability of NAFION 117 films of Comparative Examples 2 and film resistance is prerequisite, has provided the relative value of methanol permeability and film resistance respectively in the table 1.

Point out that in passing in order to measure methanol permeability, the proton conductive membrane that will have 10 square centimeters area inserts in the battery, and battery is divided into two parts.Then, 10% methanol aqueous solution is injected one of two batteries parts of separating, and pure water is injected another battery part, the temperature of this system is remained on room temperature.After the scheduled time, measure the split cell methanol concentration partly that has injected pure water therein, obtain methanol permeation by gas chromatography.Proton conductive membrane was immersed in the water 16 hours,, measure methanol permeation from film, removing the back of anhydrating so that this film can be used as dielectric film.

And, by the resistance of four terminal DC methods measurement film.Particularly, proton conductive membrane is inserted between two batteries of the area that has 10 square centimeters respectively.Then, 10% aqueous sulfuric acid is injected each battery.With this understanding, allow the DC electric current at room temperature flow through aqueous sulfuric acid, measure the voltage drop that existence or shortage by proton conductive membrane cause, measure conductivity thus.

Table 1

	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Specific area (m ²/g)	Acid function H ₀	Polymeric material	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during the methanol aqueous solution of employing 20% ²)
	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Specific area (m ²/g)	Acid function H ₀	Polymeric material	Relative methanol permeability	Relative film resistance		Embodiment 1	V	SiO ₂	0.1	50	- 11.99	PAN	0.6	1.5	10
Embodiment 2	Cr	SiO ₂	0.1	52	11.99	PAN	0.5	1.4	11	Embodiment 1	V	SiO ₂	0.1	50	- 11.99	PAN	0.6	1.5	10
Embodiment 2	Cr	SiO ₂	0.1	52	11.99	PAN	0.5	1.4	11	Embodiment 3	Mo	SiO ₂	0.1	50	-12.40	PAN	0.5	1.3	12
Embodiment 4	W	SiO ₂	0.1	50	-12.40	PAN	0.5	1.3	12	Embodiment 3	Mo	SiO ₂	0.1	50	-12.40	PAN	0.5	1.3	12
Embodiment 4	W	SiO ₂	0.1	50	-12.40	PAN	0.5	1.3	12	Embodiment 5	V	TiO ₂	0.1	55	-12.70	PAN	0.5	1.4	14
Embodiment 6	Cr	TiO ₂	0.1	53	-12.70	PAN	0.4	1.4	15	Embodiment 5	V	TiO ₂	0.1	55	-12.70	PAN	0.5	1.4	14
Embodiment 6	Cr	TiO ₂	0.1	53	-12.70	PAN	0.4	1.4	15	Embodiment 7	Mo	TiO ₂	0.1	49	-13.16	PAN	0.4	1.3	17
Embodiment 8	W	TiO ₂	0.1	55	-13.16	PAN	0.3	1.3	18	Embodiment 7	Mo	TiO ₂	0.1	49	-13.16	PAN	0.4	1.3	17
Embodiment 8	W	TiO ₂	0.1	55	-13.16	PAN	0.3	1.3	18	Embodiment 9	V	ZrO ₂	0.1	50	-13.75	PAN	0.2	1.2	20
Embodiment 10	Cr	ZrO ₂	0.1	50	-13.75	PAN	0.3	1.1	23	Embodiment 9	V	ZrO ₂	0.1	50	-13.75	PAN	0.2	1.2	20
Embodiment 10	Cr	ZrO ₂	0.1	50	-13.75	PAN	0.3	1.1	23	Embodiment 11	Mo	ZrO ₂	0.1	54	-14.50	PAN	0.2	1.2	24
Embodiment 12	W	ZrO ₂	0.1	53	-14.50	PAN	0.2	1.1	26	Embodiment 11	Mo	ZrO ₂	0.1	54	-14.50	PAN	0.2	1.2	24
Embodiment 12	W	ZrO ₂	0.1	53	-14.50	PAN	0.2	1.1	26	Embodiment 13	V	ZrSiO ₄	0.1	55	-13.16	PAN	0.4	1.3	14
Embodiment 14	Cr	ZrSiO ₄	0.1	50	-13.16	PAN	0.3	1.2	15	Embodiment 13	V	ZrSiO ₄	0.1	55	-13.16	PAN	0.4	1.3	14
Embodiment 14	Cr	ZrSiO ₄	0.1	50	-13.16	PAN	0.3	1.2	15	Embodiment 15	Mo	ZrSiO ₄	0.1	54	-13.75	PAN	0.4	1.3	14
Embodiment 16	W	ZrSiO ₄	0.1	51	-13.75	PAN	0.3	1.1	18	Embodiment 15	Mo	ZrSiO ₄	0.1	54	-13.75	PAN	0.4	1.3	14
Embodiment 16	W	ZrSiO ₄	0.1	51	-13.75	PAN	0.3	1.1	18	Embodiment 17	V	TiO ₂	0.1	53	-12.70	PBI	0.5	1.4	12
Embodiment 18	V	TiO ₂	0.1	52	-12.70	PS	0.4	1.3	13	Embodiment 17	V	TiO ₂	0.1	53	-12.70	PBI	0.5	1.4	12
Embodiment 18	V	TiO ₂	0.1	52	-12.70	PS	0.4	1.3	13	Embodiment 19	V	SiO ₂	0.1	51	-12.40	PAN	0.6	1.2	13
Comparative Examples 1	-	SO ₄/ZrO ₂	-	50	-11.99	PAN	1.5	3.0	0.5	Embodiment 19	V	SiO ₂	0.1	51	-12.40	PAN	0.6	1.2	13
Comparative Examples 1	-	SO ₄/ZrO ₂	-	50	-11.99	PAN	1.5	3.0	0.5	Comparative Examples 2	-	-	-	-		-	1.0	1.0	2.0

From table 1, obviously find out, the methanol permeability of the proton conductive membrane of each embodiment 1-19 is well below the methanol permeability of NAFION 117 films of Comparative Examples 2, and the resistance of the proton conductive membrane of each embodiment 1-19 only is several times of resistance of NAFION 117 films of Comparative Examples 2.And, as from embodiment 1,17,18, obviously finding out, the polymeric material that is used to prepare film by change, thereby the wetability of change between inorganic material and organic material and the dispersibility of each inorganic material and organic material, to influence the fine structure of this film, change the proton conductive and the methanol permeability of this film thus.And, as from embodiment 1 and 19, obviously finding out,, changed proton conductive by on the degree of crystallinity of proton conducting inorganic material, changing.Particularly, wherein each oxide particle B and oxide carrier A be among the embodiment 19 of amorphous the lewis acid number of spots greater than oxide particle B wherein be amorphous and oxide carrier A be crystallization embodiment 1 in the lewis acid number of spots, thereby increased acidity, shown high proton conductivity thus.

The Comparative Examples of listing from table 12 is obviously found out, in comprising the fuel cell of NAFION 117 films as dielectric film, strides stream greatly under the situation that adopts 20% methanol solution, causes the maximum power density that is obtained only to be 2mW/cm ²On the other hand, in the fuel cell of each embodiment 1-19, proton conductive membrane can suppress to stride stream as dielectric film, obtains satisfied power density.Particularly, ZrO therein ₂Big as power density in the fuel cell of each embodiment 9-12 of the oxide carrier of proton conductive inorganic oxide material, the tungsten oxide particle is by ZrO therein ₂Obtained maximum power density in the fuel cell of the embodiment 12 that oxide carrier supports.

Utilize the monocell that wherein proton conductive membrane of each embodiment 1-19 is used as dielectric film, observe battery performance stability in time.Particularly, the methanol aqueous solution with 20% acts as a fuel and is supplied to monocell, allows air to flow in the monocell.In the case, the both sides with battery are heated to 40 ℃ to extract 10mA/cm ²Electric current, measure battery performance stability in time thus.Even find that output also is stable after several hrs.In addition, similarly measure, even found that output also is stable after several hrs at 150 ℃.

Utilize the fuel cell that wherein NAFION 117 films of Comparative Examples 2 is used as dielectric film, observe battery performance stability in time.Particularly, the methanol aqueous solution with 20% acts as a fuel and is supplied to fuel cell, allows air to flow in the fuel cell.In the case, the both sides with battery are heated to 40 ℃ to extract 10mA/cm ²Electric current, measure battery performance stability in time thus.Find only after a few minutes, just can not obtain to have exported.In addition, similarly measure, found that dielectric film becomes dry, thereby this is because strictly controlled humidity can not obtain output at 150 ℃.

[embodiment 20]

Except will in embodiment 1, changing into 0.7g, in embodiment 1, change into the 1.3g, as embodiment 1, obtain proton conductive inorganic oxide-PAN composite electrolyte membrane for the DMAc solution amount that contains 5%PAN of 2g for the proton conducting inorganic material amount of powder of 1g.In this proton conducting inorganic material powder, be 0.1 than X/Y at the element of the v element X of vanadium oxide and element silicon Y in silicon dioxide.Proton conducting inorganic material S and the ratio S/T of the total amount T of dielectric film are 0.9, and the thickness of thus obtained dielectric film is 100 μ m.

Utilize thus obtained dielectric film as embodiment 1, to make fuel liquid battery.

[embodiment 21]

Except will in embodiment 1, changing into 0.3g, in embodiment 1, change into the 0.7g, as embodiment 1, obtain proton conductive inorganic oxide-PAN composite electrolyte membrane for the DMAc solution amount that contains 5%PAN of 2g for the proton conducting inorganic material amount of powder of 1g.In this proton conducting inorganic material powder, be 0.1 than X/Y at the element of the v element X of vanadium oxide and element silicon Y in silicon dioxide.Proton conducting inorganic material S and the ratio S/T of the total amount T of proton conductive inorganic oxide-PAN composite electrolyte membrane are 0.9, and the thickness of thus obtained dielectric film is 50 μ m.

Measure the methanol permeability of proton conductive membrane and the maximum power density of resistance and fuel cell for embodiment 20 and 21 described as the front.Table 2 expression is together with each result of the result of the foregoing description 1.

Table 2

	The thickness of dielectric film (μ m)	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during the methanol aqueous solution of employing 20% ²)
	The thickness of dielectric film (μ m)	Relative methanol permeability	Relative film resistance		Embodiment 1	152	0.6	1.5	10
Embodiment 20	100	0.7	1.3	11	Embodiment 1	152	0.6	1.5	10
Embodiment 20	100	0.7	1.3	11	Embodiment 21	50	0.8	1.1	12

Find out obviously that from table 2 along with reducing of dielectric film thickness, the diffusion length of methyl alcohol shortens, so the decline of effective film resistance, be similar to about proton conductive.A kind ofly think reasonably to understand to be, to improve output thus although, these all conditions should be combined and determine membrane property so that film resistance obviously reduces along with the reduction methanol permeation increase of dielectric film thickness.

[embodiment 22]

Except what adopt is that 3.5g has than silica dioxide granule used among the embodiment 1 silicon dioxide (SiO of bigger serface more ₂) particle, then utilize thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain the vanadium oxide that supported by silicon dioxide, wherein, the v element X of vanadium oxide is 0.2 with the element of the element silicon Y of silicon dioxide than X/Y.The specific area of finding thus obtained proton conductive inorganic oxide material is 150m ²/ g.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide-PAN composite electrolyte membrane are 0.9, and the thickness of thus obtained dielectric film is 150 μ m.

[embodiment 23]

Except what adopt is that 2.5g has respectively than silica dioxide granule used in embodiment 1 and the 22 silicon dioxide (SiO of bigger serface more ₂) particle, then utilize thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PAN composite electrolyte membrane, as embodiment 1, obtain proton conductive inorganic oxide, promptly, the vanadium oxide that is supported by silicon dioxide, wherein, the v element X of vanadium oxide is 0.3 with the element of the element silicon Y of silicon dioxide than X/Y.The specific area of finding thus obtained proton conductive inorganic oxide material is 300m ²/ g.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide-PAN composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

Table 3

	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Specific area (m ²/g)	Acidity function H ₀	Polymeric material	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during adopting 20% methanol aqueous solution ²)
	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Specific area (m ²/g)	Acidity function H ₀	Polymeric material	Relative methanol permeability	Relative film resistance		Embodiment 1	V	SiO ₂	0.1	50	-11.99	PAN	0.6	1.5	10
Embodiment 22	V	SiO ₂	0.2	150	-11.99	PAN	0.6	1.3	12	Embodiment 1	V	SiO ₂	0.1	50	-11.99	PAN	0.6	1.5	10
Embodiment 22	V	SiO ₂	0.2	150	-11.99	PAN	0.6	1.3	12	Embodiment 23	V	SiO ₂	0.3	300	-11.99	PAN	0.6	1.1	14

From table 3, obviously find out, think that rational understanding is, along with SiO ₂Specific grain surface amasss the increase with the vanadium oxide amount, and the amount of lewis acid point increases.As a result, the proton conductive zone increases, and has reduced film resistance, has increased output thus.

[embodiment 24]

Be mixed and made into slurry by the proton conductive inorganic oxide material, platinum-ruthenium support catalyst, PAN and the DMAc that will be among the embodiment 1 obtain with the weight ratio of 0.45/0.45/0.1/5.0, then resulting slurry is coated on the carbon cloth of 32mm * 32mm, obtains to have 4mg/cm ²The fuel electrode of Pt-Ru catalytic amount.

Equally be mixed and made into slurry with the weight ratio of 0.45/0.45/0.1/5.0 by proton conductive inorganic oxide material, platinum support catalyst, PAN and the DMAc that will obtain among the embodiment 1, then resulting slurry is coated on the carbon cloth of 32mm * 32mm, obtains to have 4mg/cm ²The oxidant electrode of Pt catalytic amount.

In addition, prepared dielectric film is NAFION 117 films that are similar to the sort of film that adopts in the Comparative Examples 2.

Have again,, as embodiment 1, make fuel cell except this fuel electrode, this oxidant electrode and above-mentioned dielectric film are used to make the fuel cell.

[embodiment 25]

Except what adopt is the proton conductive membrane that obtains among the fuel electrode that obtains among the embodiment 24 and oxidant electrode and the embodiment 1, makes fuel cell as embodiment 1.

The cell resistance and the maximum power density of the fuel cell that measurement makes in each embodiment 24 and 25 the results are shown in the table 4.Table 4 also illustrates the result of the foregoing description 1 and Comparative Examples 2.

Table 4

	Fuel electrode	Dielectric film	Oxidant electrode	Electricity earth resistance (m Ω)	Maximum power density (mW/cm during adopting 20% methanol aqueous solution ²)
	Fuel electrode	Dielectric film	Oxidant electrode	Electricity earth resistance (m Ω)		Embodiment 1	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	24	10
Embodiment 24	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	27	8	Embodiment 1	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	24	10
Embodiment 24	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	27	8	Embodiment 25	Proton conductive inorganic oxide	Proton conductive inorganic oxide	Proton conductive inorganic oxide	20	25
Comparative Examples 2	The polymer that contains perfluorinated sulfonic acid	The polymer that contains perfluorinated sulfonic acid	The polymer that contains perfluorinated sulfonic acid	30	2.0	Embodiment 25	Proton conductive inorganic oxide	Proton conductive inorganic oxide	Proton conductive inorganic oxide	20	25

Find out obviously that from table 4 because used proton conductor has low resistance in fuel electrode, oxidant electrode or dielectric film, so cell resistance is low.And, because as shown in table 1 low like that of the methanol permeability of the dielectric film that obtains in embodiment 1, therefore the output characteristic that membrane electrode assembly showed that is obtained in each embodiment 1,24 and 25 is better than the output characteristic of the membrane electrode assembly of gained in Comparative Examples 2.

In boiling water, the proton conductive membrane that obtains in embodiment 1 and the Comparative Examples 1 carried out 1 hour boiling water treating.After boiling water treating, by the conductivity (film resistance) and the methanol permeability of preceding method measurement proton conductive membrane, the result is as shown in table 5.

Table 5

As shown in table 5, the conductivity of the proton conductive membrane of Comparative Examples 1 is starkly lower than with after the boiling water treating.Think that rational understanding is, removed by hydrolysis and be supported on the lip-deep sulfate radical of Zirconia carrier, obviously reduced in conductivity with the proton conductive membrane of the Comparative Examples after the boiling water treating 1.On the other hand, little to the influence of its conductivity with the proton conductive membrane of boiling water treating embodiment 1, this shows that the proton conductive membrane of embodiment 1 has high-fire resistance and high hydrolytic resistance.

In this case, obviously, proton conducting solid electrolyte of the present invention has more effectively suppressed methanol crossover, has kept proton conductive simultaneously.In view of the above, the invention provides a kind of like this proton conducting solid electrolyte: it can suppress the stream of striding of liquid fuel such as methyl alcohol; Simultaneously stably keep proton conductive in the wide temperature range between room temperature and about 150 ℃ temperature.

[embodiment 26]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 2g vanadium chloride VCl ₃300ml distilled water in the mixed solution made be heated to 80 ℃, stir this solution simultaneously and remove water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the vanadium oxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the v element X in vanadium oxide and the silicon dioxide is 0.1 than X/Y, and has 51m ²The specific area of/g.This proton conductive inorganic oxide powder is carried out X-ray diffraction measure, found that viewed all diffraction maximums all are derived from silicon dioxide, illustrate that vanadium oxide has non crystalline structure.

Point out in passing, measure the element of proton conductive inorganic oxide powder than X/Y and specific area by following method.Particularly, than X/Y, measure specific area by energy dissipation type x-ray analysis (EDX), the sub-spectrum of X-ray photoelectric (XPS) or atomic absorption light spectrometry element by the BET method.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the aqueous solution of 5% polyvinyl alcohol (PVA), at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into by the petri diss that tetrafluoroethene-perfluorinated alkoxy vinyl ether copolymer (PFA) is made, under air atmosphere, dried slurries with 60 ℃ and 150 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of dielectric film total amount T are 0.9, the thickness of dielectric film is 151 μ m.

[embodiment 27]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 3g chromium chloride hexahydrate CrCl ₃6H ₂The mixed solution for preparing in the 300ml distilled water of O joins 80 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain the proton conductive inorganic oxide powder thus, that is, and the composite powder that forms by the chromium oxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the chromium element X in chromium oxide and the silicon dioxide is 0.1 than X/Y, and has 52m ²The specific area of/g.This proton conductive inorganic oxide powder is carried out X-ray diffraction measure, found that viewed all diffraction maximums all are derived from silicon dioxide, illustrate that chromium oxide has non crystalline structure.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the aqueous solution of 5%PVA, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into the petri diss of being made by the PFA resin, under air atmosphere, dry slurries with 60 ℃ and 150 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of total film amount T are 0.9, the thickness of dielectric film is 151 μ m.

[embodiment 28]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 2g ammonium molybdate (NH ₄) ₆Mo ₇O ₂₄4H ₂The mixed solution of making in the 300ml distilled water of O is heated to 80 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Utilize agate mortar to grind thus obtained dusty material, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain to have 55m thus ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the composite powder that forms by the molybdenum oxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the molybdenum element X in molybdenum oxide and the silicon dioxide is 0.1 than X/Y, and has 55m ²The specific area of/g.This proton conductive inorganic oxide powder is carried out X-ray diffraction measure, found that viewed all diffraction maximums all are derived from silicon dioxide, illustrate that molybdenum oxide has non crystalline structure.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the aqueous solution of 5%PVA, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into the petri diss of being made by the PFA resin, under air atmosphere, dry slurries with 60 ℃ and 150 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of the total amount T of dielectric film are 0.9, the thickness of dielectric film is 155 μ m.

[embodiment 29]

With 5g silicon dioxide SiO ₂Join and wherein dissolved 3g sodium tungstate dihydrate NaWO ₄2H ₂The mixed solution of making in the 300ml distilled water of O and the 150ml 0.1N aqueous solution of nitric acid is heated to 80 ℃, stirs this solution simultaneously and removes water with 100ml/ hour evaporation rate.Then, residue was placed 12 hours with 100 ℃ in drying unit, obtained dusty material.Thus obtained dusty material is dispersed in the 100ml 0.1N aqueous solution of nitric acid, then carries out suction strainer, remove unwanted sodium ion.The solid constituent that obtains behind the suction strainer is placed 6 hours with except that anhydrating with 100 ℃ in drying unit, then utilize agate mortar to grind residue, then the rate of heat addition with 100 ℃/hour is heated to 700 ℃ with the dusty material that grinds in alumina crucible.The material that grinds was kept 4 hours with 700 ℃, obtain to have 50m thus ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the composite powder that forms by the tungsten oxide that is supported by silicon dioxide.It is found that in this composite material the element of the element silicon Y in the W elements X in tungsten oxide and the silicon dioxide is 0.1 than X/Y.This proton conductive inorganic oxide powder is carried out X-ray diffraction measure, found that viewed all diffraction maximums all are derived from silicon dioxide, illustrate that tungsten oxide has non crystalline structure.

The proton conductive inorganic oxide powder that 1g is heavy joins 2g and contains in the aqueous solution of 5%PVA, at room temperature resulting system is stirred 10 minutes, obtains slurry.Thus obtained slurry is put into the petri diss of being made by the PFA resin, under air atmosphere, dry slurries with 60 ℃.As a result, by evaporative removal the solvent in the slurry, obtain dielectric film.It is found that proton conductive inorganic oxide material S and the ratio S/T of the total amount T of dielectric film are 0.9, the thickness of dielectric film is 150 μ m.

[embodiment 30]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 26 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 26, obtain to have 54m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the vanadium oxide powder that oxidized titanium supports.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the v element X in vanadium oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[embodiment 31]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 27 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 27, obtain to have 49m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the chromium oxide powder that oxidized titanium supports.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the chromium element X in chromium oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 157 μ m.

[embodiment 32]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 28 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 28, obtain to have 48m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the molybdenum oxide powder that oxidized titanium supports.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the molybdenum element X in molybdenum oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 33]

Except using 7g titanium oxide (TiO ₂) replace adopting among the embodiment 29 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 29, obtain to have 50m ²The proton conductive inorganic oxide powder of/g specific area, that is, and the tungsten oxide powder that oxidized titanium supports.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the W elements X in tungsten oxide and the titanium oxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 154 μ m.

[embodiment 34]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 26 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 26, obtain to have 53m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the vanadium oxide powder that oxidized zirconium supports.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the v element X in vanadium oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 149 μ m.

[embodiment 35]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 27 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 27, obtain to have 50m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the chromium oxide powder that oxidized zirconium supports.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the chromium element X in chromium oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 36]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 28 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 28, obtain to have 51m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the molybdenum oxide powder that oxidized zirconium supports.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the molybdenum element X in molybdenum oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 37]

Except using 11g zirconia (ZrO ₂) replace adopting among the embodiment 29 5g silicon dioxide, then adopt thus obtained proton conductive inorganic oxide material to obtain outside proton conductive inorganic oxide material-PVA composite electrolyte membrane, as embodiment 29, obtain to have 50m ²The proton conductive inorganic oxide powder of the specific area of/g, that is, and the tungsten oxide powder that oxidized zirconium supports.In thus obtained proton conductive inorganic oxide powder, the element of the zr element Y in the W elements X in tungsten oxide and the zirconia is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[embodiment 38]

The 2g aqueous solution that contains 5%PVA that the 2g mixed solution that constitutes except the aqueous solution of using by the aqueous solution that contains 5%PVA of 1.5g and 0.5g that contains 5% polyacrylic acid (PA) replaces adopting, as embodiment 26, obtain proton conductive inorganic oxide material-PVAPA composite electrolyte membrane in embodiment 26.This proton conductive inorganic oxide powder has 53m ²The specific area of/g.In this proton conductive inorganic oxide powder, the element of the element silicon Y in the v element X in vanadium oxide and the silica is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVAPA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 153 μ m.

[embodiment 39]

The 2g aqueous solution that contains 5%PVA that the 2g mixed solution that constitutes except the aqueous solution of using by the aqueous solution that contains 5%PVA of 1.5g and 0.5g that contains 5% polyacrylic acid (PA) replaces adopting, as embodiment 27, obtain proton conductive inorganic oxide material-PVAPA composite electrolyte membrane in embodiment 27.This proton conductive inorganic oxide powder has 54m ²The specific area of/g.In thus obtained proton conductive inorganic oxide powder, the element of the element silicon Y in the chromium element X in chromium oxide and the silicon dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVAPA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 40]

The 2g aqueous solution that contains 5%PVA that the 2g mixed solution that constitutes except the aqueous solution of using by the aqueous solution that contains 5%PVA of 1.5g and 0.5g that contains 5% polyacrylic acid (PA) replaces adopting, as embodiment 28, obtain proton conductive inorganic oxide material-PVAPA composite electrolyte membrane in embodiment 28.This proton conductive inorganic oxide powder has 50m ²The specific area of/g.In thus obtained proton conductive inorganic oxide powder, the element of the element silicon Y in the molybdenum element X in molybdenum oxide and the silicon dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVAPA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[embodiment 41]

The 2g aqueous solution that contains 5%PVA that the 2g mixed solution that constitutes except the aqueous solution of using by the aqueous solution that contains 5%PVA of 1.5g and 0.5g that contains 5% polyacrylic acid (PA) replaces adopting, as embodiment 29, obtain proton conductive inorganic oxide material-PVAPA composite electrolyte membrane in embodiment 29.This proton conductive inorganic oxide powder has 51m ²The specific area of/g.In thus obtained proton conductive inorganic oxide powder, the element of the element silicon Y in the W elements X in tungsten oxide and the silicon dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVAPA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 42]

Except the 2g aqueous solution that contains 5%PVA that replaces in embodiment 30, adopting with the 2g aqueous solution that contains 5% polyvinyl alcohol (PEG), as embodiment 30, obtain proton conductive inorganic oxide material-PEG composite electrolyte membrane.This proton conductive inorganic oxide powder has 52m ²The specific area of/g.In this proton conductive inorganic oxide powder, the element of the titanium elements Y in the v element X in vanadium oxide and the titanium dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PEG composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 43]

Except the 2g aqueous solution that contains 5%PVA that replaces in embodiment 30, adopting with the 2g formic acid solution that contains 5% nylon 6, as embodiment 30, obtain proton conductive inorganic oxide material-nylon 6 composite electrolyte membranes.This proton conductive inorganic oxide powder has 51m ²The specific area of/g.In thus obtained proton conductive inorganic oxide powder, the element of the titanium elements Y in the v element X in vanadium oxide and the titanium dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-nylon 6 composite electrolyte membranes are 0.9, and the thickness of dielectric film is 157 μ m.

[embodiment 44]

Except the 2g aqueous solution that contains 5%PVA that replaces in embodiment 30, adopting with the 2g toluene solution that contains 5% polystyrene (PS), as embodiment 30, obtain proton conductive inorganic oxide material-PS composite electrolyte membrane.This proton conductive inorganic oxide powder has 54m ²The specific area of/g.In this proton conductive inorganic oxide powder, the element of the titanium elements Y in the v element X in vanadium oxide and the titanium dioxide is 0.1 than X/Y.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PS composite electrolyte membrane are 0.9, and the thickness of dielectric film is 155 μ m.

[Comparative Examples 3]

NAFION 117 films (registered trade mark) that preparation is made by E.I.Du Pont Company are as dielectric film.

When water being added in the proton conductive membrane for preparing among the embodiment 26-43, each proton conductive membrane expands significantly, and this proton conductive membrane is peeled off from the petri diss of being made by the PFA resin.Find in the case, this film is flexible, when passing through by m-nitrotoleune (pKa=-11.99), p-nitro fluorobenzene (pKa=-12.40), p-nitro-chlorobenzene (pKa=-12.70), m-nitro-chlorobenzene (pKa=-13.16), 2,4-dinitrotoluene (DNT) (pKa=-13.75) and 2, the acidity indicating gage that 4-dinitrofluorobenzene (pKa=-14.52) constitutes show the solid peracidity when measuring.Table 6 is also represented the Hammett acidity function H of each proton conductive membrane ₀

On the other hand, be used for making proton conductive membrane to expand the required water yield greater than making the required water yield of proton conductive membrane expansion that in each embodiment 26-43, prepares in embodiment 44 preparations.

And, utilize the dielectric film of preparation in each embodiment 26-44 and Comparative Examples 3 to assemble fuel liquid battery as follows.

Particularly, contain the electrode (catalytic amount: Pt4mg/cm that cathod catalyst supports platinum by making ², make by E-tek company) and be marked with 5%NAFION solution, make oxidant electrode 3 thus.And, contain the electrode (catalytic amount: Pt-Ru 4mg/cm that anode catalyst supports the platinum ruthenium by making ², make by E-tek company) and be marked with 5%NAFION solution, make fuel electrode 2 thus.

In next step, the porous carbon sheet of the stacked evaporation section 6 that acts as a fuel on the fuel electrode 2 of thus obtained membrane electrode assembly 5, this porous carbon sheet has the average pore size of 100 μ m and 70% porosity.In addition, be provided as the porous carbon sheet of fuel infiltration part 7 on fuel vaporization part 6, this porous carbon sheet has the average pore size of 5 μ m and 40% porosity.Have again, in the space that between the support 11 of the support 10 of oxidant electrode and fuel electrode, limits resulting structures is set, obtain the monocell of structure shown in Figure 2 thus.The response area of monocell is 10 square centimeters, and the groove 9 that being used to of forming in the support 10 of oxidant supplied oxidant gas has the degree of depth of 2mm and the width of 1mm.

Utilize capillarity to introduce thus obtained fuel liquid battery from the side of fuel infiltration part 7 as 20% methanol aqueous solution of liquid fuel.On the other hand, make with 1atm and flow through gas passage 9 with the flow velocity of 100ml/min, thereby realize generating as the air of oxidant gas.Carbon dioxide (the CO that will produce according to electric power generation reaction ₂) be discharged into the outside by fuel vaporization part 6 shown in Figure 2.Table 6 is also represented maximum power density.

In addition, table 6 shows the methanol permeability of above-mentioned proton conductive membrane and the measurement result of film resistance.It should be noted that being made as 1 respectively with the methanol permeability of NAFION 117 films of Comparative Examples 3 and film resistance is prerequisite, has provided the relative value of methanol permeability and film resistance respectively in the table 6.

Point out that in passing in order to measure methanol permeability, the proton conductive membrane that will have 10 square centimeters area inserts in the battery, and battery is divided into two parts.Then, 10% methanol aqueous solution is injected one of two batteries parts of separating, and pure water is injected another battery part, the temperature of this system is remained on room temperature.After the scheduled time, measure the split cell methanol concentration partly that has injected pure water therein, obtain methanol permeation by gas chromatography.Proton conductive membrane was immersed in the water 16 hours, measure methanol permeation from film, removing the back of anhydrating.

And, by the resistance of four terminal DC methods measurement film.Particularly, proton conductive membrane is inserted between two batteries of the area that has 10 square centimeters respectively.Then, 10% aqueous sulfuric acid is injected each battery.With this understanding, allow the DC electric current at room temperature flow through aqueous sulfuric acid, measure the voltage drop that existence or shortage by proton conductive membrane cause, measure film resistance thus.

Table 6

	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Acidity function H ₀	Hydrophilic polymer	Equilibrium water conten absorptivity (%)	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during the methanol aqueous solution of employing 20% ²)
	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Acidity function H ₀	Hydrophilic polymer	Equilibrium water conten absorptivity (%)	Relative methanol permeability	Relative film resistance		Embodiment 26	V	SiO ₂	0.1	- 11.99	PVA	25	0.8	0.9	15
Embodiment 27	Cr	SiO ₂	0.1	- 11.99	PVA	25	0.8	0.8	16	Embodiment 26	V	SiO ₂	0.1	- 11.99	PVA	25	0.8	0.9	15
Embodiment 27	Cr	SiO ₂	0.1	- 11.99	PVA	25	0.8	0.8	16	Embodiment 28	Mo	SiO ₂	0.1	-12.40	PVA	25	0.7	0.8	17
Embodiment 29	W	SiO ₂	0.1	-12.40	PVA	25	0.7	0.7	18	Embodiment 28	Mo	SiO ₂	0.1	-12.40	PVA	25	0.7	0.8	17
Embodiment 29	W	SiO ₂	0.1	-12.40	PVA	25	0.7	0.7	18	Embodiment 30	V	TiO ₂	0.1	-12.70	PVA	25	0.7	0.6	23
Embodiment 31	Cr	TiO ₂	0.1	-12.70	PVA	25	0.6	0.6	24	Embodiment 30	V	TiO ₂	0.1	-12.70	PVA	25	0.7	0.6	23
Embodiment 31	Cr	TiO ₂	0.1	-12.70	PVA	25	0.6	0.6	24	Embodiment 32	Mo	TiO ₂	0.1	-13.16	PVA	25	0.5	0.5	26
Embodiment 33	W	TiO ₂	0.1	-13.16	PVA	25	0.5	0.4	27	Embodiment 32	Mo	TiO ₂	0.1	-13.16	PVA	25	0.5	0.5	26
Embodiment 33	W	TiO ₂	0.1	-13.16	PVA	25	0.5	0.4	27	Embodiment 34	V	ZrO ₂	0.1	-13.75	PVA	25	0.4	0.4	30
Embodiment 35	Cr	ZrO ₂	0.1	-13.75	PVA	25	0.4	0.3	31	Embodiment 34	V	ZrO ₂	0.1	-13.75	PVA	25	0.4	0.4	30
Embodiment 35	Cr	ZrO ₂	0.1	-13.75	PVA	25	0.4	0.3	31	Embodiment 36	Mo	ZrO ₂	0.1	-14.50	PVA	25	0.3	0.3	34
Embodiment 37	W	ZrO ₂	0.1	-14.50	PVA	25	0.3	0.2	36	Embodiment 36	Mo	ZrO ₂	0.1	-14.50	PVA	25	0.3	0.3	34
Embodiment 37	W	ZrO ₂	0.1	-14.50	PVA	25	0.3	0.2	36	Embodiment 38	V	SiO ₂	0.1	-13.16	PVA.PA	32	0.9	0.3	20
Embodiment 39	Cr	SiO ₂	0.1	-13.16	PVA.PA	32	0.9	0.3	21	Embodiment 38	V	SiO ₂	0.1	-13.16	PVA.PA	32	0.9	0.3	20
Embodiment 39	Cr	SiO ₂	0.1	-13.16	PVA.PA	32	0.9	0.3	21	Embodiment 40	Mo	SiO ₂	0.1	-13.75	PVA.PA	32	0.8	0.2	22
Embodiment 41	W	SiO ₂	0.1	-13.75	PVA.PA	32	0.8	0.1	23	Embodiment 40	Mo	SiO ₂	0.1	-13.75	PVA.PA	32	0.8	0.2	22
Embodiment 41	W	SiO ₂	0.1	-13.75	PVA.PA	32	0.8	0.1	23	Embodiment 42	V	TiO ₂	0.1	-12.70	PEG	20	0.6	0.7	19
Embodiment 43	V	TiO ₂	0.1	-12.70	Nylon6	10	0.5	0.8	16	Embodiment 42	V	TiO ₂	0.1	-12.70	PEG	20	0.6	0.7	19
Embodiment 43	V	TiO ₂	0.1	-12.70	Nylon6	10	0.5	0.8	16	Embodiment 44	V	TiO ₂	0.1	-12.70	PS	0.05	0.4	1.3	13
Comparative Examples 3	-	-	-	-	-	-	1.0	1.0	2.0	Embodiment 44	V	TiO ₂	0.1	-12.70	PS	0.05	0.4	1.3	13

Find out obviously that from table 6 methanol permeability of the proton conductive membrane of each embodiment 26-43 and resistance are well below the methanol permeability and the resistance of NAFION 117 films of Comparative Examples 3.And, as from embodiment 30,42,43 and 44, obviously finding out, be used to prepare the polymeric material of film, thereby changed the rate of water absorption of polymeric material by change.As a result, the wetability between inorganic material and organic material, dispersiveness and water absorbing capacity change, thereby influence the fine structure of this film, change the proton conductive and the methanol permeability of this film thus.Particularly, along with the equilibrium water conten absorptivity from 0.05% increase to 10%, 20%, until 25%, reduced the resistance of proton conductive membrane.It should be noted that the decline along with the equilibrium water conten absorptivity, methanol permeability descends.

The Comparative Examples of listing from table 63 is obviously found out, in comprising the fuel cell of NAFION 117 films as dielectric film, has increased in 20% methanol aqueous solution and has striden stream and film resistance, causes the maximum power density that is obtained only to be 2.0mW/cm ²On the other hand, in the fuel cell of proton conductive membrane in adopting each embodiment 26-44, can suppress to stride stream, obtain satisfied power density as dielectric film.Particularly, in the fuel cell of proton conductive membrane that adopts each embodiment 26-43, can suppress to stride stream, reduce film resistance, obtain more gratifying power density as dielectric film.Particularly, ZrO therein ₂Obtained high power density in the fuel cell as each embodiment 34-37 of oxide carrier, the tungsten oxide particle is by ZrO therein ₂Obtained maximum power density in the fuel cell of the embodiment 37 that oxide carrier supports.

Utilize the monocell that wherein proton conductive membrane of each embodiment 26-43 is used as dielectric film, observe battery performance stability in time.Particularly, the methanol aqueous solution with 20% is supplied to monocell as liquid fuel, allows air to flow in the monocell.In the case, the both sides with battery are heated to 40 ℃ to extract 10mA/cm ²Current density, measure battery performance stability in time thus.Even find that output also is stable after several hrs.In addition, similarly measure, even found that output also is stable after several hrs at 150 ℃.

Utilize the fuel cell that wherein (Comparative Examples 3) NAFION 117 films is used as dielectric film, observe battery performance stability in time equally.Particularly, the methanol aqueous solution with 20% is supplied to fuel cell as liquid fuel, allows air to flow in the fuel cell.In the case, the both sides with battery are heated to 40 ℃ to extract 10mA/cm ²Current density, measure battery performance stability in time thus.Find only after a few minutes, just can not obtain to have exported.In addition, similarly measure, found that dielectric film becomes dry, thereby this is because strictly controlled humidity can not obtain output at 150 ℃.

[embodiment 45]

Except the 2g aqueous solution that contains 5%PVA (100% saponification degree) that replaces in embodiment 26, adopting with the 2g aqueous solution that contains 2% PVA (85% saponification degree), as embodiment 26, obtain proton conductive inorganic oxide material-PVA composite electrolyte membrane.In this proton conductive inorganic oxide material, specific area is 53m ²The element of element silicon Y among the/g, the v element X in vanadium oxide and silicon dioxide is 0.1 than X/Y.And proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

[embodiment 45]

Except the 2g aqueous solution that contains 5%PVA (100% saponification degree) that replaces in embodiment 26, adopting with the 2g aqueous solution that contains 2% PVA (70% saponification degree), as embodiment 26, obtain proton conductive inorganic oxide material-PVA composite electrolyte membrane.In this proton conductive inorganic oxide material, specific area is 51m ²The element of element silicon Y among the/g, the v element X in vanadium oxide and silicon dioxide is 0.1 than X/Y.And proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

Utilize thus obtained dielectric film as embodiment 26, to make fuel liquid battery.

Aforementioned manner as embodiment 45 and 46 is measured the methanol permeability of proton conductive membrane and the maximum power density of resistance and fuel cell.Table 7 expression is together with each result of the result of previous embodiment 26.

Table 7

	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Hydrophilic polymer	Saponification degree (%)	Equilibrium water absorptivity (%)	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during the methanol aqueous solution of employing 20% ²)
	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Hydrophilic polymer	Saponification degree (%)	Equilibrium water absorptivity (%)	Relative methanol permeability	Relative film resistance		Embodiment 26	V	SiO ₂	0.1	PVA	100	25	0.8	0.9	15
Embodiment 45	V	SiO ₂	0.1	PVA	85	20	0.7	1.0	14	Embodiment 26	V	SiO ₂	0.1	PVA	100	25	0.8	0.9	15
Embodiment 45	V	SiO ₂	0.1	PVA	85	20	0.7	1.0	14	Embodiment 46	V	SiO ₂	0.1	PVA	70	15	0.6	1.3	12

Find out obviously that from table 7 along with the reduction of PVA saponification degree, the equilibrium water conten absorptivity reduces, the result causes enough a large amount of water stop supplies in solid superacid.As a result, although film resistance increases, methanol permeation also reduces.Think that rational understanding is,, make that the raising along with the PVA saponification degree increases output all these conditions definite membrane property that combines.

[embodiment 47]

Except being that 150 ℃ bake out temperature is changed into 100 ℃, as embodiment 26, obtain proton conductive inorganic oxide material-PVA composite electrolyte membrane in embodiment 26.In this proton conductive inorganic oxide material, the element of the element silicon Y in the v element X in vanadium oxide and the silicon dioxide is 0.1 than X/Y.The specific area of this proton conductive inorganic oxide material is 53m ²/ g.And proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 150 μ m.

[embodiment 48]

Except being that 150 ℃ bake out temperature is changed into 180 ℃, as embodiment 26, obtain proton conductive inorganic oxide material-PVA composite electrolyte membrane in embodiment 26.In this proton conductive inorganic oxide material, the element of the element silicon Y in the v element X in vanadium oxide and the silicon dioxide is 0.1 than X/Y.The specific area of thus obtained proton conductive inorganic oxide material is 55m ²/ g.In addition, proton conductive inorganic oxide material S and the ratio S/T of the total amount T of proton conductive inorganic oxide material-PVA composite electrolyte membrane are 0.9, and the thickness of dielectric film is 151 μ m.

Aforementioned manner as embodiment 47 and 48 is measured the methanol permeability of proton conductive membrane and the maximum power density of resistance and fuel cell.Table 8 illustrates each result together with the result of previous embodiment 26.

Table 8

	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Hydrophilic polymer	Heat treatment temperature	Equilibrium water conten absorptivity (%)	Relative methanol permeability	Relative film resistance	Maximum power density (mW/cm during the methanol aqueous solution of employing 20% ²)
	Oxide B element X	The oxide A that contains element Y	Element is than (X/Y)	Hydrophilic polymer	Heat treatment temperature	Equilibrium water conten absorptivity (%)	Relative methanol permeability	Relative film resistance		Embodiment 26	V	SiO ₂	0.1	PVA	150	25	0.8	0.9	15
Embodiment 47	V	SiO ₂	0.1	PVA	100	30	0.9	0.6	14	Embodiment 26	V	SiO ₂	0.1	PVA	150	25	0.8	0.9	15
Embodiment 47	V	SiO ₂	0.1	PVA	100	30	0.9	0.6	14	Embodiment 48	V	SiO ₂	0.1	PVA	180	3	0.5	1.3	13

Find out obviously that from table 8 along with the raising of heat treatment temperature, the equilibrium water conten absorptivity descends.Think that rational understanding is, the raising of heat treatment temperature helps the reaction between PVA and solid superacid, thereby the hydrophilic hydroxyl groups in the PVA is converted into hydrophobic ketone group, has reduced the equilibrium water conten absorptivity thus.Particularly,, improved the water absorption of film, thereby enough a large amount of water can have been offered solid superacid, reduced film resistance thus along with the reduction of heat treatment temperature.On the other hand, when near methanol crossover, improved the density of dielectric film under the situation of at high temperature heat-treating, thereby reduced methanol permeability.Think that rational understanding is, these all conditions are combined definite membrane property, the result makes and obtain the highest output under the situation of heat-treating with 150 ℃.

[embodiment 49]

The proton conductive inorganic oxide material, platinum-ruthenium support catalyst, PVA and the water that obtain among the embodiment 26 are mixed and made into slurry with the weight ratio of 0.45/0.45/0.1/5.0, then the gained slurry are coated on the carbon cloth of 32mm * 32mm, obtain to have 4mg/cm ²The fuel electrode of Pt-Ru catalytic amount.

Equally, the proton conductive inorganic oxide material, platinum support catalyst, PVA and the water that obtain among the embodiment 26 are mixed and made into slurry with the weight ratio of 0.45/0.45/0.1/5.0, then the gained slurry is coated on the carbon cloth of 32mm * 32mm, obtains to have 4mg/cm ²The oxidant electrode of Pt catalytic amount.

In addition, will be similar to the NAFION 11 of the film that is adopted in the Comparative Examples 3, film is as dielectric film.

Have again,, as embodiment 26, make fuel cell except above-mentioned fuel electrode, oxidant electrode and dielectric film are used to make the fuel cell.

[embodiment 50]

The fuel electrode and oxidant electrode in adopting embodiment 49, as embodiment 26, make fuel cell.

Measure respectively the cell resistance and the maximum power density of the fuel cell of making by embodiment 49 and 50, the results are shown in the table 9.Table 9 is also represented the result of the foregoing description 26 and Comparative Examples 3.

Table 9

	Fuel electrode	Dielectric film	Oxidant electrode	Cell resistance (m Ω)	Maximum power density (mW/cm during adopting 20% methanol aqueous solution ²)
	Fuel electrode	Dielectric film	Oxidant electrode	Cell resistance (m Ω)		Embodiment 26	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	20	15
Embodiment 49	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	27	11	Embodiment 26	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	20	15
Embodiment 49	Proton conductive inorganic oxide	The polymer that contains perfluorinated sulfonic acid	Proton conductive inorganic oxide	27	11	Embodiment 50	Proton conductive inorganic oxide	Proton conductive inorganic oxide	Proton conductive inorganic oxide	15	30
Comparative Examples 3	The polymer that contains perfluorinated sulfonic acid	The polymer that contains perfluorinated sulfonic acid	The polymer that contains perfluorinated sulfonic acid	30	2.0	Embodiment 50	Proton conductive inorganic oxide	Proton conductive inorganic oxide	Proton conductive inorganic oxide	15	30

Find out obviously that from table 9 each embodiment 26,49 and 50 fuel cell show the output characteristic of the fuel cell that is better than Comparative Examples 3.Think that rational understanding is, in the fuel cell of each embodiment 26,49,50, obtained excellent output characteristic and be that used proton conductor shows low resistance in the electrode of reduced methanol permeability, embodiment 49 because the dielectric film of embodiment 26 shows, the fuel cell of making in embodiment 50 has adopted the dielectric film of embodiment 26 and the electrode of embodiment 49, has shown the highest output.

Obviously find out from above-mentioned experimental data, if at least one that makes fuel electrode, oxidant electrode and dielectric film comprises the proton conducting material that contains proton conductive inorganic oxide and hydrophilic polymer material, just can satisfy proton conductive and methanol permeability simultaneously.In view of the above, the invention provides electrode for fuel cell, membrane electrode assembly and the fuel cell that can produce stable output.

As the detailed description of carrying out above, according to the embodiment of the present invention, can obtain a kind of like this fuel cell, its volume is little, the performance high-performance, produce stable output.Certainly, the present invention has produced astonishing industrial value.

Those skilled in the art is very easy to find the additional advantages and modifications mode.Therefore, the present invention is not limited to above-mentioned particular content and illustrative examples in a broad sense.Therefore, under the situation of essence that does not break away from the total inventive concept that limits by accessory claim and its content of equal value and scope, can carry out various modifications.

Claims

1. proton conductive membrane comprises:

Proton conductive inorganic oxide with solid peracidity; With

The hydrophilic polymer material that contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.

2. according to the proton conductive membrane of claim 1, described proton conductive membrane is prepared by following manner: the slurry that will contain proton conductive inorganic oxide and hydrophilic polymer material forms film, then, described film is heat-treated not being higher than under 200 ℃ the temperature.

3. according to the proton conductive membrane of claim 1, wherein, described hydrophilic polymer material is not less than 5% equilibrium water conten absorptivity being not less than to show under 20 ℃ the temperature.

4. according to the proton conductive membrane of claim 1, wherein, the Hammett acidity function H of described proton conductive inorganic oxide ₀Less than-11.93.

5. according to the proton conductive membrane of claim 1, wherein, described proton conductive inorganic oxide comprises oxide carrier and is supported on the lip-deep oxide particle of oxide carrier, oxide carrier contains the element Y that is made of at least a element that is selected from Ti, Zr, Si and Al, and oxide particle contains the element X that is made of at least a element that is selected from W, Mo, Cr and V.

6. according to the proton conductive membrane of claim 1, wherein, described hydrophilic polymer material is at least a polymeric material that is selected from polyvinyl alcohol, polyacrylic acid, polyethylene glycol, cellulose, polyamide and polyvinylpyrrolidone.

7. according to the proton conductive membrane of claim 1, wherein, described hydrophilic polymer material comprises the polyvinyl alcohol of the saponification degree with 50-100%.

8. membrane electrode assembly, comprise fuel electrode, oxidant electrode and be arranged on fuel electrode and oxidant electrode between dielectric film, wherein:

At least a of fuel electrode, oxidant electrode and dielectric film comprises: the proton conductive inorganic oxide with solid peracidity; With the hydrophilic polymer material that contains at least a atomic group that is selected from hydroxyl, carboxyl, ehter bond and amido link.

9. fuel cell, comprise fuel electrode, oxidant electrode and be arranged on fuel electrode and oxidant electrode between dielectric film, wherein: