CN103165904B - Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof - Google Patents
Integrated regenerative fuel cell membrane electrode assembly and preparation method thereof Download PDFInfo
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- CN103165904B CN103165904B CN201110428553.3A CN201110428553A CN103165904B CN 103165904 B CN103165904 B CN 103165904B CN 201110428553 A CN201110428553 A CN 201110428553A CN 103165904 B CN103165904 B CN 103165904B
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Abstract
The invention relates to an integrated regenerative fuel cell membrane electrode assembly and a preparation method of the integrated regenerative fuel cell membrane electrode assembly. The integrated regenerative fuel cell membrane electrode assembly comprises a specific combination of fuel cell oxygen reduction and water electrolysis double-effect catalytic agent. The integrated regenerative fuel cell membrane electrode assembly further comprises a special protection gasket, the special protection gasket is added in connection surfaces among a polyester frame, a gas diffusion layer and a proton exchange membrane in the process of hot pressing to protect the proton exchange membrane, so that the proton exchange membrane is prevented from being cut and damaged by the polyester frame and the gas diffusion layer in the process of ethylene-methyl acrylate (EMA) hot pressing, and therefore the reliability and durability of an integrated regenerative fuel cell membrane electrode are improved, and the performance of a uniform regeneration fuel cell (URFC) is improved.
Description
Invention field
The present invention relates to fuel cell critical material and preparation method thereof, be specifically related to a kind of integral regeneratable fuel cell membrane-electrode assembly and preparation method thereof.
Background technology
Fuel cell is a kind of electrochemical appliance chemical energy of fuel directly being changed into electric energy.It is by the restriction of Carnot Engine circulation, and energy conversion efficiency is high, and pollution-free, specific power is large, long service life, and therefore in Aero-Space, communications and transportation, the fields such as portable power source have a wide range of applications.Integral regeneratable fuel cell (URFC) is integrated with fuel cell and water electrolysis two kinds of functions in one, can realize fuel cell power generation and water electrolysis two processes in a battery respectively, has generating and energy storage dual-use function.This battery system height is integrated, and battery specific power is large, and system specific energy is high, is a kind of high-efficiency energy-storage device having development prospect.
Membrane electrode (MEA) is the core component of URFC fuel cell, and it is the place that fuel and oxidant generation electrochemical reaction produce electric energy, simultaneously or water electrolysis produces the place of hydrogen and oxygen.The height of its performance, reliability and stability directly determines the quality of fuel cell and water electrolysis performance, high-performance membrane electrode sub-assembly and preparation to the raising of URFC fuel battery performance and the propelling of practicalization most important.URFC fuel cell membrane electrode composed as follows: be amberplex in the middle of its, the both sides of amberplex are negative electrode economic benefits and social benefits Catalytic Layer and anode catalyst layer respectively, the outside of cathode and anode Catalytic Layer is cathode diffusion layer and anode diffusion layer respectively, and this MEA adds up to and is made up of five layers of destructing.Usually, during preparation MEA by with Catalytic Layer diffusion layer and amberplex or cut to appropriate size by diffusion layer with the amberplex of Catalytic Layer, five layers of alignment stack hot pressing under uniform temperature and pressure, cooling and shaping forms membrane electrode (MEA).Yin, yang the two poles of the earth Catalytic Layer and the vertically superposed part of diffusion layer is only had to be only the real effective active area of membrane electrode in MEA.In addition, because the voltage of single fuel cell is lower, usually more piece monocell to be combined into battery pack by filter press mode.In battery pack, MEA is clipped in the middle of two panels bipolar plates, seals between the periphery of MEA and bipolar plates with encapsulant.Visible, in URFC fuel cell membrane electrode (MEA), not only there are fuel and oxidant generation electrochemical reaction to produce the process of electric energy, in addition, the process that water electrolysis produces hydrogen and oxygen is also carried out in membrane electrode when water electrolysis, water electrolysis process produces a large amount of hydrogen and oxygen discharges in pole catalyze layer, it is very large to the impulsive force of MEA, if MEA sealing property is bad, not only increase the risk that hydrogen-oxygen is altered mutually, reduce battery open circuit, and make troubles to the integral sealing of MEA in battery pack and stable operation.If MEA seal area intensity is not high on the other hand, in cell assembling processes, diffusion layer deformation can peel off proton exchange membrane, and electrode is absorbed in runner, blocking material or the transmission of oxidant in runner.In addition under the effect of battery assembling thrust, membrane electrode edge seal district by stress deformation, easily produce hallrcuts, micropore even large area tear, reduce the performance of battery and even cause complete cell failure.Therefore ensure that MEA sealing reliability is concerning all most important the assembling of fuel cell battery group and performance.
At present existing multiple film electrode preparation method, patent US 0224233 A1 describes the making layer compression technology of a proton exchanging film fuel battery MEA, and this MEA is of five storeys structure, and 5 layer MEAs are contained bonded assemblies and pressed together by laminating.This technique has simply, feature efficiently.Together with its anode gas diffusion layer, membrane electrode and cathode gas diffusion layer are pressed onto in the condition lower floor of low-temp low-pressure, this simplify the preparation of MEA and the assembling process of pile, and membrane electrode phenomenon that is damaged because of hot pressing or perforation decreases, the reliability of MEA is improved.Patent US5211984 A adopts transfer method to prepare electrode, and its active layer is prepared on dielectric film, cumbersome, and repeatability is poor, easily damage dielectric film, and manufacturing cycle is long, is not suitable for commercially producing.CN 1269428A discloses a kind of preparation method of three-in-one membrane electrode assembly, it is characterized in that: utilize heat to turn platen press, by the powder that catalyst and proton conductor polymer are made, is directly hot-pressed onto in proton exchange membrane, forms three-in-one component; Wherein proton conductor polymer is selected from Nafion, and the mass ratio of catalyst and proton conductor polymer is 5-0.5, makes powder particle size and is less than 30 microns, the temperature of hot pressing synthesis at 130-190 DEG C, pressure 5-10MPa, time 60-90 second.The method that CN1477724A announces first on substrate < polytetrafluoroethylene (PTFE) the film > of an inertia, constructs Catalytic Layer, and the method shifted by hot pressing is subsequently transferred on proton conductive membrane makes MEA.Patent US 5237777 describes a kind of method preparing efficient film electrode, and it is first by catalyst, Na
+after type Nafion resin, glycerine fully mix, be applied on polytetrafluoroethylene film, after oven dry, then high temperature hot pressing transfers to Na
+on the proton conductive membrane of type, divest PTFE film, then obtain three in one membreane electrode by after conducting film again protonated process.The method can be prepared low Platinum loading, have the MEA of the feature such as film hydrophilic, continuous catalysis layer.But this MEA preparation method indirectly catalyst is applied on film, complex steps, not easily large-scale production.Meanwhile, owing to increasing intermediate catalyst layer transfering process, add the manufacturing cost of membrane electrode assembly, and Catalytic Layer from inert coating to proton conductive membrane on transfer efficiency cannot ensure, limit it and further apply.Patent CN20051003183 1.6 introduces a kind of MEA preparation method, its feature utilizing the media such as the carbon fiber in MEA, Nafion resin, catalyst to absorb microwave and generate heat, the MEA of multiple-layer stacked is pressurizeed, after being added to the pressure of setting, heat with microwave, MEA hot pressing is formed as a whole.This method once can laminate the feature that 10-50 group MEA. has homogeneous heating, speed is fast, the heating-up time is short, electricity consumption is few.Patent CN 1269428A discloses a kind of preparation method of three-in-one membrane electrode assembly, by the powder that catalyst and proton conductor polymer are made, directly be hot-pressed onto in proton exchange membrane, form three-in-one component, this invention can need to make multi-purpose three-in-one component according to difference, and preparation method is easy, quick, but fuel battery performance prepared by the method is not high.
As seen from the above analysis, traditional method for preparing membrane electrode is superimposed by edge-protected to hydrogen electrode good for closed assembly, proton exchange membrane, oxygen electrode and MEA frame, is clipped in two pieces of corrosion resistant plates, then sends in resistance furnace or hydraulic press hot pressing forms.Although these method for preparing membrane electrode have, equipment cost is low, the simple advantage of technique; but also there are some problems: 1) intersection of proton exchange membrane and diffusion layer-bearer bar easily produces deformation in hot pressing, membrane electrode reliability and stability are poor.2) proton exchange membrane affects sealing effectiveness after producing deformation, and diffusion layer during hot pressing-bearer bar border produces failure by shear to proton exchange membrane, and membrane electrode easily leaks gas, MEA difficult quality guarantee.3) when battery is assembled, proton exchange membrane and diffusion layer-polyester bearer bar intersection, by stress rupture, cause proton exchange film rupture, reduce the useful life of MEA, affect the stability of battery operation.In a word, traditional method for preparing membrane electrode is not suitable for the membrane electrode for preparation URFC fuel cell.
Summary of the invention
The present invention is directed to the problems referred to above, there is provided a kind of fuel cell power generation and water electrolysis performance is good, not easily shape is split, the life-span is long, reliability is high MEA preparation method, exploitation good stability, can the preparation method with the URFC fuel cell membrane-electrode assembly of fuel cell and water electrolysis economic benefits and social benefits functional structure of mass production.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of integral regeneratable fuel cell membrane-electrode assembly, sub-assembly comprises dielectric film, the anode being arranged at dielectric film both side surface respectively and negative electrode; Be provided with the bearer bar of ring-type in two sides of dielectric film, anode and negative electrode lay respectively at the circular hollow place of bearer bar.The transition region being provided with ring-type at the intersection of the inside edge of ring protection frame and anode and negative electrode protects pad; The shape of protection pad is identical with the shape of bearer bar; neonychium sheet ring-type hollow bulb part size is less than the hollow part size of corresponding section bearer bar; the outer size peripherally located of protection pad is greater than the hollow part size of corresponding section bearer bar; make the surrounding outer ledge of protection pad part be between dielectric film and bearer bar, make the surrounding inside edge of protection pad part be in intersection anode and negative electrode on.
Dual purpose catalyst in described dual purpose catalyst layer be load or non-load at supported catalyst, two metalloid catalyst granuless combinations of the active ingredient of catalyst to be particle diameter be 0.2 nanometer to 200 nanometer, the layer thickness of catalyst layer is less than or equal to 200um; Wherein a class particle is selected from more than one in the simple metal nano particle of Pt, Pd, Ru, Rh, Ir; Wherein another kind of particle is selected from Ru, Rh, Ir, RuO
2, RhO
2, IrO
2more than one of nano particle.
The carrier that dual purpose catalyst adopts is titanium valve, iridium powder, ruthenium powder, rhodium powder, iridium dioxide, titanium oxide, ruthenic oxide, rhodium dioxide, conductivity ceramics, silicon nitride, carborundum, silicon dioxide, boron nitride, boron carbide, boron oxide, the tungsten carbide particle of nanometer and/or micron, and carrier is above-mentioned particle one and more than two kinds combinations.The particle diameter of economic benefits and social benefits metallic catalyst active ingredient nano particle is 0.2 nanometer to 100 nanometer.
The preparation method of described URFC fuel cell membrane electrode assembly, comprises the steps:
1) by required form and size, proton exchange membrane, anode, negative electrode are repaired, utilize cutter or mould antianode, the periphery of negative electrode cuts, the periphery of the proton exchange membrane be positioned in the middle of anode, negative electrode is protruded, form circular edge, the width of circular edge is 5 millimeters-10 millimeters, circular edge is processed porose;
2), ring protection frame is made: the profile of the inner side hole shape of bearer bar and described anode, negative electrode and measure-alike, the circumferential width of bearer bar is consistent with the width at the circular edge place of described proton exchange membrane, the one side of bearer bar scribbles bonded adhesives, and another side is for amplexiforming the sealant of fuel cell;
3) transition region protection pad is made: protection pad inner shape is identical with the profile of described anode, negative electrode, but physical dimension 0.2-100 millimeter less of anode, cathode edge; Protection pad outer shape is identical with described bearer bar profile, but physical dimension 0.2-100 millimeter larger than bearer bar outline edge;
4) bonded adhesives side is scribbled upward by a bearer bar, in bearer bar, lay negative electrode or anode, then a transition region protection pad is installed, make transition region protect pad bonding bearer bar and electrode seam crossing simultaneously, and make it be not less than 0.2 millimeter at bearer bar and any lateral extent of electrode, stand-by; The surface, one or both sides of described transition region protection pad scribbles adhesive sticker or PUR;
A bearer bar will scribble bonded adhesives side and be placed on white steel bed die upward, male or female is laid in bearer bar, one transition region protection pad is installed again, transition region is made to protect pad bonding bearer bar and electrode seam crossing simultaneously, and making it be not less than 0.2 millimeter at bearer bar and any lateral extent of electrode, the surface, one or both sides of described transition region protection pad scribbles adhesive sticker or PUR; ; Tile proton exchange membrane more thereon, then be that above-mentioned band bearer bar, transition region protect the negative electrode of pad or anode to be placed in above proton exchange membrane by the plane of symmetry by anode and negative electrode with film; Two bearer bars and the alignment of proton exchange membrane outward flange; Bonded adhesives above bearer bar contacts with the periphery projection of proton exchange membrane, covers white steel mold;
5) make mold, each parts of MEA of bed die and centre thereof are together placed in hydraulic press heating, hot pressing 5-200 second; Formed and have the URFC fuel cell membrane electrode assembly of fuel cell and water electrolysis economic benefits and social benefits functional structure, Stress control is between 0.5-10MPa in the process, and temperature controls between 80-200 DEG C, and time controling is between 5-50 second.
The URFC fuel cell membrane electrode assembly integrated approach with fuel cell and water electrolysis economic benefits and social benefits functional structure of the present invention; the material of wherein said bearer bar is the macromolecular material such as PET or ABS or PP or PC, and the material of described sealant is fluorubber or silicon rubber or polyethylene or polyvinyl chloride: described bonded adhesives is adhesive sticker or thermosol.
Of the present invention have economic benefits and social benefits function URFC fuel cell membrane electrode assembly integrated approach, and the thickness of wherein said bearer bar is 0.1 millimeter-0.2 millimeter; The thickness of described bonded adhesives is 0.005 millimeter-0.01 millimeter: the thickness of described sealant is 0.02 millimeter-0.06 millimeter.
Beneficial effect of the present invention is as follows:
1. the URFC fuel cell membrane electrode assembly integrated approach with fuel cell and water electrolysis economic benefits and social benefits functional structure of the present invention, specific dual purpose catalyst is adopted to combine preparation URFC fuel cell MEA, fuel cell power generation and water electrolysis two processes can be realized respectively in a battery, there is generating and energy storage dual-use function.
2. this battery system height is integrated; Improve MEA pressing process, utilize transition region to protect pad to improve MEA bulk strength, by integral for each component set of component film electrode, increase the shock-resistant ability in MEA edge, improve the reliability of the membrane electrode government form;
3. hot pressing makes URFC pile easy to assembly; reduce labour intensity; enhance productivity; the membrane electrode bearer bar synergy in transition region polymer protection thin slice wherein and outside; MEA is integrated; anode diffusion layer, anode catalyst layer, proton conductive membrane, cathode catalyst layer, cathode diffusion layer is effectively prevented to come off, be shifted, MEA foldover, swelling deformation.
4. the present invention can need to make multi-purpose three-in-one component according to difference, and preparation method is easy, quick, is suitable for suitability for industrialized production.
5. have technique simple, easy and simple to handle, the advantages such as repeatability is strong, can produce in batches.
Accompanying drawing explanation
Fig. 1 is that in method of the present invention, membrane electrode side forms the front schematic view of each;
1-bearer bar 2-transition region seam 3-perforate 4-transition region protection pad 5-gas diffusion layers or electrode
Fig. 2 is that in method of the present invention, membrane electrode side forms the side schematic view of each;
1-proton exchange membrane 2-transition region protection pad 3-bearer bar 4-transition region seam 5-gas diffusion layers or electrode
Fig. 3 is proton exchange membrane and transition region protection pad schematic diagram in method of the present invention;
1-proton exchange membrane 2-transition region protection pad 3-perforate
Fig. 4 is integral type fuel cell open-circuit performance map prepared by method of the present invention;
Fig. 5 is the integral type fuel cell power generation prepared of method of the present invention and water electrolysis performance map.
Embodiment
Embodiment 1
Prepared by electrode
1) be that 30-50 nano titanium powder, the PTFE emulsion of 2mL solid content 5% and 50mL ethanol supersonic oscillations are even by 200 milligrams of particle diameters, then above-mentioned slurry doctor blade method blade coating is prepared microporous layers on titanium fleece, to the gas diffusion layers dry 30min at the temperature of 120,250 DEG C respectively coated be scraped, finally at 340 DEG C of roasting temperature 60min.
2) PTFE emulsion of black to 20 milligrams of platinum black catalyst, 20 milligrams of iridium, 2mL solid content 5% and 50mL isopropyl alcohol ultrasonic wave are stirred evenly; then by the even blade coating of this slurry doctor blade method in 1) on the gas diffusion layers that prepared; dry 30min at 120,250 DEG C of temperature respectively under nitrogen protection condition, finally at 340 DEG C of roasting temperature 60min.
3) electrode three-dimensional is carried out, according to electrode area, take Nafion resin (the trade name Nafion of 6mL, DE1020, produced by DuPont, comprise the perfluorinated sulfonic resin of 10wt%) solution, add the isopropyl alcohol of 20mL, after stirring evenly, it is sprayed on equably the Catalytic Layer side of above-mentioned electrode, drying is weighed.Pt carrying capacity 0.5mg/cm on control electrode
2, Ir carrying capacity 0.5mg/cm
2, Nafion carrying capacity 0.6mg/cm
2, the electrode made is for subsequent use.
Embodiment 2
Prepared by MEA
Assembling position see electrode, proton exchange membrane and bearer bar in accompanying drawing 1-Fig. 3 and transition region protection pad prepares membrane-electrode assembly.
Concrete preparation method comprises the steps:
1), to by proton exchange membrane and be positioned at the anode of proton exchange membrane both sides, membrane electrode assembly that negative electrode forms processes, utilize cutter or mould antianode, the periphery of negative electrode cuts, the periphery being positioned at middle proton exchange membrane is protruded, and the width of protrusion is 0.5 millimeter-100 millimeters;
2), bearer bar is made; the inner side hole shape of bearer bar is identical with the profile of described anode, negative electrode; the circumferential width of bearer bar is consistent with the width that used proton exchange membrane periphery protrudes, and the one side of bearer bar is connected to sealant, and another side scribbles bonded adhesives.
3), make transition region protection pad, protection pad inner shape is identical with the profile of used anode, negative electrode, but physical dimension 0.2-100 millimeter less of anode, cathode edge.Protection pad outer shape is identical with used bearer bar inner shape, but physical dimension 0.2-100 millimeter larger than bearer bar inside edge.
4), by the sealant on bearer bar down and be placed on white steel bed die; respectively anode complete for cutting, negative electrode are placed in bearer bar; transition region protection pad is installed respectively; transition region protection pad bonding bearer bar and electrode seam crossing simultaneously, and be not less than 0.2 millimeter at bearer bar and any lateral extent of electrode.Be placed on bed die by the bearer bar/anode electrode of the transition region protection pad that bondd, proton exchange membrane tiling in, then the tiling transition region that bondd protects the bearer bar/cathode electrode of pad, and two bearer bars and proton exchange membrane outward flange align.Cover white steel mold.
5), by by bearer bar, proton exchange membrane and be positioned at the anode catalyst layer of proton conductive membrane both sides, five layer membrane electrode assemblys that anode diffusion layer, cathode catalyst layer, cathode diffusion layer form are placed on hydraulic press lower bolster and heat, hot pressing 10-240 second.Form the URFC fuel cell membrane electrode assembly with fuel cell and water electrolysis economic benefits and social benefits functional structure, Stress control is between 0.5-10MPa in the process, and temperature controls between 80-200 DEG C, and the time preferably controls between 30-60 second, then take out MEA, cool stand-by.
Embodiment 3
Battery pack is assembled
Concrete grammar is as follows: first respectively sealing ring is enclosed within proton exchange membrane on the both sides of membrane electrode (MEA), secondly cathode flow field plate and anode flow field board is placed on respectively the both sides of membrane electrode, and three portion compresses just form a monocell.Multiple same cells in series, is namely assembled into battery pile.Again two panels copper sheet (playing afflux) is placed on respectively the both sides of first and last two batteries, is finally fixed up by fixed head and key screw battery pile again, has so just been assembled into a battery pile.After examine battery pile air-tightness is qualified, just battery performance test can be carried out.
Embodiment 4
Battery pack is tested
The present invention we the pile assembled be made up of 30 joint monocells, monocell work area is 100cm2, and anode uses Pt/C to make eelctro-catalyst, and Pt carrying capacity is 0.5mg/cm2, and negative electrode uses the made electrode of embodiment 1.Proton exchange membrane uses Nafion 1135 film of Dupont company, bipolar plates is silver-plated white steel plate, adopt machine work engraving air flue, use silica gel sealing linear sealing mode that each joint monocell is assembled into pile, can ensure that the sealing of pile can make again electrode have even impression, reduce the contact resistance of battery.Water plate to pile passes into cooling water, the used heat produced when discharging battery operated, keeps battery in proper temperature work.
During biofuel cell mode work, first using hydrogeneous 3% detection nitrogen and dry air as detection, gas, keeping detecting nitrogen and air pressure is 0-0.2MPa, carries out open circuit performance test to this pile.Concrete test result is shown in Fig. 4, and the detection nitrogen using hydrogeneous 3% and dry air are as detection gas test battery open circuit, and pile Nei Gejie opens a way evenly, and average open circuit is at about 0.85V; Open a way using pure hydrogen and oxygen as reaction gas test battery, pile Nei Gejie opens a way evenly, and average open circuit is at about 0.95V, and pile comparison of coherence is good.
Then using pure hydrogen and oxygen as reaction gas, pile humidification temperature H is respectively controlled
2be 70 DEG C, O
2be 70 DEG C, circulating water outlet temperature is, 70-75 DEG C, keeps H
2with O
2pressure ratio is 0.2MPa/0.2MPa, carries out volt-ampere curve performance test to this pile.
During water electrolysis work pattern, in battery pack, pass into high purity water, the flow velocity of water is 10mL/min, and controlling stack temperature is 70 DEG C, and circulating water outlet temperature is 70-75 DEG C, keeps the H produced
2with O
2pressure ratio is 0.2MPa/0.2MPa, carries out electrolysis performance test to this pile.Concrete test result is shown in Fig. 5, tentatively reaches Patent design requirement, and can realize fuel cell power generation and water electrolysis two processes in a battery respectively, during fuel cell power generation work pattern, during discharging current 50A, discharge voltage is greater than 20V; During water electrolysis work pattern, during charging current 50A, charging voltage is less than 49V.And solve that MEA is yielding in fuel cell power generation and water electrolysis process, unstable, the problem of male-female very easily gas blowby, the MEA reliability of preparation is improved.
Although provide particularly with reference to exemplary and describe the present invention; under the condition not deviating from scope of the present invention and principle; various amendment of the present invention and replacement are understandable to one skilled in the art; do not departing from various inventions, the design of defined in patent claims book; still the various changes that the present invention is made on pattern can be regarded as; should be subject to patent protection, the present invention is not restricted to illustrative embodiments mentioned above.
Claims (6)
1. a preparation method for integral regeneratable fuel cell membrane-electrode assembly, sub-assembly comprises dielectric film, the anode being arranged at dielectric film both side surface respectively and negative electrode; Be provided with the bearer bar of ring-type in two sides of dielectric film, anode and negative electrode lay respectively at the circular hollow place of bearer bar, it is characterized in that: the transition region being provided with ring-type in the intersection of the inside edge of ring protection frame and anode and negative electrode protects pad; The shape of protection pad is identical with the shape of bearer bar, neonychium sheet ring-type hollow bulb part size is less than the hollow part size of corresponding section bearer bar, the outer size peripherally located of protection pad is greater than the hollow part size of corresponding section bearer bar, make the surrounding outer ledge of protection pad part be between dielectric film and bearer bar, make the surrounding inside edge of protection pad part be in intersection anode and negative electrode on; It is characterized in that: comprise the steps:
1) by required form and size, dielectric film, anode, negative electrode are repaired, utilize cutter or mould antianode, the periphery of negative electrode cuts, the periphery of the dielectric film be positioned in the middle of anode, negative electrode is protruded, form circular edge, the width of circular edge is 0.5 millimeter-10 millimeters, circular edge is processed porose;
2), ring protection frame is made: the profile of the inner side hole shape of bearer bar and described anode, negative electrode and measure-alike, the circumferential width of bearer bar is consistent with the width at the circular edge place of described dielectric film, the one side of bearer bar scribbles bonded adhesives, and another side is for amplexiforming the sealant of fuel cell;
3), transition region protection pad is made: protection pad inner shape is identical with the profile of described anode, negative electrode, but physical dimension 0.2-100 millimeter less of anode, cathode edge; Protection pad outer shape is identical with described bearer bar profile, but physical dimension 0.2-100 millimeter larger than bearer bar outline edge;
4), bonded adhesives side is scribbled upward by a bearer bar, negative electrode or anode is laid in bearer bar, one transition region protection pad is installed again, makes transition region protect pad bonding bearer bar and electrode seam crossing simultaneously, and make it be not less than 0.2 millimeter at bearer bar and any lateral extent of electrode; Stand-by; The surface, one or both sides of described transition region protection pad scribbles adhesive sticker or PUR;
A bearer bar will scribble bonded adhesives side and be placed on white steel bed die upward, male or female is laid in bearer bar, one transition region protection pad is installed again, transition region is made to protect pad bonding bearer bar and electrode seam crossing simultaneously, and making it be not less than 0.2 millimeter at bearer bar and any lateral extent of electrode, the surface, one or both sides of described transition region protection pad scribbles adhesive sticker or PUR; Tile dielectric film more thereon, then be that above-mentioned band bearer bar, transition region protect the negative electrode of pad or anode to be placed in above dielectric film by the plane of symmetry by anode and negative electrode with film; Two bearer bars and the alignment of dielectric film outward flange; Bonded adhesives above bearer bar contacts with the periphery projection of dielectric film, covers white steel mold;
5), make mold, each parts of MEA of bed die and centre thereof are together placed in hydraulic press heating, hot pressing 5-120 second; Formed and have the URFC fuel cell membrane electrode assembly of fuel cell and water electrolysis economic benefits and social benefits functional structure, Stress control is between 0.5-10MPa in the process, and temperature controls between 80-200 DEG C, and time controling is between 5-50 second.
2. preparation method according to claim 1, is characterized in that: the material of described bearer bar is PBI, PET, ABS, PP or PC macromolecular material; The thickness of described bearer bar is 0.1 millimeter-0.5 millimeter; The thickness of described bonded adhesives is 0.005 millimeter-0.2 millimeter;
The material of described transition region protection pad is PBI, PET, ABS, PP, PC, fluorubber, silicon rubber, polyethylene or polyvinyl chloride macromolecular material, and the one or both sides of described transition region protection pad scribble adhesive sticker or thermosol; The thickness of described transition region protection pad is 2-200 μm.
3., according to the preparation method of fuel cell membrane-electrode assembly according to claim 1, it is characterized in that:
The catalyst layer containing dual purpose catalyst is comprised respectively in described anode and negative electrode, dual purpose catalyst in described dual purpose catalyst layer is that load or non-load are at supported catalyst, two metalloid catalyst granuless combinations of the active ingredient of catalyst to be particle diameter be 0.2 nanometer to 200 nanometer, the layer thickness of described catalyst layer is less than or equal to 200 μm;
Wherein a class particle is selected from more than one in the simple metal nano particle of Pt, Pd, Ru, Rh, Ir;
Wherein another kind of particle is selected from Ru, Rh, Ir, RuO
2, RhO
2, IrO
2more than one of nano particle.
4., according to the preparation method of fuel cell membrane-electrode assembly according to claim 3, it is characterized in that:
The carrier that the dual purpose catalyst of described load adopts is: the titanium valve of nanometer and/or micron, iridium powder, ruthenium powder, rhodium powder, iridium dioxide, titanium oxide, ruthenic oxide, rhodium dioxide, conductivity ceramics, silicon nitride, carborundum, silicon dioxide, boron nitride, boron carbide, boron oxide, tungsten carbide particle, and carrier is above-mentioned particle one and more than two kinds combinations.
5., according to the preparation method of fuel cell membrane-electrode assembly according to claim 3, it is characterized in that:
The particle diameter of dual purpose catalyst active ingredient nano particle is 1 nanometer to 100 nanometer.
6. according to the preparation method of fuel cell membrane-electrode assembly according to claim 3, it is characterized in that: the described catalyst layer containing catalyst also comprises electrolyte resin; Wherein this electrolyte resin comprises the one in the fluoropolymer resin its side chain with the cation exchange group being selected from sulfonic group, carboxylic acid group, phosphate or phosphonate group and derivative thereof.
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| CN104167557B (en) * | 2014-08-27 | 2016-05-04 | 中国科学院大连化学物理研究所 | A kind of high-temperature fuel cell membrane electrode and assemble method thereof |
| CN106876753B (en) * | 2015-12-12 | 2019-05-21 | 中国科学院大连化学物理研究所 | The preparation method of fuel cell with orderly pore structure electrode |
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| CN113140768B (en) * | 2021-04-12 | 2022-03-18 | 上海交通大学 | Cathode side structure of integrated reversible fuel cell membrane electrode |
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