JP2006252983A - Fuel composition for fuel cell, fuel cell power generation system and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid fuel composition, of which the output of a fuel cell can be fully obtained, even when a liquid fuel is used as a fuel of the fuel cell, and to provide a fuel cell power generation system and its operation method capable of obtaining sufficient output. <P>SOLUTION: A liquid fuel composition, containing an acetylene-glycol system surfactant, is used as the liquid fuel for the fuel cell. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel composition for a fuel cell, a fuel cell power generation system, and an operation method thereof.

  There are several types of fuel cells, but direct methanol fuel cells have the feature that they can generate electricity by directly supplying liquid as it is without taking out hydrogen gas by reforming methanol aqueous solution as fuel. Yes. Therefore, compared with conventional polymer electrolyte fuel cells that supply fuel by gasification or reforming, the structure as a power generation system is simple, and it is easy to reduce the size and weight. Its use as a power source has attracted attention.

  Such a direct methanol fuel cell uses a proton conductive solid polymer membrane as an electrolyte membrane, and a cathode and an anode formed by applying a catalyst onto porous carbon paper serving as a diffusion layer via the electrolyte membrane. An anode electrode side separator having a flow channel for supplying a methanol aqueous solution as a fuel is provided on the anode electrode side, and a flow for supplying air as an oxidant gas is provided on the cathode electrode side. A structure is provided in which a cathode electrode side separator having a channel groove is provided (see Patent Document 1).

When an aqueous methanol solution is supplied to the anode electrode and air is supplied to the cathode electrode, carbon dioxide gas is generated by the oxidation reaction of methanol and water at the anode electrode, and hydrogen ions and electrons are released (CH ₃ OH + H ₂ O → CO _2). + 6H ⁺ + 6e ⁻ ), and at the cathode electrode, water is generated by the reduction reaction between the hydrogen ions that have passed through the electrolyte membrane and air (6H ⁺ + (3/2) O ₂ + 6e ⁻ → 3H ₂ O). Electrical energy can be obtained in the external circuit by connecting the cathode and anode. Therefore, the total reaction of the direct methanol fuel cell is a reaction in which water and carbon dioxide are generated from methanol and oxygen.

  It is known that the electrode is treated with a water repellent such as a fluororesin in order to improve the diffusion of carbon dioxide gas generated at the anode electrode and the air supplied to the cathode electrode (see Patent Document 2).

The fuel composition for a fuel cell described in Patent Document 3 contains a fuel containing a C 1-3 alcohol and water and a surfactant. This fuel composition for a fuel cell improves the wettability between the liquid fuel and a capillary inside the porous plate of the fuel cell by adding a surfactant to the liquid fuel made of an aqueous alcohol solution, and the liquid fuel by capillary action It is intended to improve the fuel supply by easily sucking up the fuel cell, and to reduce the startup time of the liquid fuel cell.
JP 2004-39556 A Japanese Patent Application Laid-Open No. 5-283082 JP 2001-93558 A

  The water-repellent treatment of the catalyst layer and current collecting layer constituting the electrode of the fuel cell improves the diffusion of the carbon dioxide gas generated by the oxidation reaction between methanol and water and the air supplied to the cathode electrode. It is important to improve the output. However, when a liquid fuel is used as the fuel for the fuel cell, there is a problem that wettability at the interface between the liquid that is the fuel and the catalyst layer is impaired and a sufficient output cannot be obtained.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel composition capable of sufficiently obtaining the output of the fuel cell even when liquid fuel is used as the fuel for the fuel cell. It is another object of the present invention to provide a fuel cell power generation system capable of obtaining sufficient output and an operation method thereof.

  The above object can be achieved by the following means.

  The fuel composition for a fuel cell according to claim 1 is characterized by containing a liquid fuel and an acetylene glycol surfactant.

  The fuel composition for a fuel cell according to claim 2 is the fuel composition for a fuel cell according to claim 1, wherein the liquid fuel is alcohol having 1 to 3 carbon atoms and water. Is.

  The fuel composition for a fuel cell according to claim 3 is the fuel composition for a fuel cell according to claim 2, wherein the content of the alcohol is 10 to 40% by mass with respect to the fuel. It is what.

  The fuel composition for a fuel cell according to claim 4 is the fuel composition for a fuel cell according to any one of claims 1 to 3, wherein the acetylene glycol surfactant is represented by the following general formula: It is characterized by being a compound.

In the formula, 0 ≦ m + n ≦ 50, and R ¹ , R ² , R ³ and R ⁴ each represents an alkyl group.

  A fuel cell power generation system according to claim 5 is a fuel cell power generation system comprising a fuel cell configured by sandwiching an electrolyte membrane between an anode electrode and a cathode electrode, and a fuel container for storing liquid fuel. The fuel is the fuel composition for a fuel cell according to any one of claims 1 to 4, and the anode electrode contains a fluorine-based resin.

  A method for operating a fuel cell power generation system according to claim 6 uses the fuel composition for a fuel cell according to any one of claims 1 to 4 as a liquid fuel, which is used as an anode electrode containing a fluorine resin, The fuel cell is directly supplied to a fuel cell configured by sandwiching an electrolyte membrane with a cathode electrode.

  That is, in the case of an electrode of a fuel cell having a fine structure, the present inventors have found that the penetration of liquid fuel into the electrode has a great effect of dynamic surface tension, and the liquid fuel contains an acetylene glycol surfactant. The inventors have thought that the performance of the fuel cell may be improved, and have reached the present invention.

  By using the fuel composition for a fuel cell of the present invention, the output of the fuel cell is improved. Moreover, according to the fuel cell power generation system and the operation method of the fuel cell power generation system of the present invention, a high output can be maintained for a long period of time.

  In the fuel composition for a fuel cell of the present invention, examples of the fuel include alcohols, ethers, hydrazine and the like. Preferred are alcohols, specifically, alcohol having 1 to 3 carbon atoms and water. Examples of the alcohol having 1 to 3 carbon atoms include methanol, ethanol, isopropanol, and 1-propanol. The alcohol content is preferably 1 to 80% by mass, more preferably 5 to 40% by mass, based on the entire fuel composed of alcohol and water. When the alcohol content is less than 1% by mass, the liquid fuel container becomes too large, and it is difficult to reduce the size. If it exceeds 80% by mass, the water component, which is the other component of the fuel, is reduced, which may make it difficult for the cell reaction to occur. The content of water which is the other component of the fuel can be appropriately determined according to the amount of such alcohol.

  In the present invention, the acetylene glycol surfactant preferably has an average molecular weight of 250 or less. Moreover, what reduces a dynamic surface tension to 40 mN / m or less is preferable.

  Preferable compounds include acetylene glycol surfactants represented by the following general formula.

In the formula, 0 ≦ m + n ≦ 50, and R ¹ , R ² , R ³ and R ⁴ each represents an alkyl group.

  The compounds represented by the above formula are commercially available. Specifically, Olfin Y, Surfinol 82, Surfinol 104, Surfinol 440, Surfinol 465, Surfinol 485, Dinol 604 (all manufactured by Air Products and) Chemicals. Inc.). These can be used alone or in combination of two or more.

  The amount of the acetylene glycol surfactant added to the fuel composition for a fuel cell of the present invention may be about 0.01 to 0.5% by mass, preferably 0.4 to 0.5% by mass, based on the fuel composition. %.

  The fuel composition for a fuel cell of the present invention can be supplied by mixing the liquid fuel and the acetylene glycol surfactant in separate containers and mixing them immediately before being supplied to the fuel cell.

  When the amount of alcohol contained in the fuel composition of the present invention exceeds 30% by mass of the whole fuel, it does not freeze even at a low temperature (below freezing point of 40 ° C.). When the amount is 30% by mass or less, it is preferable to add an antifreeze liquefying agent to make the fuel composition antifreeze.

  As the antifreezing agent, a polyhydric alcohol or a derivative thereof can be used. The addition amount of the antifreeze liquefying agent is preferably in the range of 0.1% by mass to 10% by mass with respect to the fuel.

  Examples of the polyhydric alcohol and derivatives thereof include ethylene glycol, diethylene glycol, glycerin, propylene glycol, ethylene glycol monomethyl ether, diglyme, polyoxyethylene oligomer, and polyoxypropylene oligomer.

  Next, a fuel cell to which the fuel composition for a fuel cell of the present invention is applied will be described with reference to the drawings.

  FIG. 1 is a schematic view of a fuel cell to which the fuel composition for a fuel cell of the present invention is applied. The fuel cell shown in FIG. 1 basically contains a liquid fuel containing a fuel composition 2 for the fuel cell (for example, methanol and water, a fungicide or a disinfectant, and an antifreeze liquefaction agent if necessary). The container 1 includes a fuel cell stack body 8, an introduction pipe 5 for introducing the fuel composition 2 from the fuel storage container 1 to the fuel cell stack body 8, and a fuel introduction path 6. Usually, an air supply / intake mechanism (not shown) such as a fan for supplying an oxidant gas is also provided. The illustrated fuel cell stack body 8 includes a plurality of unit cells 7 each having a fuel electrode (also referred to as an anode electrode), an oxidant electrode (also referred to as a cathode electrode), and an electromotive portion having an electrolyte membrane sandwiched between the two electrodes. It is a structure that includes a stacked. The unit cell 7 can also be used in a single layer without being stacked.

  In FIG. 1, the introduction tube 5 can be formed of a thin tube having a capillary action. Alternatively, the introduction pipe 5 may be filled with a porous material that allows the fuel composition 2 to permeate for the purpose of assisting the introduction of the fuel composition 2. As such a liquid osmotic material, for example, a porous material such as a sponge such as polyurethane, polyester, cellulose, or phenolic resin can be used.

  As shown in the drawing, the fuel container 1 is connected to the introduction pipe 5 at the connection portion 4, and the connection portion 4 is desirably sealed. This is because the fuel may be volatilized when the sealing of the connecting portion 4 is insufficient.

  The fuel composition 2 introduced into the fuel cell stack body 8 from the introduction pipe 5 passes through the molecular filtration membrane 3 and is referred to as a fuel introduction path 6 in order to stably and stably supply the unit cells 7 in the stack. Guided to holding material.

  FIG. 2 is a cross-sectional view showing the main configuration of the unit cell 7. As shown in the figure, an anode electrode 72, an electrolyte membrane 73, and a cathode electrode 74 are disposed between a fuel permeation layer 71 and a separator 75 to constitute a unit cell 7.

  Here, the anode electrode 72 and the cathode electrode 74 are formed of a conductive porous body so that the fuel composition 2 and the oxidant gas can be circulated and electrons can pass therethrough. Further, a fuel permeation layer 71 for introducing the fuel composition 2 into the battery by capillary force is provided. An oxidant gas supply groove 76 for flowing an oxidant gas is provided as a continuous groove on the surface of the separator 75 in contact with the cathode electrode 74. By having the separator 75 also have a function as a channel through which the oxidizing gas flows, the number of parts of the battery can be reduced.

  As a means for supplying the fuel composition 2 from the liquid fuel container 1 to the fuel permeation layer 71, for example, the fuel introduction path 6 is formed in the fuel cell stack body 8. The fuel composition 2 introduced into the fuel introduction path 6 is supplied to the fuel permeation layer 71 by capillary force. The form of the fuel permeation layer 71 is not particularly limited as long as it can permeate the fuel composition 2 by capillary force, and is a porous body composed of particles and fillers, a nonwoven fabric manufactured by a papermaking method, or the like. A woven fabric or the like woven can be used. The fuel permeation layer 71 is preferably closer to the electrolyte membrane 73 and is preferably set so that the capillary force is increased by reducing the capillary hole diameter.

  The separator 75 and the fuel permeation layer 71 are formed of a conductive material so as to function as a current collecting layer that conducts generated electrons. Further, a catalyst layer may be formed between the anode electrode 72 or the cathode electrode 74 and the electrolyte membrane 73, or the anode electrode 72 or the cathode electrode 74 itself may be used as a catalyst electrode. The catalyst electrode may be a catalyst layer alone or may have a multilayer structure in which a catalyst layer is formed on a support such as conductive paper or cloth.

  As the electrolyte membrane, a solid polymer electrolyte membrane having proton conductivity is preferable, and sulfonated polyimide polymer electrolyte membranes, fluorine polymer electrolyte membranes, hydrocarbon polymer electrolyte membranes, composite materials, etc. are used. can do. For example, as the hydrocarbon polymer electrolyte material, sulfonated engineering plastic electrolytes such as sulfonated polyetherketone, sulfonated polyethersulfone, sulfonated polyetherethersulfone, sulfonated polysulfone, sulfonated polysulfide, and sulfonated polyphenylene, Examples include sulfoalkylated engineering plastic electrolytes such as sulfoalkylated polyetheretherketone, sulfoalkylated polyethersulfone, sulfoalkylated polyetherethersulfone, sulfoalkylated polysulfone, sulfoalkylated polysulfide, and sulfoalkylated polyphenylene.

  As the catalyst for the anode and cathode, known catalysts can be used, for example, noble metal catalysts such as platinum, palladium, ruthenium, iridium, gold, platinum-ruthenium, iron-nickel-cobalt-molybdenum-platinum, etc. An alloy is used.

  The anode and cathode catalyst layers preferably contain an electronic conductor (conductive material) material for the purpose of improving conductivity. The electron conductor (conductive material) is not particularly limited, but an inorganic conductive material is preferably used from the viewpoints of electron conductivity and touch resistance. Among these, carbon black, graphite or carbonaceous carbon material, metal or metalloid can be mentioned. Here, as the carbon material, carbon black such as channel black, thermal black, furnace black, and acetylene black is preferably used from the viewpoint of electron conductivity and specific surface area. In particular, it is used as an electron conductor (conductive material) carrying a catalyst, such as platinum-carrying carbon. The catalyst layer preferably contains a proton conductive electrolyte material. The electrolyte is not particularly limited as long as it is an electrolyte having ion conductivity used for a solid polymer electrolyte membrane having proton conductivity, and examples thereof include a fluorine-based electrolyte material, a partial fluorine-based electrolyte material, and a hydrocarbon-based electrolyte material. The ratio of the noble metal catalyst-supported carbon and the polymer electrolyte in the catalyst layer should be appropriately determined according to the required electrode characteristics, and is not particularly limited. The mass ratio is preferably 5/95 to 95/5, and more preferably 40/60 to 85/15.

  The support that supports the anode and cathode catalyst layers, that is, the electrode substrate, can be used without particular limitation as long as it has a low electrical resistance and can collect current. Examples of the constituent material of the electrode base material include those mainly composed of a conductive substance. Examples of the conductive substance include a fired body from polyacrylonitrile, a fired body from pitch, and carbon such as graphite and expanded graphite. Examples include raw materials, the aforementioned nanocarbon materials, stainless steel, molybdenum, and titanium.

In the fuel cell power generation system of the present invention, the anode electrode of the fuel cell contains a fluorine-based resin.
Formula _{CF 2 = CF- (OCF 2 CFX} ) m-Oq- (CF 2) n-A
(Wherein, m = 0 to 3, n = 0 to 12, q = 0 or 1, X = F or CF ₃ , A = sulfonic acid type functional group), tetrafluoroethylene, hexafluoro And copolymers with perfluoroolefins such as propylene, chlorotrifluoroethylene or perfluoroalkyl vinyl ether. Preferred examples of Furorobiniru compounds, for _{example, CF 2 = CFO (CF 2} ) aSO 2 F, CF 2 = CFOCF 2 CF (CF 3) O (CF 2) aSO 2 F, CF 2 = CF (CF 2) bSO ₂ F, CF ₂ = CF (OCF ₂ CF (CF ₃ )) cO (CF ₂ ) ₂ SO ₂ F (where a = 1 to 8, b = 0 to 8, c = 1 to 5) Can be mentioned.

  In the present invention, a catalyst layer other than the anode electrode and a support that supports the catalyst layer can contain a water repellency imparting agent for improving water repellency. Examples of water repellency-imparting agents include fluorine-containing resins such as polytetrafluoroethylene (PTFE) such as Teflon (registered trademark), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and tetrafluoroethylene-hexafluoropropylene copolymer. Is mentioned.

  In addition, a compound having an antibacterial action such as titanium oxide can be contained in a layer constituting the anode electrode or the cathode electrode such as a catalyst layer of the anode electrode or the cathode electrode or a support for supporting the catalyst layer.

  As a method for supplying the liquid fuel to the fuel cell, either a passive type using capillary force or an active type using liquid feeding means such as a pump may be used. When a high output is required, an active type is preferable, and it is preferable that the cathode side also has a raw material supply means such as a pump for sending oxygen or air as an oxidizing agent. The fuel supply speed is appropriately determined depending on the size of the electrode of the fuel cell.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these.

Example 1
[Production of catalyst-supported carbon]
(Platinum-supported carbon for cathode electrode)
9 g of acetylene black and 200 g of pure water are mixed. Subsequently, 1 g of chloroplatinic acid aqueous solution is added as platinum, and it heats up to 60 degreeC. After the temperature became constant, the pH was adjusted to 10 with a 2 mol / l sodium hydroxide solution, and a 3% by mass hydrazine solution was added dropwise to reduce chloroplatinic acid. After completion of the reduction, platinum-supported carbon was obtained by filtering and washing with a glass filter and drying. The amount of platinum supported on this carbon was 20% by mass.

(Platinum ruthenium-supporting carbon for anode electrode)
Platinum ruthenium-supporting carbon for anode electrode was prepared in the same manner as the preparation of platinum-supporting carbon for cathode electrode. However, in this case, platinum-ruthenium-supported carbon powder was obtained by using 1.2 g of chloroplatinic acid as platinum and 1 g of ruthenium chloride as ruthenium instead of 1 g of chloroplatinic acid as platinum. The amount of platinum supported on this carbon was 20% by mass.

[Preparation of electrode paste]
(Preparation of anode electrode paste-1)
Platinum-ruthenium-supported carbon powder, distilled water, 60% by mass Teflon (registered trademark) dispersion, 5% by mass Nafion solution (manufactured by Aldrich) are used as solids so that the amount of Teflon (registered trademark) is 12% by mass. Anode paste 1 was prepared by mixing and uniformly dispersing with ultrasonic waves.

(Preparation of anode electrode paste-2)
Anode electrode paste-2 was prepared in the same manner as anode electrode paste-1, except that the anode electrode paste-1 was mixed so that the amount of Teflon (registered trademark) was 8% by mass. Was made.

(Preparation of anode electrode paste-3)
Anode electrode paste-2 was prepared in the same manner as anode electrode paste-1, except that the anode electrode paste-1 was mixed so that the amount of Teflon (registered trademark) was 0% by mass. Was made.

(Preparation of cathode electrode paste)
A cathode electrode paste was prepared in the same manner as the anode electrode paste-1 except that the platinum-ruthenium-supported carbon powder was replaced with a platinum-supported carbon powder in preparation of the anode electrode paste-1.

[Preparation of support for supporting catalyst layer]
(Production of water repellent carbon paper)
Carbon paper having a porosity of 75% and a thickness of 0.4 mm is immersed in Teflon (registered trademark) dispersion PTFE31-J (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.), and 0.5 mg / cm ² of Teflon (registered trademark) is placed on the surface. A water-repellent carbon paper was prepared by applying.

[Production of electrodes]
(Preparation of anode electrode-1)
On the surface of the water repellent treated carbon paper prepared above, the anode electrode paste-1 prepared above was uniformly applied so that the amount of platinum was 3.0 mg, and dried at 80 ° C. for 1 hour in a nitrogen atmosphere. Pole-1 was produced.

(Preparation of anode-2)
The anode electrode paste-2 prepared above was uniformly applied to the surface of the water-repellent treated carbon paper prepared above so that the amount of platinum was 3.0 mg, and dried at 80 ° C. for 1 hour in a nitrogen atmosphere. Pole-2 was produced.

(Preparation of anode electrode-3)
The anode electrode paste-3 prepared above was uniformly applied to the surface of the water-repellent treated carbon paper prepared above so that the amount of platinum was 3.0 mg, and dried at 80 ° C. for 1 hour in a nitrogen atmosphere. Pole-3 was produced.

(Production of cathode electrode)
The cathode electrode paste prepared above is uniformly applied to the surface of the water-repellent treated carbon paper prepared above so that the amount of platinum is 3.0 mg, and dried at 80 ° C. for 1 hour in a nitrogen atmosphere to form the anode electrode. Produced.

[Preparation of electrolyte membrane-electrode assembly]
(Preparation of electrolyte membrane-electrode assembly-1)
A Nafion 112 membrane (manufactured by DuPont) was sandwiched between the anode 1 and the cathode prepared as described above. These were hot-pressed and bonded at 140 ° C. for 5 minutes at a pressure of 100 kg / cm ² to prepare an electrolyte membrane-electrode assembly-1 as an electromotive part.

(Preparation of electrolyte membrane-electrode assembly-2)
A Nafion 112 membrane (manufactured by DuPont) was sandwiched between the anode electrode-2 and the cathode electrode prepared above. These were hot-pressed at 140 ° C. for 5 minutes at a pressure of 100 kg / cm ² to join them, and an electrolyte membrane-electrode assembly-2 as an electromotive part was produced.

(Preparation of electrolyte membrane-electrode assembly-3)
A Nafion 112 membrane (manufactured by DuPont) was sandwiched between the anode 3 and the cathode prepared as described above. These were hot-pressed at 140 ° C. for 5 minutes at a pressure of 100 kg / cm ² to join them, and an electrolyte membrane-electrode assembly-3 as an electromotive part was produced.

[Fabrication of fuel cell]
(Fabrication of fuel cell-1)
A holder as a cathode electrode side separator in which the electrolyte membrane-electrode assembly-1 obtained above and a carbon porous plate (porosity 40%) as a fuel permeation layer are laminated and provided with an oxidant gas supply groove A fuel cell-1 was prepared by placing it between the anode electrode holder and the anode electrode side holder.

(Fabrication of fuel cell-2)
Fuel cell-2 was produced in the same manner as in production of fuel cell-1, except that electrolyte membrane-electrode assembly-2 was used instead of electrolyte membrane-electrode assembly-1.

(Fabrication of fuel cell-3)
A fuel cell-3 was produced in the same manner as in the production of the fuel cell-1, except that the electrolyte membrane-electrode assembly-3 was used instead of the electrolyte membrane-electrode assembly-1.

[Fuel cell performance evaluation]
The fuel composition shown in Table 1 is supplied to the anode side and air is supplied to the cathode side under the conditions of a temperature of 60 ° C. and a fuel flow rate of 2 ml / min and an air flow rate of 10 ml / min at atmospheric pressure. The current-voltage characteristics were measured.

  Evaluation was performed by the following method.

  Control: As a fuel, a water-methanol solution containing 10% by mass of methanol (containing no surfactant) was used.

  Comparison: As a fuel, a water-methanol solution containing 10% by mass of methanol (containing 0.1% by mass of the comparative surfactant described in Table 1) was used.

  The present invention: As a fuel, a water-methanol solution containing 10% by mass of methanol (containing 0.1% by mass of an acetylene glycol surfactant described in Table 1) was used.

  The dynamic surface tension was measured using a dynamic surface tension meter BP-D4 (manufactured by Kyowa Interface Science Co., Ltd.) with a bubble generation rate of 6 / second.

  The fuel cell was installed in a constant temperature room at 35 ° C., and electric power was generated continuously for 50 hours. The battery performance was evaluated by measuring the current density at a voltage of 0.4 V at the initial stage of power generation, 30 hours after the start of power generation, and 50 hours after the start of power generation.

  The results are shown in Table 1.

  From the results in Table 1, it is clear that the output of the fuel cell is improved by using the fuel composition for the fuel cell of the present invention (from the results of the initial cell performance in Table 1).

  Further, according to the fuel cell power generation system and the operation method of the fuel cell power generation system of the present invention, it is also clear that a high output can be maintained over a long period of time (as liquid fuels, the present samples 1 and 2) From the results of the cell performance after 30 hours and 50 hours using the fuel cells 1 and 2 as the fuel cell.)

(Example 2)
A fuel cell stack body was prepared by laminating 10 fuel cells-1 produced in Example 1 as single cells, and the fuel cell stack body was set as shown in FIG. In the same manner as in Example 1, five types of liquid fuels were applied for experiments. The same tendency as the result obtained with the single battery of Example 1 was confirmed.

It is the schematic of the fuel cell to which the fuel composition for fuel cells of this invention is applied. It is sectional drawing which shows the principal part structure of a cell.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid fuel container 2 Fuel composition 3 Molecular filtration membrane 4 Connection part 5 Introducing pipe 6 Fuel introduction path 7 Single cell 71 Fuel penetration layer 72 Anode electrode 73 Electrolyte membrane 74 Cathode electrode 75 Separator 76 Oxidant gas supply groove 8 Fuel cell Stack body

Claims (6)

A fuel composition for a fuel cell, comprising a liquid fuel and an acetylene glycol surfactant. 2. The fuel composition for a fuel cell according to claim 1, wherein the liquid fuel is an alcohol having 1 to 3 carbon atoms and water. The fuel composition for a fuel cell according to claim 2, wherein the alcohol content is 10 to 40 mass% with respect to the fuel. The fuel composition for a fuel cell according to any one of claims 1 to 3, wherein the acetylene glycol surfactant is a compound represented by the following general formula.

In the formula, 0 ≦ m + n ≦ 50, and R ¹ , R ² , R ³ and R ⁴ each represents an alkyl group. In a fuel cell power generation system comprising a fuel cell configured by sandwiching an electrolyte membrane between an anode and a cathode, and a fuel container for storing liquid fuel,
5. The fuel cell power generation system according to claim 1, wherein the liquid fuel is a fuel composition for a fuel cell according to claim 1, and the anode electrode contains a fluorine-based resin. A fuel cell comprising the fuel composition for a fuel cell according to any one of claims 1 to 4 as a liquid fuel, wherein the electrolyte membrane is sandwiched between an anode electrode and a cathode electrode containing a fluorine-based resin. A method of operating a fuel cell power generation system, characterized in that the fuel cell power generation system is directly supplied to a fuel cell.

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