KR20080041846A - Membrane-electrode assembly for fuel cell, method of preparing same and fuel cell system comprising same - Google Patents

Abstract

A membrane-electrode assembly for a fuel cell is provided to realize improved activity of an electrode catalyst and reduced interfacial resistance, thereby imparting a high output to a fuel cell. A membrane-electrode assembly(20) for a fuel cell comprises: an anode(22) and a cathode(21) disposed opposite to each other; and a polymer electrolyte membrane(25) interposed between the anode and the cathode, wherein the anode and the cathode comprise a heteropolyacid in a concentration-gradient manner. Each of the anode and the cathode comprises an electrode substrate and a catalyst layer, wherein the concentration of the heteropolyacid decreases from the electrode substrate to the catalyst layer.

Description

Membrane-electrode assembly for fuel cell, method for manufacturing same, and fuel cell system including same TECHNICAL FIELD

1 is a cross-sectional view schematically showing a membrane-electrode assembly for a fuel cell according to an embodiment of the present invention.

2 schematically illustrates the structure of a fuel cell system of the present invention;

[Industrial use]

The present invention relates to a fuel cell membrane-electrode assembly, a method for manufacturing the same, and a fuel cell system including the same, and more particularly, to a fuel cell membrane-electrode assembly having a high output, a method for manufacturing the same, and a fuel cell system including the same. will be.

[Prior art]

A fuel cell is a power generation system that directly converts the chemical reaction energy of hydrogen and oxygen contained in hydrocarbon-based materials such as methanol, ethanol and natural gas into electrical energy.

This fuel cell is a clean energy source that can replace fossil energy, and has the advantage of generating a wide range of outputs by stacking unit cells, and having an energy density of 4-10 times that of a small lithium battery. It is attracting attention as a compact and mobile portable power source.

Representative examples of the fuel cell include a polymer electrolyte fuel cell (PEMFC) and a direct oxidation fuel cell (Direct Oxidation Fuel Cell). When methanol is used as a fuel in the direct oxidation fuel cell, it is called a direct methanol fuel cell (DMFC).

The polymer electrolyte fuel cell has an advantage of having a high energy density and a high output, but requires attention to handling hydrogen gas and reforms fuel for reforming methane, methanol, natural gas, etc. to produce hydrogen as fuel gas. There is a problem that requires additional equipment such as a device.

On the other hand, the direct oxidation fuel cell has a lower energy density than the polymer electrolyte fuel cell, but it is easy to handle fuel and has a low operating temperature, so that it can be operated at room temperature, in particular, it does not require a fuel reformer.

In such fuel cell systems, the stack that substantially generates electricity comprises several unit cells consisting of a membrane-electrode assembly (MEA) and a separator (also called a bipolar plate). It has a structure laminated to several tens. The membrane-electrode assembly is called an anode electrode (also called "fuel electrode" or "oxidation electrode") and a cathode electrode (also called "air electrode" or "reduction electrode" with a polymer electrolyte membrane containing hydrogen ion conductive polymer therebetween. Has a structure in which

The principle of generating electricity in a fuel cell is that fuel is supplied to an anode electrode, which is a fuel electrode, adsorbed to a catalyst of the anode electrode, and the fuel is oxidized to generate hydrogen ions and electrons. Reaching the cathode electrode, hydrogen ions pass through the polymer electrolyte membrane and are delivered to the cathode electrode. An oxidant is supplied to the cathode, and the oxidant, hydrogen ions, and electrons react on the catalyst of the cathode to generate electricity while producing water.

It is an object of the present invention to provide a membrane-electrode assembly for fuel cells exhibiting high power.

Another object of the present invention is to provide a method of manufacturing the membrane-electrode assembly.

Another object of the present invention is to provide a fuel cell system comprising the membrane-electrode assembly.

In order to achieve the above object, the present invention also includes an anode electrode, a cathode electrode and a polymer electrolyte membrane positioned between the anode electrode and the cathode electrode located opposite each other, wherein the anode electrode and the cathode electrode is heteropoly It provides a membrane-electrode assembly for a fuel cell comprising an acid in a concentration gradient.

In this case, the anode electrode and the cathode electrode includes an electrode substrate and a catalyst layer, it is preferable that the heteropoly acid is present in a concentration gradient that decreases in concentration from the electrode substrate to the catalyst layer.

The present invention also provides an assembly including an anode electrode and a cathode electrode positioned opposite each other and a polymer electrolyte membrane positioned between the anode electrode and the cathode electrode, and flowing a heteropoly acid solution to the assembly, the membrane for a fuel cell Provided is a method of manufacturing an electrode assembly.

The invention also provides a fuel cell system comprising at least one electricity generator, a fuel supply and an oxidant supply. The electricity generating portion includes the membrane-electrode assembly of the present invention and includes a separator. In addition, the electricity generating unit serves to generate electricity through the oxidation reaction of the fuel and the reduction reaction of the oxidant. The fuel supply unit serves to supply fuel to the electricity generation unit, and the oxidant supply unit serves to supply an oxidant to the electricity generation unit.

Hereinafter, the present invention will be described in more detail.

Recently, research as a high activity electrode catalyst is actively progressing. One of them, heteropoly acid such as H ₃ PW ₁₂ O ₄₀ is a solid catalyst and has been recognized as a platinum-based alternative high activity catalyst because of its high electron and hydrogen ion conductivity, and many studies have been conducted. However, there are limitations in the practical use because it dissolves well in a polar aqueous solution such as water, methanol and ethanol, and a large amount of catalyst does not react and easily desorbs from the carrier.

In the present invention, the heteropoly acid was flowed to the membrane-electrode assembly, thereby remaining in the electrode to improve the output.

The membrane-electrode assembly of the present invention includes an anode electrode and a cathode electrode positioned opposite each other, and includes a polymer electrolyte membrane positioned between the anode electrode and the cathode electrode. The membrane-electrode assembly of the present invention is schematically shown in FIG. That is, the membrane-electrode assembly 20 of the present invention includes an anode electrode 22 and a cathode electrode 21 positioned opposite to each other, and a polymer located between the anode electrode 22 and the cathode electrode 21. An electrolyte membrane 25.

The anode electrode and the cathode electrode preferably comprises a heteropoly acid in a concentration gradient. In particular, in the anode electrode and the cathode electrode including the electrode substrate and the catalyst layer, it is preferable that the heteropolyacid is present in a concentration gradient whose concentration decreases from the electrode substrate to the catalyst layer. If the heteropoly acid is present up to the polymer electrolyte membrane, the effect of using the heteropoly acid is rather reduced, which is not preferable.

In the present invention, the concentration of heteropolyacid in the catalyst layer is more preferably 0.1 to 10% by weight, and most preferably 0.5 to 5% by weight of the concentration of heteropolyacid in the electrode substrate. When the concentration of heteropolyacid in the catalyst layer is less than 0.1% by weight of the concentration of heteropolyacid in the electrode substrate, there is little effect due to the presence of heteropolyacid in the catalyst layer, and when it exceeds 10% by weight, too much heteropoly acid is present in the catalyst layer. Large mass transfer resistance in the catalyst bed is undesirable.

As the heteropoly acid is present in the electrode in a concentration gradient, the resistance between the interfaces can be reduced while improving the activity of the catalyst, resulting in high output.

The heteropolyacid is [PMo ₁₂ O ₄₀ ] ^3- , [PW ₁₂ O ₄₀ ] ^3- , [GeMo12O40] 4-, [GeW ₁₂ O ₄₀ ] ^4- , [P ₂ W ₁₈ O ₆₂ ] ^6- , [SiW ₁₂ O ₄₀ ] ^4- , [PMo ₁₁ O ₃₉ ] ^7- , [P ₂ Mo ₅ O ₂₃ ] ^6- , [H ₂ W ₁₂ O ₄₀ ] ^6- and [PW ₁₁ O ₃₉ ] ^7- It is preferable to include at least one compound containing an anion. As the cation of the heteropolyacid, H ⁺ is preferable. Such heteropolyacids are highly electron and hydrogen ion conductive materials.

In the catalyst layer, any catalyst that can be used as a catalyst may be used as a catalyst in the reaction of the fuel cell, and a representative platinum-based catalyst may be used as a representative example. The platinum-based catalyst may be platinum, ruthenium, osmium, platinum-ruthenium alloy, platinum-osmium alloy, platinum-palladium alloy or platinum-M alloy (M is Ga, Ti, V, Cr, Mn, Fe, Co, Ni, At least one catalyst selected from the group consisting of Cu, Zn, Sn, Mo, W, Rh, Ru, and combinations thereof. Specific examples include Pt, Pt / Ru, Pt / W, Pt / Ni, Pt / Sn, Pt / Mo, Pt / Pd, Pt / Fe, Pt / Cr, Pt / Co, Pt / Ru / W, Pt / Ru One or more selected from the group consisting of / Mo, Pt / Ru / V, Pt / Fe / Co, Pt / Ru / Rh / Ni, and Pt / Ru / Sn / W can be used.

In addition, such a metal catalyst may be used as the metal catalyst (black) itself, or may be supported on a carrier. As the carrier, carbonaceous materials such as graphite, denka black, ketjen black, acetylene black, carbon nanotubes, carbon nanofibers, carbon nanowires, carbon nanoballs or activated carbon may be used, or alumina, silica, zirconia, Inorganic fine particles such as titania may be used, but carbon-based materials are generally used.

The catalyst layer may further include a binder resin for improving the adhesion of the catalyst layer and the transfer of hydrogen ions.

It is preferable to use a polymer resin having hydrogen ion conductivity as the binder resin, more preferably a cation exchange group selected from the group consisting of sulfonic acid group, carboxylic acid group, phosphoric acid group, phosphonic acid group and derivatives thereof in the side chain. Any polymer resin which has can be used. Preferably, a fluorine polymer, a benzimidazole polymer, a polyimide polymer, a polyetherimide polymer, a polyphenylene sulfide polymer, a polysulfone polymer, a polyether sulfone polymer, a polyether ketone polymer, a polyether One or more hydrogen ion conductive polymers selected from ether ketone polymers or polyphenylquinoxaline polymers, more preferably poly (perfluorosulfonic acid), poly (perfluorocarboxylic acid), Copolymers of tetrafluoroethylene with fluorovinyl ether containing sulfonic acid groups, defluorinated polyether ketones, aryl ketones, poly (2,2'-m-phenylene) -5,5'-bibenzimidazole One containing at least one hydrogen ion conductive polymer selected from (poly (2,2 '-(m-phenylene) -5,5'-bibenzimidazole) or poly (2,5-benzimidazole) may be used.

The hydrogen ion conductive polymer may replace H with Na, K, Li, Cs or tetrabutylammonium in an ion exchange group at the side chain end. In case of replacing H by Na in the ion-exchange group of the side chain terminal, NaOH is substituted in the preparation of the catalyst composition, and tetrabutylammonium hydroxide is used in the case of using tetrabutylammonium, and K, Li or Cs is also substituted with appropriate compounds. It can be substituted using. Since this substitution method is well known in the art, detailed description thereof will be omitted.

The binder resin may be used in the form of a single substance or a mixture, and may also be optionally used with a nonconductive polymer for the purpose of further improving adhesion to the polymer electrolyte membrane. It is preferable to adjust the usage-amount so that it may be suitable for a purpose of use.

Examples of the nonconductive polymer include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoro alkylvinyl ether copolymer (PFA), and ethylene / tetrafluoro Ethylene / tetrafluoroethylene (ETFE), ethylenechlorotrifluoro-ethylene copolymer (ECTFE), polyvinylidene fluoride, copolymer of polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), dode At least one selected from the group consisting of silbenzenesulfonic acid and sorbitol is more preferred.

The electrode substrate plays a role of supporting the electrode and diffuses the fuel and the oxidant to the catalyst layer, thereby serving to easily access the fuel and the oxidant to the catalyst layer. The electrode substrate is a conductive substrate, and representative examples thereof include carbon paper, carbon cloth, carbon felt, or metal cloth (porous film or polymer fiber composed of metal cloth in a fibrous state). The metal film is formed on the surface of the cloth formed with)) may be used, but is not limited thereto.

In addition, it is preferable to use a water-repellent treatment with a fluorine-based resin as the electrode base material because it can prevent the reactant diffusion efficiency from being lowered by water generated when the fuel cell is driven. Examples of the fluorine-based resin include polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoropropylene, polyperfluoroalkyl vinyl ether, polyperfluorosulfonyl fluoride alkoxy vinyl ether, and fluorinated ethylene propylene ( Fluorinated ethylene propylene), polychlorotrifluoroethylene or copolymers thereof can be used.

In addition, a microporous layer may be further included to enhance the reactant diffusion effect in the electrode substrate. These microporous layers are generally conductive powders having a small particle diameter, such as carbon powder, carbon black, acetylene black, activated carbon, carbon fiber, fullerene, carbon nanotubes, carbon nanowires, and carbon nanohorns. -horn or carbon nano ring.

The microporous layer is prepared by coating a composition comprising a conductive powder, a binder resin and a solvent on the electrode substrate. The binder resin may be polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoropropylene, polyperfluoroalkyl vinyl ether, polyperfluorosulfonyl fluoride, alkoxy vinyl ether, polyvinyl alcohol, cellulose acetate Or copolymers thereof and the like can be preferably used. As the solvent, alcohols such as ethanol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, water, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone, tetrahydrofuran, etc. may be preferably used. The coating process may be screen printing, spray coating, or coating using a doctor blade according to the viscosity of the composition, but is not limited thereto.

The polymer electrolyte membrane is generally used as a polymer electrolyte membrane in a fuel cell, and any one made of a polymer resin having hydrogen ion conductivity may be used. Representative examples thereof include a polymer resin having a cation exchange group selected from the group consisting of sulfonic acid group, carboxylic acid group, phosphoric acid group, phosphonic acid group and derivatives thereof in the side chain.

Representative examples of the polymer resin include a fluorine polymer, a benzimidazole polymer, a polyimide polymer, a polyetherimide polymer, a polyphenylene sulfide polymer, a polysulfone polymer, a polyether sulfone polymer and a polyether ketone It may include one or more selected from polymers, polyether-etherketone-based polymers or polyphenylquinoxaline-based polymers, more preferably poly (perfluorosulfonic acid) (generally marketed as Nafion), poly (Perfluorocarboxylic acid), copolymers of tetrafluoroethylene and fluorovinyl ether containing sulfonic acid groups, defluorinated sulfide polyether ketones, aryl ketones, poly (2,2'-m-phenylene)- 5,5'-bibenzimidazole (poly (2,2 '-(m-phenylene) -5,5'-bibenzimidazole) or poly (2,5-benzimidazole) can be mentioned at least one type. have.

In the hydrogen ion conductive group of the hydrogen ion conductive polymer, H may be substituted with Na, K, Li, Cs or tetrabutylammonium. In the hydrogen ion conductive group of the hydrogen ion conductive polymer, NaOH is substituted when H is replaced with Na, and tetrabutylammonium hydroxide is used when the substituent is substituted with tetrabutylammonium. It can be substituted using. Since this substitution method is well known in the art, detailed description thereof will be omitted.

The membrane-electrode assembly of the present invention is prepared by manufacturing an assembly in which an anode electrode and a cathode electrode are positioned to face each other, a polymer electrolyte membrane is positioned between the anode electrode and the cathode electrode, and a heteropolyacid solution is poured into the assembly. .

The heteropolyacid solution may be prepared by dissolving heteropolyacid in a solvent. As said solvent, 1 or more types of polar solvents, such as alcohol, such as water, methanol, ethanol, and isopropyl alcohol, can be mixed and used.

The concentration of the heteropolyacid solution is preferably 0.1 to 10% by weight. When the concentration of the heteropolyacid solution is less than 10% by weight, the heteropolyacid is dissolved in the polymer electrolyte membrane, thereby lowering the proton conductivity of the polymer electrolyte membrane, thereby lowering the output. When the concentration is less than 0.1% by weight, the effect is not preferable.

In the step of flowing the heteropolyacid solution, the heteropolyacid is preferably carried out at a rate of 1 to 1000 ml / min, and this step is preferably performed for 10 to 30 minutes. When the speed and time of the process of flowing the solution out of the above range, the conductivity is lowered, so the output may be lowered, which is not preferable.

As the heteropolyacid is flowed into the existing membrane-electrode assembly, the heteropolyacid may remain with strong adsorption to the electrode substrate and the catalyst, and also move to the catalyst layer through the electrode substrate in the process of flowing. The concentration is present at a concentration greater than that in the catalyst bed, ie in a concentration gradient.

The fuel cell system of the present invention includes at least one electricity generating portion, a fuel supply portion and an oxidant supply portion.

The electricity generating portion includes the membrane-electrode assembly and the separator (also referred to as bipolar plate) of the present invention. The electricity generation unit serves to generate electricity through the oxidation reaction of the fuel and the reduction reaction of the oxidant.

The fuel supply unit serves to supply fuel to the electricity generation unit, and the oxidant supply unit serves to supply an oxidant such as oxygen or air to the electricity generation unit.

In the present invention, the fuel may include hydrogen or hydrocarbon fuel in gas or liquid state. Representative examples of the hydrocarbon fuel include methanol, ethanol, propanol, butanol or natural gas.

A schematic structure of the fuel cell system of the present invention is shown in FIG. 1, which will be described in more detail with reference to the following. Although the structure shown in FIG. 1 shows a system for supplying fuel and oxidant to an electric generator using a pump, the fuel cell system of the present invention is not limited to such a structure, and a fuel cell using a diffusion method without using a pump is shown. Of course, it can also be used for system architecture.

The fuel cell system 1 of the present invention includes at least one electricity generation unit 3 for generating electrical energy through an oxidation reaction of a fuel and a reduction reaction of an oxidant, a fuel supply unit 5 for supplying the fuel, And an oxidant supply unit 7 for supplying an oxidant to the electricity generation unit 3.

In addition, the fuel supply unit 5 for supplying the fuel may include a fuel tank 9 storing fuel and a fuel pump 11 connected to the fuel tank 9. The fuel pump 11 serves to discharge the fuel stored in the fuel tank 9 by a predetermined pumping force.

The oxidant supply unit 7 for supplying the oxidant to the electricity generating unit 3 includes at least one oxidant pump 13 for sucking the oxidant with a predetermined pumping force.

The electricity generator 3 is composed of a membrane-electrode assembly 17 for oxidizing and reducing a fuel and an oxidant, and a separator 19 and 19 'for supplying fuel and an oxidant to both sides of the membrane-electrode assembly. At least one of these electricity generating units 3 constitutes a stack 15.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention and the present invention is not limited to the following examples.

(Example 1)

Pt-Ru Black (Johnson Matthey, HiSpec 6000) 88% by weight of anode catalyst and 5% by weight of Nafion / H ₂ O / 2-propanol (Solution Technology Inc.) binder was mixed to prepare a catalyst composition for the anode electrode It was.

A catalyst composition for the cathode electrode was prepared by mixing 88 wt% Pt black (Johnson Matthey, HiSpec 100) cathode catalyst and 12 wt% Nafion / H ₂ O / 2-propanol (Solution Technology Inc.) binder.

A catalyst layer was formed by applying the catalyst composition for the anode electrode and the catalyst composition for the cathode electrode to a carbon paper electrode substrate to prepare an anode electrode and a cathode electrode, respectively.

The assembly was prepared using the prepared anode and cathode electrodes and a commercial Nafion 115 (perfluorosulfonic acid) polymer electrolyte membrane.

The assembly was subjected to a process of flowing H ₃ PMO ₁₂ O ₄₀ solution at a rate of 1 ml / min for 20 minutes to prepare a membrane-electrode assembly for a fuel cell. In the prepared membrane-electrode assembly, H ₃ PMO ₁₂ O ₄₀ was present in the concentration gradient at the anode electrode and the cathode electrode. In addition, the average concentration of H ₃ PMO ₁₂ O ₄₀ in the catalyst layer was 0.1% by weight, and the average concentration in the electrode substrate was 1% by weight.

The H ₃ PMO ₁₂ O ₄₀ solution was prepared by dissolving H ₃ PMO ₁₂ O ₄₀ in a water solvent to a concentration of 1% by weight.

The fuel cell membrane-electrode assembly is inserted between two gaskets, and then inserted into two separators having a predetermined gas flow channel and a cooling channel and pressed between copper end plates to manufacture a unit cell. It was.

(Comparative Example 1)

88% by weight Pt-Ru Black (Johnson Matthey, HiSpec 6000) anode catalyst and 5% by weight Nafion / H ₂ O / 2-propanol (Solution Technology Inc.) 12% by weight were mixed, 95% by weight of this mixture and H A catalyst composition for the anode electrode was prepared by mixing 5 wt% of ₃ PMO ₁₂ O ₄₀ .

88% by weight Pt Black (Johnson Matthey, HiSpec 100) cathode catalyst and 12% by weight Nafion / H ₂ O / 2-propanol (Solution Technology Inc.) were mixed, 95% by weight of this mixture and H ₃ PMO 5 0 wt% of ₁₂ 0 ₄₀ were mixed to prepare a catalyst composition for the cathode electrode.

In the process of applying the catalyst composition for the anode electrode and the catalyst composition for the cathode electrode on a carbon paper electrode substrate, a catalyst layer was formed, respectively, to prepare an anode electrode and a cathode electrode, respectively.

Membrane-electrode assemblies for fuel cells were prepared using the prepared anode and cathode electrodes and a commercial Nafion 115 (perfluorosulfonic acid) polymer electrolyte membrane.

The fuel cell membrane-electrode assembly is inserted between two gaskets, and then inserted into two separators having a predetermined gas flow channel and a cooling channel and pressed between copper end plates to manufacture a unit cell. It was.

As a result of measuring the output characteristics of the batteries produced according to the above Example 1 and Comparative Example 1, the battery of Example 1 exhibited a very high output compared to Comparative Example 1.

All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

The membrane-electrode assembly for a fuel cell of the present invention can improve the activity of the electrode catalyst as the concentration of the heteropolyacid in the electrode, and the resistance between the interfaces can be reduced, resulting in high output.

Claims (9)

An anode electrode and a cathode electrode located opposite each other; And A polymer electrolyte membrane positioned between the anode electrode and the cathode electrode Including; The anode electrode and the cathode electrode is a fuel cell membrane-electrode assembly comprising a heteropoly acid in a concentration gradient. The method of claim 1, Wherein the anode electrode and the cathode electrode comprise an electrode substrate and a catalyst layer, wherein the heteropolyacid is present in a concentration gradient where the concentration decreases from the electrode substrate to the catalyst layer. The method of claim 2, A membrane-electrode assembly for a fuel cell, wherein the concentration of heteropolyacid in the catalyst layer is 0.1 to 10% of the concentration of heteropolyacid in the electrode substrate. The method of claim 1, The heteropolyacid is [PMo ₁₂ O ₄₀ ] ^3- , [PW ₁₂ O ₄₀ ] ^3- , [GeMo ₁₂ O ₄₀ ] ^4- , [GeW ₁₂ O ₄₀ ] ^4- , [P ₂ W ₁₈ O ₆₂ ] ^6- , [SiW ₁₂ O ₄₀ ] _4- , [PMo ₁₁ O ₃₉ ] ^7- , [P ₂ Mo ₅ O ₂₃ ] ^6- , [H ₂ W ₁₂ O ₄₀ ] ^6- and [PW ₁₁ O ₃₉ ] ^7- Membrane-electrode assembly for a fuel cell comprising at least one compound comprising an anion. Preparing an assembly comprising an anode electrode and a cathode electrode positioned opposite each other and a polymer electrolyte membrane positioned between the anode electrode and the cathode electrode; Flowing a heteropolyacid solution into the assembly; A method of manufacturing a membrane-electrode assembly for a fuel cell comprising a step. The method of claim 5, The concentration of the heteropolyacid solution is 0.1 to 10% by weight of the manufacturing method of the membrane-electrode assembly for fuel cell. The method of claim 5, The process of flowing the heteropolyacid solution is a method for producing a membrane-electrode assembly for a fuel cell is to perform the heteropoly acid at a rate of 1 to 1000ml / min flow rate. The method of claim 5, The process of flowing the heteropolyacid solution is a method for producing a fuel cell membrane electrode assembly for 10 to 30 minutes. An electricity generator including at least one membrane-electrode assembly and a separator including an anode electrode and a cathode electrode positioned to face each other and a polymer electrolyte membrane positioned between the anode electrode and the cathode electrode; A fuel supply unit supplying fuel to the electricity generation unit; And Oxidant supply unit for supplying an oxidant to the electricity generating unit A fuel cell system comprising: the anode electrode and the cathode electrode are the electrode of any one of claims 1 to 4.

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