KR100759450B1 - Cathode catalyst for fuel cell, membrane-electrode assembly for fuel cell comprising same and fuel cell system comprising same - Google Patents

Abstract

A cathode catalyst, and a membrane-electrode assembly and a fuel cell system including the same are provided to exhibit good selectivity together with excellent activity to reduction of an oxidant, and to improve performances of the fuel cell system. A cathode catalyst for a fuel cell comprises a carbon-based material and A-B-N supported on the carbon-based material. In the A-B-N, A is at least one element selected from the group consisting of Fe, Co and Mn, which is contained in an amount of 70-90 atom%, B is at least one element selected from the group consisting of S, Se and Te, which is contained in an amount of 2-5 atom% and N is contained in an amount of 5-18 atom%. The A-B-N is supported in an amount of 5-70 wt% based on the total weight of the catalyst. A membrane-electrode assembly includes a cathode(5) comprising the cathode catalyst(53), an anode(3) opposed to the cathode, and a polymer electrolytic membrane(1) disposed between the cathode and the anode.

Description

Cathode catalyst for fuel cell, membrane-electrode assembly and fuel cell system for fuel cell comprising same {CATHODE CATALYST FOR FUEL CELL, MEMBRANE-ELECTRODE ASSEMBLY FOR FUEL CELL COMPRISING SAME AND FUEL CELL SYSTEM COMPRISING SAME}

1 is a view schematically showing a cross section of 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 according to an embodiment of the invention.

[Industrial use]

The present invention relates to a cathode catalyst for a fuel cell, a membrane-electrode assembly for a fuel cell including the same, and a fuel cell system including the same, and more particularly, for a fuel cell including an excellent activity and selectivity for a reduction reaction of an oxidant. A cathode catalyst for a fuel cell capable of improving the performance of a membrane-electrode assembly and a fuel cell system, and a membrane-electrode assembly and a fuel cell system for a fuel cell comprising the same.

[Prior art]

A fuel cell is a power generation system that converts chemical reaction energy of hydrogen and oxidant contained in hydrogen or hydrocarbon-based material directly into electrical energy.

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).

In general, polymer electrolyte fuel cells have the advantages of high energy density and high output, but they require attention to the handling of hydrogen gas and fuels for reforming methane, methanol and natural gas to produce hydrogen, fuel gas. There is a problem that requires additional equipment such as a reforming device.

In contrast, the direct oxidation fuel cell has a slower reaction rate, which results in lower energy density, lower power, and a larger amount of electrode catalyst than the polymer electrolyte type, but it is easy to handle liquid fuel and has a low operating temperature. In particular, it has the advantage of not requiring a fuel reformer.

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

It is an object of the present invention to provide a cathode catalyst for a fuel cell having excellent activity and selectivity for the reduction reaction of an oxidant.

Yet another object of the present invention is to provide a membrane-electrode assembly for a fuel cell comprising the cathode catalyst.

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

In order to achieve the above object, the present invention is a carbon-based material and ABN supported on the carbon-based material (wherein A is at least one element selected from the group consisting of Fe, Co and Mn, B is S, Se And at least one element selected from the group consisting of Te) provides a cathode catalyst for a fuel cell.

The present invention also includes an anode electrode and a cathode electrode positioned opposite to each other and a polymer electrolyte membrane positioned between the anode and the cathode electrode, wherein the cathode electrode comprises the cathode catalyst of the present invention- Provide an electrode assembly.

The present invention also provides an electricity generator including the membrane electrode assembly of the present invention and separators located on both sides of the membrane electrode assembly, a fuel supply unit supplying fuel to the electricity generator, and an oxidant to the electricity generator. It provides a fuel cell system comprising an oxidant supply.

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

A fuel cell is a power generation system that obtains electrical energy through oxidation of a fuel and reduction of an oxidant. An oxidation reaction of a fuel occurs at an anode electrode and a reduction reaction of an oxidant occurs at a cathode electrode.

Catalysts capable of promoting the oxidation reaction of the fuel and the reduction reaction of the oxidant are used for the catalyst layers of the anode electrode and the cathode electrode, and platinum-ruthenium is typically used for the catalyst layer of the anode electrode and platinum is used for the catalyst layer of the cathode electrode.

However, the platinum used as the cathode catalyst lacks the selectivity for the reduction reaction of the oxidant, and is depolarized by the fuel that has passed through the electrolyte membrane to the cathode region in a direct oxidation fuel cell. There is a problem of deactivation, and attention is focused on a catalyst that can replace platinum.

Cathode catalyst of the present invention is to solve the above problems, the carbon-based material and the ABN supported on the carbon-based material (wherein A is at least one element selected from the group consisting of Fe, Co and Mn, B Is at least one element selected from the group consisting of S, Se, and Te). In the catalyst, ABN, wherein A is at least one element selected from the group consisting of Fe, Co, and Mn, and B is at least one element selected from the group consisting of S, Se, and Te) It is an active substance having activity against a reduction reaction, and the carbonaceous substance corresponds to a carrier supporting the active substance.

In A-B-N, the active substance, A (Fe, Co or Mn) has a high activity for the reduction reaction of the oxidizing agent. However, A has a problem in that oxygen in the air is easily adsorbed, the adsorbed oxygen blocks the active center of the A in which the reduction reaction of the oxidant occurs, making the reduction reaction of the oxidant difficult.

Nitrogen (N) increases the activity of iron oxidant reduction by binding to iron and supplying electrons to iron.

B (S, Se or Te) binds with iron, preventing oxygen in the air from adsorbing to iron, thereby allowing the iron to be selectively active in the reduction reaction of the oxidant as described above.

Therefore, the active material of the present invention has excellent activity and selectivity for the reduction reaction of the oxidizing agent and can be effectively used as a cathode catalyst for fuel cells. In particular, due to the excellent selectivity to the reduction reaction of the oxidant, it can be used more effectively in a direct oxidation fuel cell in which crossover of fuel is a problem.

In the ABN, the content of A is 70 to 90 atomic%, the B content is 2 to 5 atomic%, the content of N is preferably 5 to 18 atomic%, and the content of A is 75 to 85 atoms %, The content of B is 3 to 4 atomic%, the content of N is more preferably 10 15 atomic%. This is because the activity and selectivity for the reduction reaction of the oxidizing agent of A-B-N in the above range is the best.

The A-B-N is used by being supported on a carbon-based material. When using ABN itself, where A is at least one element selected from the group consisting of Fe, Co and Mn, and B is at least one element selected from the group consisting of S, Se and Te) This is because the electrical conductivity is insufficient, the particles are agglomerated with each other to obtain a small particle size. By supporting the carbon-based material, the electrical conductivity of the catalyst can be improved, and the size of the catalyst particles can be reduced to increase the surface area per unit mass, that is, the specific surface area. By increasing the specific surface area, the activity per unit mass of the catalyst can be increased.

Any carbon-based material may be used as the carrier, but graphite, denka black, ketjen black, carbon nanotubes, carbon nanofibers, carbon nanowires, and the like may be preferably used.

The amount of A-B-N supported on the carbon-based material is preferably 5 to 70% by weight based on the total weight of the catalyst. If the supported amount is less than 5% by weight, there is a problem that the activity per unit mass of the catalyst is excessively lowered. If the amount is more than 70% by weight, the catalyst particles are agglomerated and the catalyst activity is significantly lowered, which is not preferable.

In the cathode catalyst of the present invention, the iron complex compound of the macrocycle ligand supported on the carbonaceous material is heat-treated, the powder and sulfur powder obtained through the heat-treatment process are added to the solvent, mixed, and the prepared solution is dried to remove the solvent. It may be prepared by a catalyst preparation method comprising a step of post-heat treatment. The same process can also be carried out using cobalt or manganese complex compounds in addition to iron.

First, the iron complex compound of the macrocycle ligand supported on the carbonaceous material is heat-treated. Since the process of supporting the complex compound on the carbon-based material may be made by a generally known supporting method such as an impregnation method, detailed description thereof will be omitted. Iron complex compounds of the macrocycle ligands include Fe-tetraphenylporphyrin (Fe-TPP), Fe-tetramethoxyphenylporphyrin (Fe-TMPP) and iron-phthalocyanine (Fe-phthalocyanine, Fe -PC) can be preferably used. The heat treatment is preferably carried out at 600 to 900 ℃.

Next, at least one powder and sulfur powder, selenium powder or telelium powder obtained through the above process are added to the solvent and mixed. Benzene, toluene or xylene may be preferably used as the solvent. At this time, the mixing ratio can be appropriately adjusted according to the desired composition.

Finally, the solution prepared through the above process is dried to remove the solvent and then heat treated. It is preferable to perform heat processing at the temperature of 300-400 degreeC in nitrogen atmosphere.

The present invention also provides a fuel cell membrane-electrode assembly comprising the cathode catalyst for fuel cell of the present invention as described above.

The membrane-electrode assembly of the present invention includes an anode electrode and a cathode electrode positioned to face each other and a polymer electrolyte membrane positioned between the anode and the cathode electrode, wherein the anode electrode and the cathode electrode are formed of an electrode substrate and a conductive substrate. It includes a catalyst layer formed on the electrode substrate.

1 is a view schematically showing a cross section of the membrane-electrode assembly 131 according to an embodiment of the present invention. Hereinafter, the membrane-electrode assembly 131 of the present invention will be described with reference to the drawings.

The membrane-electrode assembly 131 generates electricity through oxidation of a fuel and reduction of an oxidant, and one or several are stacked and mounted in a stack.

A reduction reaction of the oxidant occurs in the catalyst layer 53 of the cathode electrode, and the catalyst layer includes the cathode catalyst for fuel cell of the present invention. The cathode catalyst shows excellent activity and selectivity for the reduction reaction of the oxidant, thereby improving the performance of the cathode electrode 5 and the membrane-electrode assembly 131 including the same.

In the catalyst layer 33 of the anode electrode, an oxidation reaction of fuel occurs, and a catalyst capable of promoting this may be included. A platinum-based catalyst, which is conventionally used, may be used. 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 and Zn, and at least one transition metal selected from the group consisting of Cu and Zn.

The catalyst may be used as the catalyst itself (black), or may be supported on a carrier. As the carrier, carbon such as acetylene black, denka black, activated carbon, ketjen black, graphite may be used, or inorganic fine particles such as alumina, silica, titania, zirconia may be used, but carbon may be most preferably used. .

The catalyst layers 33 and 53 of the anode electrode and the cathode electrode may include a binder to improve adhesion of the catalyst layer and transfer of hydrogen ions.

It is preferable to use a polymer resin having hydrogen ion conductivity as the binder, and more preferably have 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 present 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 and fluorovinyl ethers containing sulfonic acid groups, defluorinated sulfided polyether ketones, aryl ketones, poly [2,2 '-(m-phenylene) -5,5'-bibenziimi Dozol] (poly [2,2 '-(m-phenylene) -5,5'-bibenzimidazole]) or poly (2,5-benzimidazole) comprising at least one hydrogen ion conductive polymer selected from Can .

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 substrates 31 and 51 of the anode electrode and the cathode electrode serve to make a reaction source, that is, a fuel and an oxidant, easily accessible to the catalyst layers 31 and 51, and the electrode substrates 31 and 51 are conductive. A substrate is used, and representative examples thereof include carbon paper, carbon cloth, carbon felt, or metal cloth (porous film made of metal in a fibrous state or on the surface of a cloth formed of polymer fiber). One or more metal film formed (metalized polymer fiber) 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. As the fluorine-based resin, polyvinylidene fluoride, polytetrafluoroethylene, fluorinated ethylene propylene, polychlorotrifluoroethylene, fluoroethylene polymer, or the like may 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. As the binder resin, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl alcohol, cellulose acetate, and the like may be preferably used. The solvent may be ethanol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, or the like. Alcohol, water, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone and the like can 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.

As the polymer electrolyte membrane 1, a polymer having an ion exchange function of transferring hydrogen ions generated in the catalyst layer 33 of the anode electrode to the catalyst layer 53 of the cathode electrode, and having excellent hydrogen ion conductivity may be used.

Representative examples thereof include a polymer resin having at least one cation exchange group selected from the group consisting of sulfonic acid groups, carboxylic acid groups, phosphoric acid groups, phosphonic acid groups 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 at least one selected from a polymer, a polyether-etherketone-based polymer or a polyphenylquinoxaline-based polymer, more preferably poly (perfluorosulfonic acid), poly (perfluorocarboxylic acid), Copolymers of tetrafluoroethylene and fluorovinyl ethers containing sulfonic acid groups, defluorinated sulfided polyether ketones, aryl ketones, poly [2,2 '-(m-phenylene) -5,5'-bibenziimi 1 or more types chosen from polyazole (poly [2,2 '-(m-phenylene) -5,5'-bibenzimidazole]) or poly (2,5-benzimidazole).

In the hydrogen ion conductive group of the hydrogen ion conductive polymer, H may be substituted with Na, K, Li, Cs or tetrabutylammonium. 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 process of manufacturing the electrode of the present invention having such a configuration can be carried out by the process of forming a catalyst layer on the electrode substrate using a conventional method such as spray coating, doctor blade, and the like, the catalyst composition comprising a catalyst, a binder and a solvent. Since the electrode manufacturing process is well known in the art, detailed description thereof will be omitted.

The present invention also provides a fuel cell system comprising the membrane-electrode assembly of the present invention as described above. 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 unit includes the membrane-electrode assembly of the present invention and a separator (bipolar plate) located on both sides of the membrane-electrode assembly. 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 to the electricity generation unit. The fuel means hydrogen or hydrocarbon fuel in gas or liquid state, and typical hydrocarbon fuels include methanol, ethanol, propanol or butanol, and the like. Oxygen is typically used as the oxidant, and may be used by injecting pure oxygen or air. However, the fuel and the oxidant are not limited thereto.

The fuel cell system of the present invention may be employed without limitation in Polymer Electrolyte Membrane Fuel Cell (PEMFC) and Direct Oxidation Fuel Cell (PEMFC). However, since the selectivity to the oxygen reduction reaction of the catalyst used in the catalyst layer of the cathode electrode is excellent, it can be used more effectively in a direct oxidized fuel cell in which crossover of fuel is problematic, and a direct methanol fuel cell (DMFC: Direct Methanol) Fuel Cell) can be used most effectively.

A schematic structure of a fuel cell system 100 according to an embodiment of the present invention is shown in FIG. 2, which will be described in more detail with reference to the following. 2 shows a system for supplying fuel and oxidant to the electricity generation unit 130 using pumps 151 and 171, but the fuel cell membrane-electrode assembly 131 of the present invention is limited to such a structure. Of course, it can be used in a fuel cell system having a structure using a diffusion method without using a pump.

The fuel cell system 100 includes a stack 110 having at least one electricity generator 130 for generating electrical energy through an oxidation reaction of a fuel and a reduction reaction of an oxidant, and a fuel supply unit 150 for supplying the fuel. ) And an oxidant supply unit 170 for supplying an oxidant to the electricity generation unit 130.

The fuel supply unit 150 supplying the fuel includes a fuel tank 153 for storing fuel and a fuel pump 151 connected to the fuel tank 153. The fuel pump 151 serves to discharge the fuel stored in the fuel tank 153 by a predetermined pumping force.

The oxidant supply unit 170 for supplying an oxidant to the electricity generating unit 130 of the stack 110 includes at least one oxidant pump 171 that sucks the oxidant with a predetermined pumping force.

The electricity generating unit 130 is a membrane-electrode assembly 131 for oxidizing and reducing a fuel and an oxidant and a separator (bipolar plate) for supplying fuel and an oxidant to both sides of the membrane-electrode assembly 131 ( 133,135).

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)

5 g of iron phthalocyanine, 2 g of Ketjen Black and 200 ml of benzene were stirred at a temperature of 80 ° C. for 24 hours. The solvent was volatilized from the obtained solution to obtain a powder, and the powder was heat-treated at a temperature of 750 ° C. for 5 hours while flowing H ₂ . 1 g of the powder and 0.06 g of S were stirred in 150 ml of benzene for 24 hours at a temperature of 80 ° C. Subsequently, the solvent was volatilized in the obtained product, and then heat-treated at 350 ° C. for 3 hours while flowing H ₂ to prepare a cathode catalyst for fuel cell including Fe-SN supported on a carbon carrier. In this case, the Fe content in the Fe-SN was 86 atomic%, the S content was 2 atomic% and the N content was 12 atomic%, and the amount of Fe-SN supported on the carbon carrier was 64 weight based on the total weight of the catalyst. %, And the average particle size was 4 nm.

(Comparative Example 1)

4.3 g of iron phthalocyanine, 2.2 g of Ketjen Black and 180 ml of benzene were stirred at a temperature of 80 ° C. for 24 hours. After the solvent was volatilized from the obtained solution, heat treatment was performed for 5 hours while flowing H ₂ at a temperature of 750 ° C. to prepare a cathode catalyst for a fuel cell.

Using a cathode catalyst prepared according to Example 1 and Comparative Example 1, after producing a fuel cell system in a conventional manner, the current density at 0.7V was measured, and the results are shown in Table 1 below.

Current density, mA / cm ² (0.7 V) Example 1 1.22 Comparative Example 1 0.41

As shown in Table 1, it can be seen that the current density of the cathode catalyst of Example 1 is very high compared to Comparative Example 1.

The cathode catalyst for a fuel cell of the present invention is excellent in activity and selectivity for a reduction reaction of an oxidant, and has an advantage of improving performance of a fuel cell membrane-electrode assembly and a fuel cell system including the same.

Claims (15)

Carbon-based materials; And A-B-N supported on the carbonaceous material (wherein A is at least one element selected from the group consisting of Fe, Co, and Mn, and B is at least one element selected from the group consisting of S, Se, and Te) Cathode catalyst for a fuel cell comprising a. The method of claim 1, In the ABN (wherein A is at least one element selected from the group consisting of Fe, Co and Mn, B is at least one element selected from the group consisting of S, Se and Te), the content of A is 70 to 90 atomic%, the content of B is 2 to 5 atomic%, the content of N is 5 to 18 atomic% cathode catalyst for fuel cells. The method of claim 2, The content of A in the ABN (where A is at least one element selected from the group consisting of Fe, Co and Mn, and B is at least one element selected from the group consisting of S, Se and Te) is 75 To 85 atomic%, the content of B is 3 to 4 atomic%, the content of N is 10 to 15 atomic% cathode catalyst for fuel cells. The method of claim 1, The supported amount of the ABN (where A is at least one element selected from the group consisting of Fe, Co, and Mn, and B is at least one element selected from the group consisting of S, Se, and Te) is the total weight of the catalyst 5 to 70% by weight relative to the cathode catalyst for fuel cells. The method of claim 1, The carbon-based material is selected from the group consisting of graphite, denka black, ketjen black, carbon nanotubes, carbon nanofibers, carbon nanowires and mixtures thereof. An anode electrode and a cathode electrode positioned opposite each other; and A polymer electrolyte membrane positioned between the anode and the cathode electrode, 6. The membrane electrode assembly of a fuel cell, wherein the cathode electrode comprises the cathode catalyst according to any one of claims 1 to 5. The method of claim 6, The polymer electrolyte membrane comprises a polymer resin having a cation exchange group selected from the group consisting of sulfonic acid group, carboxylic acid group, phosphoric acid group, and phosphonic acid group in the side chain. The method of claim 7, wherein The polymer resin may be 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 poly Membrane-electrode assembly for fuel cell, which is at least one polymer resin selected from the group consisting of ether-etherketone-based polymers and polyphenylquinoxaline-based polymers. The method of claim 8, The polymer resin is tetrafluoroethylene including poly (perfluorosulfonic acid), poly (perfluorocarboxylic acid), sulfonic acid group. Copolymers of fluorovinyl ethers containing sulfonic acid groups, defluorinated sulfided polyether ketones, aryl ketones, poly [2,2 '-(m-phenylene) -5,5'-bibenzimidazole] (poly [ 2,2 '-(m-phenylene) -5,5'-bibenzimidazole]) and poly (2,5-benzimidazole). The membrane-electrode assembly for a fuel cell, which is at least one polymer resin selected from the group consisting of: The method of claim 6, The anode electrode is platinum, ruthenium, osmium, platinum-ruthenium alloy, platinum-osmium alloy, platinum-palladium alloy and platinum-M alloy (M is Ga, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Membrane-electrode assembly for a fuel cell comprising at least one catalyst selected from the group consisting of one or more transition metals selected from the group consisting of Zn. The method of claim 10, Wherein the catalyst is supported on a carrier selected from the group consisting of acetylene black, denka black, activated carbon, ketjen black, graphite, alumina, silica, titania, zirconia and mixtures thereof. An anode electrode and a cathode electrode positioned to face each other and a polymer electrolyte membrane positioned between the anode and the cathode electrode, wherein the cathode electrode comprises a cathode catalyst according to any one of claims 1 to 5 An electricity generator including a membrane electrode assembly and separators disposed on both sides of the membrane electrode assembly; A fuel supply unit supplying fuel to the electricity generation unit; And Oxidant supply unit for supplying an oxidant to the electricity generating unit Fuel cell system comprising a The method of claim 12, The fuel cell system is selected from the group consisting of a polymer electrolyte fuel cell and a direct oxidation fuel cell. The method of claim 13, And the fuel cell system is a direct oxidation fuel cell. The method of claim 4, wherein The supported amount of the ABN (where A is at least one element selected from the group consisting of Fe, Co, and Mn, and B is at least one element selected from the group consisting of S, Se, and Te) is the total weight of the catalyst It is 64 to 70% by weight relative to the cathode catalyst for fuel cells.

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