JP2022095263A - Catalyst ink for polymer electrolyte fuel cell, catalyst layer for polymer electrolyte fuel cell, and membrane-electrode assembly for polymer electrolyte fuel cell - Google Patents

Abstract

To provide a catalyst layer ink for a polymer electrolyte fuel cell, which has improved proton conduction and exhibits high power generation performance.SOLUTION: A catalyst layer ink for a polymer electrolyte fuel cell satisfies a formula (1) in which the ratio (P2/P1) of a frequency peak (P2) having a particle size in the range of 0.3 μm or more and less than 1.0 μm to a frequency peak (P1) having a particle size in the range of 1.0 μm or more and 12 μm or less of the dispersoid of the catalyst ink, which is composed of catalyst particles, conductive carrier, polymer electrolyte, fibrous substance, and three or more kinds of solvents and measured by a particle size distribution measuring device, is 1.2 or more and less than 2.0. 2.0>P2/P1≥1.2 (1).SELECTED DRAWING: Figure 1

Description

The present invention relates to a catalyst ink for a polymer electrolyte fuel cell, a catalyst layer for a polymer electrolyte fuel cell, and a membrane-electrode assembly for a polymer electrolyte fuel cell.

In recent years, in order to solve environmental problems such as global warming, the development of new power sources for CO ₂ reduction is required. As a power source for this, fuel cells that do not emit CO ₂ are attracting attention. A fuel cell uses a fuel (eg hydrogen) and an oxidant (eg oxygen) to oxidize to produce harmless water. The chemical energy obtained by producing water is converted into electrical energy and used as a power source or power source.

Since the fuel cell is classified according to the type of electrolyte, it strongly depends on the operating temperature, and a suitable fuel cell is used depending on the operating temperature range of the load. The polymer electrolyte fuel cell (PEFC) is being developed as a household power source and an in-vehicle power source because it can be operated at a low temperature, has a high output density, and can be miniaturized and lightweight.

A solid polymer fuel cell (PEFC) has a structure (film electrode junction) in which a polymer electrolyte membrane is sandwiched between a fuel electrode (anode) and an air electrode (cathode), and hydrogen is used as a fuel gas on the fuel electrode side. By supplying and supplying air gas containing oxygen to the air electrode side, power is generated by the following electrochemical reaction.
Anode: H ₂ → 2H ⁺ + 2e -... ⁽ Reaction 1)
Cathode: 1 / 2O ₂ + 2H ⁺ + ^2e- → H ₂ O ・ ・ ・ (Reaction 2)
The anode and cathode are each composed of a laminated structure of a catalyst layer and a gas diffusion layer. Protons and electrons are generated from the hydrogen supplied to the anode-side catalyst layer by the electrode catalyst (reaction 1). Protons pass through the polyelectrolyte and the polyelectrolyte film in the anode-side catalyst layer and move to the cathode. The electrons pass through an external circuit and move to the cathode. In the cathode-side catalyst layer, protons, electrons, and oxygen contained in the air supplied from the outside react to generate water (reaction 2).

To reduce the cost of fuel cells, we are focusing on the development of fuel cells that exhibit high output characteristics. However, there is a problem that the proton conduction of the polymer electrolyte is lowered due to the shortage of water due to the low humidification operation, and the power generation performance is lowered. The catalyst of the fuel cell is a conductive carrier, for example, a metal having catalytic activity such as platinum supported on the surface of carbon particles. The surface of carbon particles is originally hydrophobic, and the surface state of the surface of a metal having catalytic activity is not controlled due to the influence of impurities and the like. When such catalyst particles and a hydrophilic polymer solution are mixed, the surface tension of the catalyst particles causes the particles to remain in a state immediately after mixing, making it difficult to uniformly disperse the catalyst particles. Therefore, there is known a technique in which the peak of the particle size distribution of the catalyst-supported particles is 1 μm (Patent Document 1). Generally, when the surface of catalyst-supported particles is activated, the surface area becomes large, so that they are easily adsorbed to each other to form lumps. Even if catalyst-supported particles having a particle size of 1 μm or less are used, a peak may appear in a region where the particle size is 1 μm or more when the particle size of the catalyst-supported particles after the activation treatment is measured. This peak is thought to be due to the mass. Then, when the electrolyte membrane is manufactured using the catalyst-supported particles in which such lumps are generated, the lumps may be pushed into the electrolyte membrane and may have an adverse effect on the electrolyte membrane, such as breaking the electrolyte membrane. In order to solve the above problems, the polyelectrolyte, which has the function of proton conduction in the catalyst ink, and the catalyst are uniformly entangled to improve the proton conductivity and the output characteristics of the polymer electrolyte fuel cell. ..

Japanese Unexamined Patent Publication No. 2005-285511

The present invention has been made in view of the above circumstances, and is a catalyst ink for a polymer electrolyte fuel cell capable of improving proton conduction and high output, a catalyst layer and a film for a polymer electrolyte fuel cell. It is an object of the present invention to provide an electrode assembly.

A catalyst ink for a solid polymer fuel cell, which is composed of catalyst particles, a conductive carrier, a polymer electrolyte, a fibrous substance and a solvent, according to one aspect of the present invention, in order to solve the above problems. The frequency peak (P1) in which the particle size in the dispersoid of the catalyst ink measured by the particle size distribution measuring device exists in the range of 1.0 μm or more and 12 μm or _less , and the particle size is 0.3 μm or more and less than 1.0 μm. It is characterized by satisfying the equation (1) in which the ratio (P ₂ / P ₁ ) to the frequency peak (P ₂ ) existing in the range is 1.2 or more and less than 2.0.

2.0 ＞ P ₂ / P ₁ ≧ 1.2 ・ ・ ・ ・ Equation (1)
Further, the catalyst ink for a polymer electrolyte fuel cell according to one aspect of the present invention is characterized in that the catalyst particles are metals selected from platinum, palladium, ruthenium, iridium, rhodium, and osmium. It is a catalyst layer for a polymer electrolyte fuel cell according to one aspect of the present invention, and is characterized by being made of the catalyst ink for a polymer electrolyte fuel cell.

Further, the membrane-electrode assembly for a polymer electrolyte fuel cell according to one aspect of the present invention is characterized in that the catalyst layer for a polymer electrolyte fuel cell is provided on at least one of an anode and a cathode.

According to one aspect of the present invention, it becomes possible to provide a catalyst layer for a polymer electrolyte fuel cell, which has improved proton conduction and exhibits high power generation performance.

It is a block diagram of the catalyst ink for the polymer electrolyte fuel cell which concerns on embodiment of this invention. It is a block diagram of the catalyst layer for the polymer electrolyte fuel cell which concerns on embodiment of this invention. It is a block diagram of the membrane electrode assembly which concerns on embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments described below, and modifications such as design changes can be made based on the knowledge of those skilled in the art, and such modifications have been added. The embodiments are also included in the scope of the embodiments of the present invention.

FIG. 1 is a catalyst ink for a polymer electrolyte fuel cell according to an embodiment of the present invention, which comprises catalyst particles 1, a conductive carrier 2, a polyelectrolyte 3, and a fibrous substance 4. FIG. 2 shows a catalyst layer (catalyst layer 5 for cathode) for a polymer electrolyte fuel cell according to an embodiment of the present invention, which comprises catalyst particles 1, a conductive carrier 2, a polymer electrolyte 3, and a fibrous substance 4. It is a catalyst layer 6) for an anode. FIG. 3 is a membrane electrode assembly according to an embodiment of the present invention, which includes a polyelectrolyte film 7, a cathode catalyst layer 5, an anode catalyst layer 6, a gasket material 8, and a gas diffusion layer 9.

Next, the configuration of the catalyst layer (cathode catalyst layer 5, anode catalyst layer 6) will be described with reference to FIG. The catalyst particles 1 used in this embodiment include platinum group elements such as platinum, palladium, ruthenium, iridium, rhodium, and osmium, as well as iron, lead, copper, chromium, cobalt, nickel, manganese, vanadium, molybdenum, gallium, and aluminum. Metals such as, or alloys of these can be used. Further, oxides, double oxides and the like can also be used. Further, the particle size of these catalysts is, for example, 0.1 nm or more and 1 μm or less, preferably 0.5 nm or more and 100 nm or less, and more preferably 1 nm or more and 10 nm or less.

Carbon particles are generally used as the conductive carrier 2 that supports these catalyst particles 1. The type of carbon particles may be any kind as long as it is in the form of fine particles and has conductivity and is not attacked by the catalyst particles 1, but carbon black, graphite, graphite, activated carbon, fullerene and the like can be used.

The polyelectrolyte 3 used in the present embodiment may be any as long as it has proton conductivity, and the same material as that of the polyelectrolyte film 7 (see FIG. 3) can be used. A hydrogen-based polymer electrolyte or the like can be used. As the fluorine-based polymer electrolyte, for example, Nafion (registered trademark) -based material manufactured by DuPont can be used.

The ratio I / (C + CF) of the mass C of the conductive carrier 2 supported on the catalyst particles 1 and the mass CF of the fibrous substance 4 to the mass I of the polyelectrolyte 3 is 0.2 or more and 1.5 or less. It would be nice to have it.
In particular, when the IEC (ion exchange capacity of the polymer electrolyte) is 1.1 or more and less than 1.3, the I / (C + CF) is more preferably 0.2 or more and less than 0.8. Further, when the IEC is 1.3 or more and less than 1.5, the I / (C + CF) is more preferably 0.8 or more and 1.5 or less. This is because the lower the IEC, the easier it is for the polyelectrolyte 3 and the fibrous substance 4 to become entangled, and the IEC changes the effective range of I / (C + CF) for the power generation performance.
When I / (C + CF) is less than 0.2, the proton path is poor and the power generation performance is significantly impaired. Further, when I / (C + CF) exceeds 1.5, the drainage property of the catalyst layer deteriorates, and the power generation performance of the fuel cell is significantly impaired.

As the fibrous substance 4 used in the present embodiment, carbon fibers such as carbon fibers, carbon nanofibers, and carbon nanotubes, and polymer electrolyte fibers having proton conductivity can be used. Preferred examples include carbon nanofibers and carbon nanotubes. For example, a material such as VGCF-H (registered trademark) manufactured by Showa Denko KK can be used. The fiber diameter of the carbon fiber is preferably 30 to 500 nm, more preferably 60 to 300 nm. By setting the above range, the voids in the catalyst layer can be increased, and high power generation performance is exhibited. The fiber length of the carbon fiber is preferably 0.5 to 20 μm, more preferably 1 to 10 μm. Within the above range, the strength of the catalyst layer can be increased and cracks can be suppressed during formation. In addition, the voids in the catalyst layer can be increased, and high power generation performance is exhibited. Further, the solvent used as the dispersion medium of the catalyst ink does not erode the conductive carrier 2, the polyelectrolyte 3 and the fibrous substance 4 carrying the catalyst particles 1, and the polyelectrolyte 3 has high fluidity. There is no particular limitation as long as it can be dissolved or dispersed as a fine gel in the state.

The solvent preferably contains a volatile organic solvent or water, and the organic solvent is not particularly limited, but is methanol, ethanol, 1-propanol, 2-propanol, 1 -Alcoholic solvents such as butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, pentanol, acetone, methyl ethyl ketone, pentanone, methyl isobutyl ketone, heptanone, cyclohexanone, methylcyclohexanone, acetonylacetone, Ketone-based solvents such as diisobutylketone, ether-based solvents such as tetrahydrofuran, dioxane, diethylene glycol dimethyl ether, anisole, methoxytoluene, and dibutyl ether, and other dimethylformamides, dimethylacetamides, N-methylpyrrolidones, ethylene glycols, diethylene glycols, diacetone alcohols, 1 -A polar solvent such as methoxy-2-propanol is used. Further, a mixture of three or more kinds of solvents is preferable, and a one containing two or more kinds of alcohols is preferable. Further, when a plurality of solvents having different polarities and dielectric constants are mixed in the catalyst ink, the polyelectrolyte 3 reaches every corner of the catalyst, and the power generation performance is improved.

Next, the production and configuration of the membrane electrode assembly will be described with reference to FIG.
The membrane electrode assembly includes a catalyst layer (cathode catalyst layer 5 on the front surface side, anode catalyst layer 6 on the back surface side), a gasket material 8, and a gas diffusion layer 9 on the front and back surfaces of the polymer electrolyte membrane 7. The gasket material 8 and the gas diffusion layer 9 are laminated in this order from the polymer electrolyte membrane 7 side. The gasket material 8 is arranged so as to surround the catalyst layer (cathode catalyst layer 5, anode catalyst layer 6).

As the polyelectrolyte film 7 used in the film electrode joint, any polyelectrolyte having proton conductivity may be used, and a fluorine-based polyelectrolyte, a hydrocarbon-based polyelectrolyte, or the like can be used. As the fluoropolymer electrolyte, for example, Nafion (registered trademark) manufactured by DuPont can be used. Further, as the hydrocarbon-based polymer electrolyte membrane, for example, an electrolyte membrane such as a sulfonated polyether ketone, a sulfonated polyether sulfone, a sulfonated polyether ether sulfone, a sulfonated polysulfide, or a sulfonated polyphenylene can be used. Above all, a material containing perfluorosulfonic acid as the fluoropolymer electrolyte can be preferably used as the polymer electrolyte membrane 7.

The plastic film having the gasket material 8 and the adhesive layer may be any as long as it has heat resistance to the extent that it does not melt at the time of heat pressurization. For example, polymers such as polyethylene naphthalate, polyethylene terephthalate, polyimide, polypalvanic acid aramid, polyamide (nylon), polysulfone, polyether sulfone, polyether sulfone, polyphenylene sulfide, polyether ether ketone, polyetherimide, and polyacrylate. Films can be used. Further, a heat-resistant fluororesin such as an ethylene tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroperfluoroalkyl vinyl ether copolymer, or polytetrafluoroethylene can also be used. The base material in the gasket material 8 is particularly preferably polyethylene naphthalate in consideration of gas barrier properties and heat resistance.

The adhesive layer of the plastic film having the gasket material 8 and the adhesive layer may be any adhesive such as acrylic, urethane, silicone, and rubber, and has adhesion to the gasket material 8 and the polymer electrolyte film 5. Considering the heat resistance at the time of heat pressurization, the acrylic type is more preferable. The adhesiveness between the gasket material 8 and the adhesive layer of the plastic film having the adhesive layer is determined as long as the adhesive force between the polymer electrolyte film 5 and the gasket material 8 is larger than the adhesive force between the gasket material and the plastic film having the adhesive layer. It is preferable because it is easy to apply the gasket material 8 to the film electrode joint.

Next, the production of the catalyst ink, the catalyst layer, and the membrane electrode assembly will be described. Various devices can be used for the dispersion treatment when producing the catalyst ink. For example, examples of the dispersion treatment include a treatment with a ball mill or a roll mill, a treatment with a shear mill, a treatment with a wet mill, and an ultrasonic dispersion treatment. Further, a homogenizer or the like that agitates by centrifugal force may be used.

The dispersibility and particle size of the dispersed catalyst ink can be measured by using, for example, the following method. First, for the catalyst ink that has been dispersed, the particle size of the dispersoid contained in the catalyst ink is measured using a particle size distribution measuring device that incorporates a laser diffraction / scattering method.

The equipment used and the measurement conditions are as follows.
Device name: Laser diffraction / scattering type particle size distribution measuring device Model number: MT3000II SERIES
Manufacturer: MICROTRACK MRB
Permeation setting: Absorption In the catalyst ink measured using the above particle size distribution measuring device, two or more and three or less peaks are confirmed. The frequency peak having a particle size in the range of 1.0 μm or more and 12 μm or less is the primary peak (P ₁ ), and the frequency peak having the particle size in the range of 0.3 μm or more and less than 1.0 μm is the secondary peak (P ₂ ). Then, it is preferable that the secondary peak / primary peak ratio (P ₂ / P ₁ ) is 1.2 or more and less than 2.0. Further, when the peak ratio is 1.0 or less, the entanglement between the catalyst and the electrolyte is weakened, the proton conductivity is lowered, and the output characteristics are impaired. Further, when the peak ratio is 2.0 or more, the entanglement between the catalyst and the electrolyte becomes excessively strong, the pores in the formed catalyst layer are narrowed, water clogging occurs, and the output characteristics are impaired.

Examples of the coating method for forming the catalyst ink on the coating substrate include a die method, a gravure method, a spray method, and the like, but the present invention is not limited. The coating base material on which the catalyst layer, which is a component of the membrane electrode assembly, is formed is the polyelectrolyte film 7 and the transfer base material, but the present invention is not limited.

In the case of production by the transfer method, the material constituting the transfer base material may be any material as long as it can form a catalyst layer on the surface thereof and can transfer the catalyst layer to the polymer electrolyte membrane 7. For example, polymers such as polyimide, polyethylene terephthalate, polypalvanic acid aramid, polyamide (nylon), polysulfone, polyether sulfone, polyether sulfone, polyphenylene sulfide, polyether ether ketone, polyetherimide, polyacrylate, polyethylene naphthalate, etc. Films can be used. Further, a heat-resistant fluororesin such as an ethylene tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroperfluoroalkyl vinyl ether copolymer, or polytetrafluoroethylene can also be used.

It is desirable that the ion exchange capacity of the cathode catalyst layer 5 and the anode catalyst layer 6 is IEC, and the IEC is 1.1 or more and 1.5 or less. In this range, the gas diffusivity and drainage property of the catalyst layer are enhanced, and good power generation performance can be obtained. On the other hand, when the IEC is less than 1.1, the entanglement between the polyelectrolyte 3 and the fibrous substance 4 is suppressed, and the polyelectrolyte 3 aggregates, which is not preferable. Further, when the IEC exceeds 1.5, the bond between the polymer electrolyte 3 and the conductive carrier 2 or the carbon fiber 4 becomes strong, and the drainage property deteriorates, which is not preferable.
From the above, it can be seen that the membrane electrode assembly having a carbon fiber-containing catalyst layer having an IEC of 1.1 or more and 1.5 or less exhibits high power generation performance.

The membrane electrode assembly, which is one of the embodiments of the present invention, is provided with the catalyst layer on at least one of the anode and the cathode, and by having such a configuration, a membrane electrode assembly having excellent power generation performance can be obtained. Be done.
According to the method for manufacturing a membrane electrode assembly described above, it is possible to manufacture a membrane electrode assembly in which catalyst layers are bonded to both sides of the polymer electrolyte membrane 7 in a good shape.

Hereinafter, the present invention will be specifically described with reference to Examples. However, the present invention is not limited to these examples.

First, a common manufacturing process will be described.
<Preparation of catalyst ink>
The catalyst ink for forming the catalyst layer is a dispersion solution of a fluoropolymer electrolyte (DE2020: manufactured by Chemers), platinum-supported carbon using platinum as a catalyst (TEC10E50E: manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.), a fibrous substance, and the like. It was composed of two kinds of alcohol and water, and the catalyst ink of the catalyst layer was prepared by mixing these with a ball mill.
<Measurement of particle size distribution of catalyst ink>
The particle size of the dispersoid contained in the catalyst inks produced in Examples 1 to 3 and Comparative Examples 1 to 3, which will be described later, was evaluated by a laser diffraction / scattering type particle size distribution measuring device.
<Formation of catalyst layer and manufacture of membrane-electrode assembly>
An anode catalyst layer and a cathode catalyst layer were formed on the polyelectrolyte film by an applicator to produce a membrane-electrode assembly.
<Power generation evaluation>
The carbon paper used as the gas diffusion layer was bonded and installed in the power generation evaluation cell so as to sandwich the membrane-electrode assembly prepared in Examples 1 to 3 and Comparative Examples 1 to 3, which will be described later.

Next, using a fuel cell measuring device, the cell temperature was set to 80 ° C., and the current and voltage were measured. Hydrogen was used as the fuel gas and air was used as the oxidant gas, and the flow rate was controlled by a constant utilization rate.
[Example 1]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is coated so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
[Example 2]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is applied so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
[Example 3]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is coated so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
[Comparative Example 1]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is applied so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
[Comparative Example 2]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is applied so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
[Comparative Example 3]
The cathode catalyst ink having a frequency peak ratio (P ₂ / P ₁ ) obtained by the particle size distribution measuring device is coated so that the platinum carrying amount of the cathode catalyst layer is 0.3 mg / cm ² . Then, a membrane-electrode assembly equipped with this was prepared.
<Evaluation result>
The table summarizes the values of P ₂ / P ₁ and output characteristics of Examples and Comparative Examples.

From Table 1, the output when the frequency peak ratio (P ₂ / P ₁ ) of Examples 1 to 3 is 1.2 or more and less than 2.0 is 906 to 970 mW / cm ² , and the frequency peak ratio of Comparative Examples 1 and 2 (P 2 / P 1). When P ₂ / P ₁ ) was less than 1.0, the output was 825 to 870 mW / cm ² . When the frequency peak ratio (P ₂ / P ₁ ) of Comparative Example 3 was 2.0 or more, the output was 892 mW / cm ² . From this result, it was found that the catalyst ink according to the present embodiment and the membrane-electrode assembly using the catalyst ink can obtain high output characteristics.

By adopting the catalyst layer and the membrane-electrode assembly according to the present embodiment, it is possible to have sufficient proton conductivity and gas diffusivity and to exhibit high output characteristics in the long term. That is, according to the present embodiment, the frequency peak ratio (P ₂ / P ₁ ) in the particle size distribution of the dispersoid contained in the catalyst ink is set to 1.2 or more and less than 2.0, whereby the solid polymer type is used. Provided are an electrode catalyst layer, a membrane-electrode assembly, and a polymer electrolyte fuel cell, which have sufficient gas diffusivity and proton conductivity in the operation of a fuel cell and can exhibit high power generation performance in the long term. be able to. Therefore, the present invention can be suitably used for a stationary cogeneration system, a fuel cell vehicle, or the like using a polymer electrolyte fuel cell, and has great industrial utility value.

1 ... Catalyst particles 2 ... Conductive carrier 3 ... Polymer electrolyte 4 ... Fibrous material 5 ... Cathode catalyst layer 6 ... Anodic catalyst layer 7 ... Polymer electrolyte film 8 ... Gasket material 9 ... Gas diffusion layer

Claims (4)

A catalyst ink for a polymer electrolyte fuel cell composed of catalyst particles, a conductive carrier, a polyelectrolyte, a fibrous substance, and a solvent.
The frequency peak (P1) in which the particle size in the dispersoid of the catalyst ink measured by the particle size distribution measuring device exists in the range of 1.0 μm or more and 12 μm or _less , and the particle size is 0.3 μm or more and less than 1.0 μm. A catalyst for a solid polymer fuel cell, which satisfies the equation (1) in which the ratio (P ₂ / P ₁ ) to the frequency peak (P ₂ ) existing in the range is 1.2 or more and less than 2.0. ink.
2.0 ＞ P ₂ / P ₁ ≧ 1.2 ・ ・ ・ ・ Equation (1) The solid polymer type according to claim 1, which is a catalyst ink for a solid polymer fuel cell, wherein the catalyst particles are a metal selected from platinum, palladium, ruthenium, iridium, rhodium, and osmium. Catalyst ink for fuel cells. The solid polymer fuel cell according to any one of claims 1 to 2, which is a catalyst layer for a polymer electrolyte fuel cell and is made of the catalyst ink for a polymer electrolyte fuel cell. Catalyst layer. The membrane-electrode assembly for a polymer electrolyte fuel cell, wherein the catalyst layer for a polymer electrolyte fuel cell is provided on at least one of an anode and a cathode, according to any one of claims 1 to 3. The membrane-electrode assembly for the polymer electrolyte fuel cell described.

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