JPH0888011A - Solid polymer electrolyte fuel cell - Google Patents

Abstract

PURPOSE: To enhance electrode reaction and increase the contact of an electrolyte catalyst layer with gas by forming a catalyst layer and a eutectoid layer in a solid polymer electrolyte film, and connecting to a gas diffusion layer to form an electrode-electrolyte film connecting body. CONSTITUTION: A solid polymer electrolyte film 1, a hydrogen electrode 3 and an oxygen electrode 4 having gas diffusion layers 8, 10 facing each other through the film 1 are arranged. Catalyst layers 7, 9 are arranged on the film 1 side of the diffusion layers 8, 10, and eutectoid layers 2 formed by co- depositing an active component are formed on one surface of the film 1, and both surfaces of the film 1 are connected to the diffusion layers 8, 10 to form an electrode-electrolyte film connecting body. Thereby, since the eutectoid layers 2 and the catalyst layer 9 of the electrode 4 are made of a similar component, they can be joined by hot pressing, adhesion between the electrode and the electrolyte film interface is enhanced, proton movement of the hydrogen electrode 3 and the oxygen electrode 4 is made easy. The active component is dispersed together with carbon carrier by co-deposition with a reducing agent on the surface of the film 1 to arrange the catalyst layer 7 necessary for electrode reaction, thereby, the catalyst layer 7 can be made thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell, and more particularly to a solid polymer electrolyte fuel cell applicable to solid polymer electrolyte hydrogen-oxygen fuel cells in general.

[0002]

2. Description of the Related Art In a conventional solid polymer electrolyte fuel cell, generally, two current collectors, a solid polymer electrolyte membrane (hereinafter referred to as an electrolyte membrane), and a solid polymer electrolyte membrane face each other. And a hydrogen electrode and an oxygen electrode each having a gas diffusion layer, and means for supplying the hydrogen-containing gas or the oxygen-containing gas to the hydrogen electrode or the oxygen electrode. The two electrodes are a catalyst, a carrier carrying this catalyst, and a solid polymer ionic (proton) conductor similar to the electrolyte membrane.
It consists of a binder that hardens these. The two electrodes are a hydrogen electrode and an oxygen electrode, and the electrochemical reaction at each electrode is as follows.

At the hydrogen electrode, hydrogen molecules are ionized to become protons and emit electrons. This electrochemical reaction can be represented by the formula (Formula 1).

[0004]

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Protons conduct through the ionic conductor in the electrode, reach the electrolyte membrane, pass through the electrolyte membrane, and move to the oxygen electrode on the opposite side. On the other hand, the emitted electrons move to the oxygen electrode through the external circuit. At the oxygen electrode, the proton is combined with the electron released from the hydrogen electrode according to the formula (2) to generate water.

[0006]

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The above reaction process of the fuel cell mainly comprises the following four stages. (A) Diffusion of hydrogen and oxygen to the catalyst surface, (B) Reaction on the catalyst surface in the hydrogen electrode and oxygen electrode, (C) Conduction of protons inside both electrodes and inside the electrolyte membrane, (D) Release of produced water The degree of diffusion of the fuel gas and the degree of reaction rate at each stage greatly affect the cell output characteristics.

In the step (A), the fuel is efficiently supplied to the catalyst surface and diffused, and therefore, the method is disclosed in JP-A-60-354.
It is proposed to use the corrugated current collector shown in FIG. 1 of Japanese Unexamined Patent Publication No. 72 or the carbon plate having a rectangular groove disclosed in Japanese Unexamined Patent Publication No. 3-102774 and Japanese Unexamined Patent Publication No. 2-86071. Has been done. When the grooved side of the corrugated current collector or the carbon plate having the rectangular groove is brought into contact with the electrode, a space is created on the contact surface, and the fuel diffuses to the electrode surface through this space. In the solid polymer electrolyte fuel cell, the structure as described above is usually adopted, and the output is exhibited to some extent.

The protons that have passed through the electrolyte membrane undergo the electrochemical reaction of the formula (2) at the interface between the electrolyte membrane and the oxygen electrode, so that water is generated at the oxygen electrode interface. Formed, causing a so-called flooding phenomenon. Due to this water film, diffusion of oxygen gas in the electrode becomes difficult, the power density decreases, and the battery performance becomes unstable. This flooding phenomenon is particularly likely to occur at the interface between the oxygen electrode and the electrolyte membrane. Therefore, it is necessary to remove this generated water outside the system.

Therefore, in US Pat. No. 4,643,957, the water repellency of the electrodes is controlled to eliminate the flooding phenomenon. Further, as disclosed in JP-A-4-169069, an electrolyte membrane is previously formed. It has been proposed to improve the cell reaction rate by forming irregularities and joining them to the gas diffusion electrode.

As described above, water is added to the hydrogen electrode in order to prevent the electrolyte membrane from drying and to promote the migration of protons. However, when the water repellency of the catalyst layer is insufficient, the water causes the catalyst The pores are covered to prevent gas diffusion,
If the contact between the catalyst layer and the electrolyte membrane interface is insufficient, the migration of protons is impaired. At the oxygen electrode, it promotes the discharge of water accompanied by protons from the hydrogen electrode and the water produced by the electrode reaction to the outside of the system, and at the same time improves the diffusivity of oxygen gas required for the electrode reaction. It is necessary to promote the transfer of protons from the.

[0012]

In the conventional solid polymer electrolyte fuel cell, the protons that have passed through the electrolyte membrane undergo the electrochemical reaction of the formula (2) at the interface between the electrolyte membrane and the oxygen electrode. As a result, water is generated at the oxygen electrode interface, and this water film makes it difficult to diffuse oxygen gas in the electrode, resulting in a decrease in power density and instability in battery performance.

The object of the present invention is to carry out the electrode reaction of the hydrogen electrode and the oxygen electrode with high efficiency, so that the migration of protons is promoted in the hydrogen electrode, the flooding phenomenon of water is prevented in the oxygen electrode, and the electrode catalyst layer is formed. It is an object of the present invention to provide a solid polymer electrolyte fuel cell having an electrode structure that improves the contact efficiency with gas and accelerates the redox reaction that occurs at the interface between the electrode and the electrolyte membrane.

[0014]

In order to achieve the above-mentioned object, a solid polymer electrolyte fuel cell according to the present invention is provided with a solid polymer electrolyte membrane and a solid polymer electrolyte membrane so as to face each other. In a solid polymer electrolyte fuel cell comprising a hydrogen electrode and an oxygen electrode having a gas diffusion layer, and a means for supplying a hydrogen-containing gas or an oxygen-containing gas to the hydrogen electrode or the oxygen electrode, at least the hydrogen electrode and the oxygen electrode A catalyst layer is provided on the solid polymer electrolyte membrane side of either one of the gas diffusion layers, and at least one of the surfaces of the solid polymer electrolyte membrane is provided with a co-deposition layer of eutectoid active ingredient,
The solid polymer electrolyte membrane is bonded to the gas diffusion layer to form an electrode-electrolyte membrane assembly.

The eutectoid layer may be composed of at least a carbon carrier, an active component supported on the carbon carrier, a proton conductor and a water repellent binder.

The active ingredient carried on the eutectoid layer may have a higher concentration than the active ingredient carried on the catalyst layer.

Further, the active component of the eutectoid layer may be formed so that the eutectoid amount on the hydrogen electrode side is smaller than the eutectoid amount on the oxygen electrode side.

The solid polymer electrolyte membrane may be made of a perfluorosulfonic acid resin or a perfluorocarboxylic acid resin.

The active ingredient may be composed of a platinum group metal.

Further, in the method for producing the electrode-electrolyte membrane assembly, the solid polymer electrolyte membrane is placed in a closed container, the platinum compound is added to the upper portion of the solid polymer electrolyte membrane, and the carbon carrier and the proton conduction are added. Add a certain amount of body and water-repellent binder and stir, add a reducing agent to the bottom of the solid polymer electrolyte membrane, heat the closed container to a predetermined temperature to reduce the platinum compound for a predetermined time, and solid polymer The eutectoid layer is formed on the electrolyte membrane, and the carbon powder electrode catalyst supporting carbon powder or platinum is kneaded together with the proton conductor and the water repellent binder to form a paste, which is applied to the gas diffusion layer at a predetermined temperature. To form a hydrogen electrode and an oxygen electrode, and the solid polymer electrolyte membrane is bonded to the gas diffusion layer by hot pressing.

In the electric body, any one of the solid polymer electrolyte fuel cells described above is provided in the mobile power source.

[0022]

According to the present invention, the active ingredient is carried on both sides of the electrolyte membrane by eutectoid, and the active ingredient is sandwiched between the hydrogen electrode and the oxygen electrode and integrated with the electrode-electrolyte membrane assembly, whereby both electrodes and the electrolyte are integrated. Adhesion with the membrane is improved, and by disposing the active ingredient at or near the interface of the electrolyte membrane, the internal resistance is reduced and the migration of protons is facilitated. Furthermore, since the active ingredient in an amount necessary for the electrode reaction is placed on the surface of the electrolyte membrane, the active ingredient can be reduced. Further, the catalyst layers on both electrodes need only be used for the diffusion of gas, and therefore are thinned. Therefore, in the hydrogen electrode, the electrolyte membrane is replenished with sufficient water, and the proton transfer resistance is also reduced. Further, also in the oxygen electrode, since the interface of the electrolyte membrane and the catalyst layer are arranged in close contact with each other, the movement of protons from the electrolyte membrane is facilitated and the electrode reaction is promoted. Moreover, since the catalyst layer of the electrode is thinned, the flooding phenomenon due to the water supplied from the electrolyte membrane or the generated water is prevented. As a result, it becomes possible to expand the effective reaction area and maintain stable, and it is possible to realize a battery with high output density and stable performance.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, a solid polymer electrolyte membrane 1, and a hydrogen electrode 3 and an oxygen electrode 4 that are provided opposite to each other with the solid polymer electrolyte membrane 1 and have gas diffusion layers 8 and 10, A solid polymer electrolyte fuel cell comprising a means (current collector) 5 for supplying a hydrogen-containing gas or an oxygen-containing gas to the hydrogen electrode 3 or the oxygen electrode 4, wherein at least one of the hydrogen electrode 3 and the oxygen electrode 4 is provided. One of the gas diffusion layers 8 and 10
The solid polymer electrolyte membrane 1 is provided with catalyst layers 7 and 9 and at least one surface of the solid polymer electrolyte membrane is provided with a co-deposition layer 2 containing at least an active ingredient. Both surfaces of No. 1 are bonded to the gas diffusion layers 8 and 10 to form an electrode-electrolyte membrane assembly.

The current collector 5 is provided with some gas supply grooves. Two current collectors 5 are faced to each other, the electrolyte membrane 1 and the hydrogen electrode 3 and the oxygen electrode 4 are sandwiched between them, and a gas seal member 6 prevents gas from leaking.

FIG. 2 is an enlarged view of the electrolyte membrane and both electrodes shown in FIG. 1, showing the solid polymer electrolyte membrane 1 of this embodiment, its eutectoid layer 2, the hydrogen electrode 3 and the oxygen electrode 4. The respective layouts are shown. The solid polymer electrolyte membrane 1 has eutectoid layers 2 on both sides, the hydrogen electrode 3 is composed of a hydrogen electrode catalyst layer (catalyst layer) 7 and a gas diffusion layer 8 acting as an electron conductor, and the oxygen electrode 4 is oxygen. The electrode catalyst layer (catalyst layer) 9 and the gas diffusion layer 10 acting as an electron conductor are formed. An electrolyte membrane eutectoid layer (eutectoid layer) 2;
Hydrogen electrode catalyst layer 7, gas diffusion layer 8, oxygen electrode catalyst layer 9
And the gas diffusion layer 10 are arranged as described above and are pressed and integrated by hot pressing. Each catalyst layer is obtained by mixing active components, carbon, a proton conductor, a water-repellent binder and the like and molding. Further, in the above structure, each catalyst layer may be omitted if the active component is sufficiently supported on the electrolyte membrane by eutectoid. Furthermore, if the eutectoid layer is provided on either side, the adhesion between the electrolyte membrane interface and the electrode is improved. the important thing is,
The eutectoid layer was provided on the electrolyte membrane.

As described above, since the eutectoid layer is provided on the electrolyte membrane, and the eutectoid layer and the catalyst layer of the electrode are composed of the same components, both of them are hot-pressed to form an electrode-electrolyte membrane assembly (hereinafter , An integrated electrode), the adhesion between the electrode and the electrolyte membrane interface is improved, and the migration of protons at the hydrogen electrode and the oxygen electrode is facilitated. In addition, the active ingredient is added to the surface of the electrolyte membrane by a reducing agent or the like, the carbon carrier, the active ingredient and PTFE.
By dispersing (polytetrafluoroethylene) by eutectoid, the catalyst layer necessary for the electrode reaction can be arranged, and the catalyst layer can be thinned. Therefore,
At the hydrogen electrode, the electrode reaction is further promoted, and at the oxygen electrode, the movement of water is easier, so that the water can be easily discharged from the system, and the battery performance is improved by improving the interface between both electrodes and the electrolyte membrane. And can be stabilized. Furthermore, by making the active component concentration of the eutectoid layer higher than that of each catalyst layer, the electrode reaction at the electrolyte membrane interface is facilitated at the hydrogen electrode, and the proton migration resistance can be reduced at the oxygen electrode, resulting in improved battery performance. improves. Further, since the catalyst layer necessary for the electrode reaction can be carried on the interface of the electrolyte membrane by eutectoid, the catalyst layer of the electrode can be omitted, and therefore the integrated electrode can be made thin. On the other hand, since hydrogen gas diffuses quickly, the hydrogen electrode has a higher electrode reaction efficiency than the oxygen electrode. Therefore, the amount of the active ingredient in the hydrogen electrode can be reduced, and the active ingredient can be reduced.

The electrolyte membrane co-deposition layer, the hydrogen electrode catalyst layer and the oxygen electrode catalyst layer are composed of a carbon carrier, an active component (catalyst) carried thereon, a proton conductor and a water repellent binder. The active ingredient is preferably platinum or a platinum group metal such as rhodium, ruthenium, palladium or iridium, and the material of the proton conductor may be the same as or different from that of the electrolyte membrane. A fluororesin such as PTFE is effective as the water-repellent binder.

The electrolyte membrane used in the present invention is generally in the form of a membrane, and its material is generally used solid polymer electrolyte such as perfluorosulfonic acid resin or perfluorocarboxylic acid resin. Resins are preferred.

In order to control the water repellency of the electrode, the amount of water repellent binder added to the catalyst layer is changed. The water-repellent binder is preferably a fluororesin such as PTFE, but cannot be contained in a large amount because it is an electrical resistor.
For example, when the water-repellent binder is PTFE, the amount thereof is relative to the total amount of each of the hydrogen electrode catalyst layer and the oxygen electrode catalyst layer,
The oxygen electrode is 10 to 40% by weight, preferably 10 to
It is 30% by weight, and the hydrogen electrode is 20 to 50% by weight, preferably 20 to 40% by weight.

The ionic conductor (proton conductor) for increasing the effective reaction surface area by adding it to the hydrogen electrode catalyst layer and the oxygen electrode catalyst layer is chemically used because it is exposed to oxidizing and reducing atmospheres. Particularly preferred are highly stable perfluorosulfonic acid-cation exchange resins and perfluorocarboxylic acid resins.

The co-deposition method of the active component of the electrolyte membrane is a method of co-depositing the carbon powder, the active component, the proton conductor and the water-repellent binder by chemical plating on the surface of the electrolyte membrane. When co-deposited by this method, the concentration of the active ingredient can be arbitrarily changed depending on the amount of the active ingredient added to the eutectoid solution. Further, by diffusing the reducing agent from the back surface of the surface of the electrolyte membrane to be co-deposited, it can be co-deposited not only on the surface of the electrolyte membrane but also inside thereof.

A coating method is suitable for preparing the electrode. In this method, a carbon carrier catalyst supporting an active ingredient in advance, a proton conductor and a water-repellent binder are mixed and applied to an electron conductor which is a gas diffusion layer. When the electrode is prepared by this method, the gas diffusivity of the electrode can be adjusted by the water-repellent binder and can be arbitrarily selected.

As another embodiment of the present invention, an electric body of an electric vehicle, a submarine or the like has a structure in which any one of the solid polymer electrolyte fuel cells is provided for a mobile power source.

Each embodiment will be described in detail below. (Example 1) Example 1 in which an active ingredient is co-deposited on an electrolyte membrane
Will be explained. Set the electrolyte membrane in the center of the sealed container was added platinum compound such that 0.5 mg / cm ² of platinum thereon, graphite and 0.5 mg / cm ^2, PT
0.5 mg / cm ^{2 of} FE, a suitable amount of a proton conductor and water are added and stirred. An aqueous solution of hydrazine, which is a reducing agent, is placed below the electrolyte membrane. The closed container is heated to 60 ° C. for reduction. The reduction time of platinum was 2 hours. After the reduction, the product was washed with water to obtain an electrolyte membrane holding the eutectoid layer. As the electrolyte membrane, Nafion 117 manufactured by Du Pont was used. The thickness of the eutectoid layer at this time is 3 μm.

The hydrogen electrode and the oxygen electrode were prepared as follows. Platinum-supported carbon powder electrode catalyst is used as a proton conductor perfluorosulfonic acid cation exchange resin
(Nafion liquid manufactured by Aldrich Chemical Co.), and PTFE
The mixture was thoroughly kneaded with the water-based suspension of 1 to prepare a paste, which was applied to a carbon paper having a thickness of 100 μm, which is an electron conductor (gas diffusion layer). It was dried at 80 ° C. to obtain an electrode. The electron conductor is PTF on the carbon paper.
An aqueous suspension of E was applied at a rate of a coated amount of PTFE of 12 mg / cm ² and baked at 350 ° C. in the air to obtain. The composition of the hydrogen electrode was platinum amount: 0.3 mg / cm ² , proton conductor: 3
0% by weight, PTFE; 30% by weight. The composition of the oxygen electrode was 0.3 mg / cm ² of platinum, the same proton conductor as above 20% by weight, and PTFE: 20% by weight.

The electrolyte membrane and the electrode were joined by the hot pressing method. The method is such that a hydrogen electrode and an oxygen electrode are arranged on both sides of an electrolyte membrane and the temperature is 1 at a pressure of 100 kg / cm ^2.
It pressed at 20 degreeC for 15 minutes, and obtained the integrated electrode.

For comparison with this example, an untreated electrolyte membrane
(Dafont Nafion 117) was used to prepare an integrated electrode under the same conditions using the hydrogen electrode and the oxygen electrode.

A battery was assembled using the electrodes produced as described above, hydrogen and air were supplied as reaction gases, and the current density-voltage characteristics were measured under the conditions of 80 ° C. and 1 atm. The result is shown in FIG. The battery 12 of the comparative example showed a limiting current density of about 600 mA / cm ² , while the battery 11 of Example 1 had a limiting current density of more than 750 mA / cm ² . Thus, by providing the eutectoid layer in which the active component was eutectoid on the electrolyte membrane, the battery performance could be significantly improved.

Example 2 The active ingredient was co-deposited on the electrolyte membrane according to the following procedure. An electrolyte membrane was set in the center of the closed container, and an appropriate amount of water and carbon carrier (Carbon Black BP-2000Cabot) were mixed on the upper part, and 10 wt% platinum was carried in the mixed solution. Chloroplatinic acid solution was added as described above, and PTFE, sodium hydroxide and formalin were mixed therein. The lower part corresponding to the back surface of the electrolyte membrane was filled with formalin for supplementation when the formalin of the mixed solution was insufficient. The sealed container was heated to 60 ° C. and reduced for 2 hours, and the electrolyte membrane obtained was subjected to hot pressing using the same hydrogen electrode and oxygen electrode as in Example 1 to obtain an integrated electrode. Hereinafter, the results obtained by comparison with Example 1 under the same conditions are shown in FIG. From the curve showing the performance of the battery 13 of Example 2, the limiting current density was about 700 mA.
It was / cm ² .

Example 3 An electrolyte membrane prepared under the same conditions as in Example 1 was used except that the active ingredient in the eutectoid layer of the electrolyte membrane was 0.7 mg / cm ² . The hydrogen electrode and the oxygen electrode were prepared as follows. The composition of the hydrogen electrode is platinum amount; 0.1 mg /
cm ² , proton conductor; 20% by weight, PTFE: 20% by weight. The composition of the oxygen electrode is platinum amount; 0.1 mg / cm ² ,
The same proton conductor as above; 10% by weight, PTFE; 1
It was set to 0% by weight. It was formed so that the thickness of the catalyst layers on both electrodes was about 20 μm.

The above-mentioned electrolyte membrane and the electrode were joined by a hot pressing method to form an integrated electrode. The results obtained by performing the comparison under the same conditions as in Example 1 are shown in FIG. From the curve showing the performance of the battery 14 of Example 3, the limiting current density was about 750 mA / cm ² . Thus, the amount of active components in the eutectoid layer of the electrolyte membrane can be increased and the catalyst layers of both electrodes can be thinned.

As is clear from the above results, according to the present invention, the activity of the oxygen electrode and the hydrogen electrode of the solid polymer electrolyte fuel cell can be greatly improved as compared with the conventional one, and the output power is about 1.5 times. It is possible to obtain the density.

[0043]

EFFECTS OF THE INVENTION According to the present invention, since the eutectoid layer supporting the active component is provided on both sides of the electrolyte membrane, the electrode-electrolyte membrane assembly can be formed and the activity of the electrode can be improved. It has the effect of reducing the components and improving the battery performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing the electrode-electrolyte membrane assembly of FIG.

FIG. 3 is a graph showing the relationship between the current density and voltage characteristics of the fuel cell according to Example 1.

FIG. 4 is a graph showing the relationship between the current density and voltage characteristics of the fuel cell according to Example 2.

5 is a graph showing the relationship between the current density and voltage characteristics of the fuel cell according to Example 3. FIG.

[Explanation of symbols]

 1 Solid Polymer Electrolyte Membrane 2 Eutectoid Layer 3 Hydrogen Electrode 4 Oxygen Electrode 5 Current Collector 6 Gas Seal 7 Catalyst Layer 8 Gas Diffusion Layer 9 Catalyst Layer 10 Gas Diffusion Layer

Claims (8)

[Claims] 1. A solid polymer electrolyte membrane, a hydrogen electrode and an oxygen electrode having a gas diffusion layer which are provided so as to face each other with the solid polymer electrolyte membrane interposed therebetween, and a hydrogen-containing gas or an oxygen-containing gas is supplied to the hydrogen electrode. Alternatively, in a solid polymer electrolyte fuel cell having a means for supplying to the oxygen electrode, a catalyst layer on the solid polymer electrolyte membrane side of the gas diffusion layer of at least one of the hydrogen electrode and the oxygen electrode Along with the provision, a co-deposition layer in which at least an active ingredient is co-deposited is provided on at least one surface of the solid polymer electrolyte membrane, and the solid polymer electrolyte membrane is bonded to the gas diffusion layer to form an electrode-electrolyte membrane. A solid polymer electrolyte fuel cell, which is formed in a joined body. 2. The eutectoid layer comprises at least a carbon carrier, an active component supported on the carbon carrier, a proton conductor and a water-repellent binder, and the solid height according to claim 1. Molecular electrolyte fuel cell. 3. The solid polymer electrolyte according to claim 1, wherein the active ingredient carried on the eutectoid layer has a higher concentration than the active ingredient carried on the catalyst layer. Type fuel cell. 4. The active ingredient of the eutectoid layer is formed such that the eutectoid amount on the hydrogen electrode side is smaller than the eutectoid amount on the oxygen electrode side. A solid polymer electrolyte fuel cell according to the item. 5. The solid polymer electrolyte type according to claim 1, wherein the solid polymer electrolyte membrane is formed of a perfluorosulfonic acid resin or a perfluorocarboxylic acid resin. Fuel cell. 6. The solid polymer electrolyte fuel cell according to claim 1, wherein the active component is a platinum group metal. 7. A solid polymer electrolyte membrane is placed in a closed container, a platinum compound is added to the upper part of the solid polymer electrolyte membrane, and a predetermined amount of carbon carrier, proton conductor and water-repellent binder is added. Add and stir, add a reducing agent to the lower part of the solid polymer electrolyte membrane, heat the closed container to a predetermined temperature to reduce the platinum compound for a predetermined time, and eutectoid layer on the solid polymer electrolyte membrane The carbon powder electrode catalyst supporting the carbon powder or platinum is kneaded together with the proton conductor and the water-repellent binder to form a paste, which is applied to the gas diffusion layer and dried at a predetermined temperature to form a hydrogen electrode. And forming an oxygen electrode,
A method for producing an electrode-electrolyte membrane assembly, which comprises joining the solid polymer electrolyte membrane to a gas diffusion layer by hot pressing. 8. An electric body comprising the solid polymer electrolyte fuel cell according to claim 1 as a mobile power source.