JPH1116586A - Manufacture of high polymer electrolyte film-gas diffusion electrode body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the supplying property of reaction gas, reactive activity and catalytic activity, and proton conductivity of a high polymer electrolyte by applying a catalyst dispersion to a reaction part forming means while regulating its viscosity, pressing the reaction part forming means to an electrolyte, thereafter removing the reaction part forming means, and connecting a gas diffusing means to the reaction part. SOLUTION: A catalyst powder is added to a solution of high polymer electrolyte resin followed by stirring and mixing to prepare a catalyst dispersion. The temperature is raise while continuing the stirring to regulate the viscosity so as to be suitable to application. The catalyst dispersion is applied to a reaction part forming means less affinitive to the catalyst dispersion, for example, a sheet having excellent releasability. A reaction part is laminated on both sides or one side of a high polymer electrolyte film and pressed. The reaction part is transferred to the high polymer electrolyte film, and a polymer electrolyte-reaction part connected body is formed. The reaction part forming means is removed, the high polymer electrolyte film-reaction part connected body is laminated on a gas diffusion part, and connected by hot press to form a high polymer electrolyte film-gas diffusion electrode body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid polymer electrolyte fuel cell.

[0002]

2. Description of the Related Art A solid polymer electrolyte fuel cell has a structure in which gas diffusion electrodes are arranged on both sides of an ion exchange membrane (solid polymer electrolyte). It is a device that obtains electric power by reacting in an appropriate manner. The gas diffusion electrode includes a gas diffusion section and a reaction section. Platinum-based metal particles or carbon particles carrying these particles are applied as catalysts to the respective reaction sections of the anode and the cathode.

[0003] At the ^{_{anode, 2H 2 → 4H + + 4e}} - At the ^{_{cathode, O 2 + 4H + + 4e}} - → 2H 2 O electrochemical reaction proceeds. The gas diffusion section has a function of supplying a reaction gas to the reaction section and collecting current. Water generated by the reaction on the cathode side is discharged through the gas diffusion unit. Therefore, the gas diffusion portion is required to have gas permeability, conductivity, and water repellency. As the gas diffusion part, carbon paper or the like having water repellency is used.

[0004] As a method of forming a reaction part in a polymer electrolyte membrane, a mixture of a catalyst powder such as platinum powder or carbon powder carrying platinum and a binder such as polytetrafluoroethylene (PTFE) is heated on the electrolyte membrane. A method of pressure bonding (for example, US Pat. No. 3,134,697, Japanese Patent Publication No. 58-15544) and a method of electroless plating a catalyst metal on an electrolyte membrane (for example, Japanese Patent Publication No.
55-38934).

The electrochemical reaction occurs at the interface between the catalyst and the electrolyte in the reaction section, and the current-voltage characteristics of the cell using the gas diffusion electrode are greatly affected by the contact area between the catalyst and the electrolyte. When the electrolyte is a liquid, the electrolyte penetrates into the reaction part, and the contact area between the catalyst and the electrolyte spreads three-dimensionally and the contact area is large, whereas the electrolyte is a solid such as a polymer electrolyte membrane. In the case of, the contact portion between the catalyst and the electrolyte is limited to a two-dimensional interface, and the contact area is relatively small. That is, in the above method, the contact portion between the electrode and the electrolyte is limited to a two-dimensional contact interface, and the contact area is small.

On the other hand, in order to increase the contact area between the electrode and the electrolyte and improve the current-voltage characteristics of the cell, a solution of a polymer electrolyte resin is added to the reaction section, and the reaction between the catalyst and the electrolyte in the reaction section is performed. There is a method of forming a contact portion three-dimensionally to increase a contact area.

[0007]

For example, there has been proposed a method of forming a reaction part from a mixture of a solution of a catalyst powder, PTFE and a polymer electrolyte resin (Japanese Patent Publication No. 2-7398). However, in this method, the binder such as PTFE has no proton conductivity and has a lower permeability of the reaction gas than the polymer electrolyte resin. Therefore, if a binder such as PTFE is present in the reaction section, protons to the catalyst in the reaction section are not present. In addition, there is a problem that the supply of the reaction gas is hindered, and a problem that the contact area between the catalyst and the electrolyte decreases as the proportion of PTFE in the reaction section increases.

In addition, a method has been proposed in which a reaction section is formed of a catalyst powder and a polymer electrolyte resin without containing PTFE in the reaction section (Japanese Patent Publication No. 5-507583). In this production, a catalyst dispersion is prepared using a dispersion medium having a relatively high viscosity such as glycerol in order to make the viscosity of the dispersion medium of the catalyst powder and the polymer electrolyte resin appropriate. However,
In this method, the dispersion is applied to form a reaction part,
A step of heating to 135 ° C to remove these dispersion media is indispensable, and the sulfon group of perfluorocarbon sulfonic acid, which is a polymer electrolyte, starts to decompose at 125 ° C. There is a problem that conductivity is reduced. In addition, in order to avoid deterioration of the electrolyte membrane, a process of replacing the ion exchange group of the polymer electrolyte with a relatively heat-stable sodium ion type has been carried out. There is a problem that deterioration of the electrolyte is inevitable.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an excellent reaction gas supply property, a high reaction activity and a high catalytic activity, and a high proton conductivity of a polymer electrolyte. Another object of the present invention is to provide a polymer electrolyte membrane-gas diffusion electrode having excellent power generation capability and a solid polymer electrolyte fuel cell having excellent power generation capability using the electrode.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a polymer electrolyte membrane-gas diffusion electrode body comprising a gas diffusion electrode having a reaction section and a gas diffusion section provided on at least one of the polymer electrolyte membranes. A step of heating a catalyst dispersion having a catalyst, a polymer electrolyte resin and a dispersion medium at a temperature lower than the decomposition temperature of the polymer electrolyte resin to adjust the viscosity, and applying the catalyst dispersion to a reaction section molding means; Forming a reaction section, and pressing the reaction section forming means and the electrolyte membrane so that the reaction section faces the polymer electrolyte membrane; removing the reaction section forming means; and polymer electrolyte membrane-reaction. A step of forming a partial junction, and a step of joining gas diffusion means to a reaction section of the polymer electrolyte membrane-reaction junction.

A second invention according to the first invention is characterized in that the reaction section forming means is a release sheet.

A third invention according to the first or second invention is:
The method is characterized in that after the catalyst dispersion is applied to the reaction section molding means, the catalyst dispersion is dried at a temperature lower than the decomposition temperature of the polymer electrolyte resin.

[0013] A fourth invention according to the first, second or third invention is characterized in that the viscosity of the catalyst dispersion whose viscosity has been adjusted is 10,000 to 10,000.
It is 15000 cP.

Further, the present invention is characterized by combining the above inventions.

[0015]

According to the present invention, a dispersion of a catalyst powder containing no binder such as PTFE and a polymer electrolyte resin is heated at a temperature lower than the decomposition temperature of the polymer electrolyte resin to adjust the viscosity in advance, and By constructing the reaction section from the product, the amount of catalyst per unit volume is increased to increase the activity of the reaction section, and in particular, the thin and uniform reaction section is formed by screen printing to supply the reaction gas. In addition, since the polymer electrolyte resin is not deteriorated by heat in the process of forming the reaction portion, a reaction portion having excellent current-voltage characteristics and further improved proton conductivity can be provided. In addition, by setting the viscosity of the dispersion forming the reaction part to a specific value, it is possible to provide a more excellent polymer electrolyte membrane-gas diffusion electrode body and a fuel cell.

Generally, a solution of a polymer electrolyte resin has a property that when the solvent evaporates, a film of the polymer electrolyte resin as a solute is formed. Using this property, a cast film of the polymer electrolyte resin can be produced from a solution of the polymer electrolyte resin. The present invention makes use of this characteristic, in which a catalyst powder is dispersed in a cast membrane of a polymer electrolyte resin. In other words, the polymer electrolyte resin derived from the solution of the polymer electrolyte resin serves as a binder for the catalyst powder, and the reaction section of the present invention is composed of the polymer electrolyte resin and the catalyst powder. Therefore,
A binder such as PTFE becomes unnecessary, and the amount of catalyst applied per unit volume increases, so that a highly active reaction portion can be formed.

When a reaction section is prepared from a catalyst dispersion having a catalyst powder, a polymer electrolyte resin, and a dispersion medium, the catalyst dispersion and the catalyst powder relative to the dispersion medium (usually a mixture of water and alcohol) of the catalyst dispersion are prepared. The ratio with the molecular electrolyte resin is important. For example, when the proportion of the dispersion medium is excessive, the volume change of the mixture during formation of the cast film becomes large, causing cracks in the cast film and making it difficult to form a uniform reaction portion. However, in the present invention, by adjusting the ratio of the dispersion medium to the catalyst powder and the polymer electrolyte resin, a uniform reaction portion excellent in the supply of the reaction gas can be formed without cracking.

Further, depending on the coating method for forming the reaction part, it is necessary to adjust the viscosity of the mixture. Generally, a thickener such as glycerol will be used for adjusting the viscosity. In the present invention, the catalyst dispersion is heated at a temperature lower than the decomposition temperature of the polymer electrolyte resin without adding a thickener such as glycerol to the catalyst dispersion having the catalyst powder, the polymer electrolyte resin and the dispersion medium. Because the viscosity is adjusted, a reaction part with excellent proton conductivity can be formed without causing deterioration of the polymer electrolyte resin, and a reaction part is formed at a temperature below the boiling point of water, so rapid vaporization of the dispersion medium Thus, a change in volume due to the reaction can be avoided, and thus a uniform reaction portion can be formed.

In addition, in general, in the formation of a reaction part, a catalyst dispersion is applied to an electrolyte membrane or carbon paper as a gas diffusion part to form a reaction part. As the application method,
A brush coating method, a spray method, a precipitation method, a doctor blade method, a screen printing method and the like are known. However, it is inevitable that coating unevenness occurs in the brush coating method, it is difficult to control the coating thickness on the order of several microns, and it is difficult to make the coating amount and thickness uniform for each electrode by the spray method or the precipitation method. Yes, and it is difficult to form a reaction part having a sufficiently small thickness by the doctor blade method.

On the other hand, in the screen printing method, a thin and uniform reaction portion having a thickness of about 10 μm can be formed by appropriately selecting the viscosity of the catalyst dispersion and the mesh size of the screen. However, even when screen printing is used, when the catalyst dispersion is applied to the dry polymer electrolyte membrane, the membrane is wetted and deformed by the dispersion medium, and the proton-type wet polymer electrolyte membrane and the catalyst dispersion are dispersed. It is difficult to apply a catalyst dispersion having a polymer electrolyte, a catalyst powder, and a dispersion medium directly and uniformly to a polymer electrolyte membrane.

Therefore, a thin and uniform reaction section is formed in advance on a reaction section forming means having a low affinity for the catalyst dispersion, for example, a sheet having excellent releasability, and this is formed on the polymer electrolyte membrane, for example. By contacting and transferring by a roll press or the like, a very thin and uniform reaction portion can be formed on the polymer electrolyte membrane. At this time, since the dispersion medium of the catalyst dispersion is volatile at room temperature, a heating step is not required.

Further, by adjusting the viscosity of the dispersion to a specific value, the yield in each step can be eliminated, and the characteristics of the electrode body and the fuel cell can be improved.

[0023]

Next, an embodiment of a manufacturing method according to the present invention will be described with reference to the drawings.

FIG. 1 is a flow chart showing one embodiment of the method for producing a polymer electrolyte membrane-gas diffusion electrode body according to the present invention.

First, a catalyst powder, a solution of a polymer electrolyte resin and a dispersion medium are weighed appropriately as appropriate, and the catalyst powder is added to a solution of the polymer electrolyte resin. Prepare. Alternatively, the catalyst powder, the polymer electrolyte resin, and the dispersion medium are each appropriately weighed, and the catalyst powder is added to the polymer electrolyte resin solution, and the catalyst dispersion is prepared by sufficiently stirring and mixing. Good.

At this time, the temperature is increased (for example, 70 ° C.) while the stirring is continued, and partial drying is performed to remove a part of the dispersion medium composed of the mixture of water and alcohol derived from the solution of the polymer electrolyte resin. When this partial drying is performed, the viscosity of the catalyst dispersion increases, and the viscosity suitable for coating (preferably,
A catalyst dispersion of 10,000-15,000 cP) can be easily prepared.

This dispersion is applied to a reaction part forming means having a low affinity for the dispersion, for example, a sheet having excellent releasability.
As the sheet having excellent releasability, a sheet of tetrafluoroethylene-hexafluoropropylene copolymer, polytetrafluoroethylene, polychlorotrifluoroethylene or / and chlorotrifluoroethylene-ethylene copolymer (here, trade name And Daikin Industries Co., Ltd. (neoflon) can be used, and the catalyst dispersion having the adjusted viscosity is applied to this sheet by screen printing. After coating, leave it at room temperature for several minutes to dry it,
A reaction part having a thickness of 0 μm is formed. At this time, by appropriately selecting the mesh size of the screen to be used or the viscosity of the catalyst dispersion, the thickness of the reaction part can be selectively changed, and a reaction part of several μm to several tens μm can be formed. Can be.

Next, the polymer electrolyte membrane is laminated on both sides or one side thereof and pressed or hot-pressed so that the reaction section formed on the release sheet comes into contact with the polymer electrolyte membrane. Then, the reaction part is transferred to the polymer electrolyte membrane, and a joined body of the polymer electrolyte membrane and the reaction part is formed.

Next, the polymer electrolyte membrane-reaction unit assembly and a gas diffusion unit (for example, water-repellent carbon paper) are laminated and joined by hot pressing to form a polymer electrolyte membrane-gas diffusion electrode assembly. To form

FIG. 2 is a schematic view of a cross section of a polymer electrolyte membrane-gas diffusion electrode body according to an embodiment of the present invention.

As shown in the figure, a reaction section having a thickness of about 10 μm and a gas diffusion section are arranged on both sides of the polymer electrolyte membrane. The reaction section has a catalyst powder and a polymer electrolyte resin,
The gas diffusion portion is made of carbon paper provided with water repellency by PTFE. As a catalyst powder, a platinum-supported carbon catalyst in which a fine powder of platinum (average particle size, about several tens of millimeters) is provided on a carrier of carbon powder (for example, VULCAN CX72) is used. The electrolyte resin contains 15 to 50% by dry weight.

In this reaction part, the carbon powder carrying platinum forms a path for moving electrons, and the polymer electrolyte resin forms a path for moving protons. Further, since the thickness of the reaction part is small, the reaction gas permeates through the polymer electrolyte resin and is quickly supplied to the catalyst.

[0033]

【Example】

[Example 1] A commercially available Nafion solution (5 wt% , Aldrich Chemical Co., Ltd.). That is, 2 g of the catalyst powder was added to 15 g of the Nafion solution, and the mixture was sufficiently stirred and mixed. The polymer electrolyte resin (Nafion) contained in this catalyst dispersion was 27
wt%. In this state, the catalyst dispersion is a liquid having a low viscosity. While the vessel is heated to 70 ° C and agitated, part of the dispersion medium consisting of a mixture of water and alcohol derived from the Nafion solution is evaporated and partially dried, until the viscosity of the catalyst dispersion reaches about 12000 cP. went.

The catalyst dispersion having the adjusted viscosity is applied by screen printing to a neoflon sheet (neoflon is a trade name of Daikin Industries, Ltd.) and dried, and a film-like reaction part having a thickness of about 10 μm is formed on the sheet. Formed. The amount of platinum is about
It was 0.1 mg / cm2. This reaction part was cut into an electrode size of 5 cm x 5 cm, placed on both sides of the polymer electrolyte membrane so that the reaction parts faced, and pressed at 80 ° C and 150 kg / cm2 for 2 minutes. The reaction part was transcribed. Subsequently, the release sheet was removed to obtain a polymer electrolyte membrane-reacted part assembly.

At this time, Nafion 11 was used as the polymer electrolyte membrane.
Five membranes (DuPont) were used. Further, carbon paper provided with water repellency by PTFE was laminated on both sides of the joined body of the polymer electrolyte membrane and the reaction part,
The polymer electrolyte membrane-gas diffusion electrode body was prepared by pressing under the conditions of minutes. Hereinafter, this is referred to as a polymer electrolyte membrane-gas diffusion electrode body A according to the present invention.

Comparative Example 1 The catalyst dispersion prepared in Example 1 was directly applied to a proton-treated wet polymer electrolyte membrane: Nafion 115 by screen printing.
At this time, the compatibility between the catalyst dispersion and the polymer electrolyte was poor, and the amount of platinum applied could not be 0.1 mg / cm2 in a single application.

However, the applied reaction area was not uniform. The same water-repellent carbon paper as in the example was pressed onto the polymer electrolyte-reactor junction assembly (coated) thus produced at 120 ° C. and 150 kg / cm 2 for 2 minutes, and joined. An electrolyte membrane-gas diffusion electrode body B was produced.

Comparative Example 2 The catalyst dispersion prepared in the example was directly applied to the same water-repellent carbon paper as in the example by screen printing. The amount of platinum applied was 0.1 mg / cm2.

However, since the surface of the carbon paper was not smooth, a uniform reaction portion could not be formed. A gas diffusion electrode composed of this reaction part and a gas diffusion part is applied to a polymer electrolyte membrane: Nafion 115 at 120 ° C., 150 kg / cm 2,
Then, the polymer electrolyte membrane-gas diffusion electrode assembly C was formed by pressing and joining under the conditions of minutes.

[Comparative Example 3] The catalyst dispersion prepared in the example was directly applied to the same water-repellent carbon paper as in the example by a brush coating method, and a gas diffusion electrode comprising a reaction part and a gas diffusion part was formed. Produced. About 0.1mg / cm2 of applied platinum
And This gas diffusion electrode and polymer electrolyte membrane: Nafion11
5 and 120 ° C., 150 kg / cm 2, and pressed together for 2 minutes to form a polymer electrolyte membrane-gas diffusion electrode D.

Comparative Example 4 A conventionally known method, that is,
The weight ratio of the polymer electrolyte resin solution to the catalyst powder is 1: 3
In a mixture of carbon: water: glycerol in a weight ratio of 1:
Water and glycerol were added to adjust the viscosity of the dispersion to 5:20, and the dispersion was sprayed on a release sheet so that the amount of platinum was 0.1 mg / cm2, dried at 135 ° C. Produced. The amount of platinum applied was 0.1 mg / cm2. The reaction section thus produced was transferred to a polymer electrolyte membrane (Nafion 115) under the same conditions as in the example, and a water-repellent carbon paper was joined thereto to produce a polymer electrolyte membrane-gas diffusion electrode E.

[Experiment and Results] A fuel cell was constructed using the polymer electrolyte membrane-gas diffusion electrode body A according to the present invention produced as described above. This battery is referred to as a polymer electrolyte fuel cell A according to the present invention. Further, polymer electrolyte membrane-gas diffusion electrode bodies B, C, D and E prepared in Comparative Examples 1 to 4 were used to constitute solid polymer fuel cells. These cells are referred to as comparative fuel cells B, C, D and E, respectively.

Then, hydrogen gas as a fuel gas and oxygen gas as an oxidizing gas are supplied at atmospheric pressure, and the relationship between the cell voltage and current density of the fuel cell A of the present invention and the comparative fuel cells B, C, D and E is determined. Examined.

The operating conditions are shown below.

Operating temperature 65 ° C. Oxygen humidification temperature 60 ° C., hydrogen humidification temperature 60 ° C. Oxygen utilization rate 50%, hydrogen utilization rate 70% The results are shown in FIG. As is clear from FIG. 3, the fuel cell A of the present invention has better cell voltage-current density characteristics than any of the comparative cells. Comparative batteries B, C and D
Although the amount of platinum applied is the same, but the reaction zone is not uniform, it is considered that a small amount of the catalyst that is effectively acting is the cause of the deterioration in characteristics. In addition, since the reaction section of the comparative battery E is relatively uniform, the comparative battery B has better cell voltage-current density characteristics than the other comparative batteries B, C, and D, but the fuel cell A of the present invention further has Has excellent properties. This is because the glycerol was dried to prepare the reaction part of the comparative polymer electrolyte membrane-gas diffusion electrode body E.
In the heating process at a temperature of ° C., the polymer electrolyte contained in the reaction part was degraded by heat, and the proton conductivity in the reaction part was reduced, which is considered to be the cause of the deterioration in battery characteristics.
Therefore, it can be confirmed that the method for producing the polymer electrolyte membrane-gas diffusion electrode body at a temperature lower than the deterioration temperature of the polymer electrolyte resin is effective.

Example 2 A low-viscosity liquid catalyst dispersion comprising a solution of a platinum-supported carbon catalyst and a polymer electrolyte resin was prepared in the same manner as in Example 1. Then, by adjusting the degree of partial drying of a part of this dispersion medium,
Various catalyst dispersions with different viscosities were prepared. The viscosities of the prepared catalyst dispersions were 5000 cP and 10,000, respectively.
cP, 12000cP, 13500cP, 15000c
P, 17000 cP and 20000 cP.

Using these catalyst dispersions having different viscosities, a polymer electrolyte membrane was prepared in the same manner as in Example 1.
A gas diffusion electrode body was produced, and a fuel cell was respectively constructed from the gas diffusion electrode body.

[Experiment and Result] Under the conditions described in the experiment and result of Example 1, the relationship between the cell voltage and the current density of each of the fuel cells constructed in Example 2 was examined to form a reaction part. The effect of the viscosity of the catalyst dispersion on the battery characteristics was investigated.

FIG. 4 shows the result. In FIG. 4, the abscissa indicates the viscosity of the catalyst dispersion used when forming the reaction part, and the ordinate indicates the battery voltage at 800 mA / cm 2.

As can be seen from the figure, there is a correlation between the viscosity of the catalyst dispersion and the battery characteristics. Compared with the case where the viscosity is 12000 cP, the case where the viscosity is low: 5000 cP or the case where the viscosity is high: 20000 cP It can be seen that the battery characteristics deteriorate. This is because when a catalyst dispersion having a relatively low viscosity is used, when the screen is printed on the reaction section forming means and dried, the dispersion has a large volume change due to a relatively large amount of a dispersion medium, and cracks are generated. It is considered that the uniformity of the reaction part was impaired, and when a catalyst dispersion having a relatively high viscosity was used, when the screen printing was performed on the reaction part forming means, the catalyst dispersion remained on the screen, so that the uniformity was obtained. This is considered to be due to the fact that no reaction zone was formed.

As a result of examining the relationship between the viscosity of the catalyst-catalyst dispersion forming the reaction part and the battery characteristics, it was found that good battery voltage-current characteristics were obtained when the viscosity of the catalyst dispersion was 10,000 cP to 15000 cP. Was.

[0052]

As described above, the polymer electrolyte membrane-
The reaction part of the gas diffusion electrode body is thin and uniform, so it is excellent in the supply of reaction gas, and the amount of catalyst per unit volume is large, so the reaction activity is high, the catalyst activity is high, and the temperature at which the polymer electrolyte resin deteriorates Produced below, the proton conductivity increases. Therefore, it is possible to form a polymer electrolyte membrane-gas diffusion electrode body having excellent power generation capability, and it is possible to provide a solid polymer electrolyte fuel cell having excellent power generation capability using this assembly.

[0053]

[Brief description of the drawings]

FIG. 1 is a diagram showing a flow sheet for producing a polymer electrolyte membrane-gas diffusion electrode body of the present invention.

[0054]

FIG. 2 is a schematic view of a polymer electrolyte membrane-gas diffusion electrode body of the present invention.

[0055]

FIG. 3 is a comparison of cell voltage-current density characteristics of a fuel cell A of the present invention and comparative cells B, C, D and E.

FIG. 4 is a diagram showing the relationship between the viscosity of a catalyst dispersion and the cell voltage at 800 mAcm 2 of each fuel cell.

[0056]

[Explanation of symbols]

 1 polymer electrolyte membrane 2 reaction section 3 gas diffusion section

Claims (4)

[Claims] 1. A method for producing a polymer electrolyte membrane-gas diffusion electrode body comprising a gas diffusion electrode having a reaction part and a gas diffusion part on at least one of the polymer electrolyte membranes, wherein the catalyst, the polymer electrolyte resin and the catalyst are dispersed. The catalyst dispersion having a medium is heated at a temperature lower than the decomposition temperature of the polymer electrolyte resin,
A step of adjusting the viscosity, a step of applying the catalyst dispersion to the reaction section molding means to form a reaction section, and a step of forming the reaction section and the polymer electrolyte so that the reaction section faces the polymer electrolyte membrane. A step of pressing the membrane and removing the reaction section molding means to form a polymer electrolyte membrane-reaction section assembly; and a gas diffusion means joined to the reaction section of the polymer electrolyte membrane-reaction section assembly. And a method for producing a polymer electrolyte membrane-gas diffusion electrode assembly. 2. The method for producing a polymer electrolyte membrane-gas diffusion electrode body according to claim 1, wherein the reaction section forming means is a release sheet. 3. The polymer electrolyte membrane according to claim 1, wherein the catalyst dispersion is applied to a reaction section molding means and then dried at a temperature lower than a decomposition temperature of the polymer electrolyte resin. A method for manufacturing a gas diffusion electrode body. 4. The viscosity-controlled catalyst dispersion has a viscosity of 1
4. The method for producing a polymer electrolyte membrane-gas diffusion electrode body according to claim 1, wherein the pressure is 0000 to 15000 cP.