JP2002117862A - Cell for solid high polymer type fuel cell, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a power generation performance of a cell by making a distribution of an ion conductivity resin in a reaction layer uniform. SOLUTION: In the cell for solid high polymer type fuel cells which sandwich both the sides of the solid high polymer film in the reaction layer, the ion conductivity resin has sufficient concentration for a hydrogen-ion density to move inside of the reaction layer, while the ion conductivity resin is uniformly distributed in the reaction layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer electrolyte fuel cell (PEFC: Polymer Electrolyt).
e Fuel Cell) and a method for manufacturing the same.

[0002]

2. Description of the Related Art As is well known, the basic structure of a polymer electrolyte fuel cell is shown in FIG. The fuel cell 1 includes a PEFC cell 2, separators 3 a and 3 b disposed at both ends of the cell 2 to sandwich the cell 2, and a diffusion layer 4 disposed between the cell 2 and the separators 3 a and 3 b.
It is composed of

[0003] The PEFC cell 2 comprises a solid polymer film 5.
And reaction layers 6 a and 6 b disposed on both sides of the film 5. The diffusion layer 4 is made of carbon paper 7
And a slurry layer 8 formed on one of the main surfaces. A groove 9 for flowing hydrogen gas is formed on the cell side of the separator 3a.
Is formed with a groove 10 for flowing air.

In the PEFC having such a configuration, the cell is formed, for example, by applying a mixed solution of Pt-supported carbon particles, a polymer (electrolyte), water and ethanol to both surfaces of a solid polymer film, and then drying. It is formed.

Conventionally, as a specific example of a cell for PEFC, a cell shown in FIGS. 2A and 2B is known (U).
SP. 5, 211, 984). Here, FIG. 2A is a sectional view showing the whole of the cell, and FIG. 2B is an enlarged view of a main part of FIG. 2A.

Reference numeral 11 in the drawing denotes a solid polymer membrane, and an anode layer (electrode layer) 14 and a cathode layer (electrode layer) 15 are arranged on both sides of the membrane 11 through catalyst layers 12 and 13, respectively. ing. An anode 16 is connected to the anode layer 14, and a cathode 17 is connected to the cathode layer 15. Further, a fuel gas 18 is introduced into the anode layer 14 side, and an oxidant 19 is introduced into the cathode layer 15. The catalyst layer 12 (or 13)
Has a structure in which carbon particles 21 and a Pt catalyst 22 are supported on an ionomer 20. Note that the catalyst layer and the electrode layer in FIG. 2 correspond to the reaction layer in FIG.

[0007]

However, according to the conventional PEFC cell, it is difficult to control the distribution of carbon particles (ion-conductive resin) in the reaction layer, and the ion migration resistance in the reaction layer is difficult. However, there is a problem that the power generation performance of the cell is lowered. This is because the concentration distribution of the ionic conductive resin in the reaction layer is large on the outside and small near the boundary with the solid polymer film as shown by the curve (a) in FIG. 6, and the concentration distribution is not uniform. It is.

The present invention has been made in view of such circumstances, and the ion conductive resin is uniformly distributed in the reaction layer, and the ion conductive resin has a hydrogen ion concentration that moves in the reaction layer. The purpose of the present invention is to provide a cell for a polymer electrolyte fuel cell capable of maintaining the power generation performance of the cell by making the distribution of the ionic conductive resin in the reaction layer uniform by adopting a structure having a sufficient concentration for the cell. I do.

Further, the present invention provides a structure in which the ion-conductive resin is distributed in the reaction layer so as to gradually increase from the outside toward the boundary between the reaction layer and the solid polymer film, so that the cell can be formed. An object of the present invention is to provide a cell for a polymer electrolyte fuel cell that can maintain power generation performance.

Further, the present invention provides a method of coating a slurry comprising a mixture of a conductive material carrying a catalyst, a polymer material and a solvent on a sheet having good releasability and drying it to remove the solvent in the slurry. And manufacturing a cell for a polymer electrolyte fuel cell capable of maintaining the power generation performance of the cell by holding the solid polymer membrane while applying pressure from both sides while keeping the sheet outside, and then peeling the sheet. The aim is to provide a method.

Further, the present invention provides a method in which a slurry obtained by mixing a conductive material carrying a catalyst, a polymer material, and a solvent is directly applied to both surfaces of a solid polymer film and dried to remove the solvent in the slurry. An object of the present invention is to provide a method for producing a cell for a polymer electrolyte fuel cell, which can maintain the power generation performance of the cell by thermocompression bonding the dried slurry and the solid polymer membrane after the drying.

[0012]

Means for Solving the Problems The first invention of the present application is directed to a polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched between reaction layers, wherein the ion-conductive resin is uniformly formed in the reaction layer. The polymer electrolyte fuel cell is characterized in that the ion-conductive resin is distributed and has a sufficient hydrogen ion concentration to move in the reaction layer.

The second invention of the present application is directed to a polymer electrolyte fuel cell in which both sides of a solid polymer membrane are sandwiched by a reaction layer, wherein an ion-conductive resin is provided inside the reaction layer from the outside. A cell for a polymer electrolyte fuel cell, wherein the cells are distributed so as to gradually increase toward the boundary of the membrane.

According to a third aspect of the present invention, there is provided a method for manufacturing a polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched between reaction layers, comprising a conductive material carrying a catalyst, a polymer material, and a solvent. Applying a slurry obtained by mixing on a sheet having good mold release properties, a step of drying to remove the solvent in the slurry, and applying a pressure to the solid polymer film from both sides with the sheet being outside. And a step of peeling off the sheet, and a method of manufacturing a cell for a polymer electrolyte fuel cell, comprising the steps of:

According to a fourth aspect of the present invention, there is provided a method of manufacturing a polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched between reaction layers, comprising a conductive material carrying a catalyst, a polymer material, and a solvent. And a step of directly applying a slurry obtained by mixing the two on both surfaces of the solid polymer film, a step of drying to remove the solvent in the slurry, and a step of thermocompression bonding the dried slurry and the solid polymer film. A method for producing a cell for a polymer electrolyte fuel cell.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. In the present invention, examples of the reaction layer include a slurry layer in which a catalyst-carrying conductive material and an ion-conductive resin are directly formed on a solid polymer membrane and dispersed in a solvent. Here, the thickness of the reaction layer is preferably 5 to 30 μm. Here, if the thickness of the reaction layer is less than 5 μm, a sufficient amount of catalyst required for a battery reaction cannot be obtained.
In addition, the high molecular weight in the reaction layer is so small that the polymer cannot sufficiently retain water, and the ionic conductivity in the reaction layer decreases. On the other hand, if the thickness exceeds 30 μm, the diffusion resistance of the reaction gas in the reaction layer increases, making it difficult to supply the reaction gas to the entire reaction layer, and difficult to control the water in the reaction layer (in the reaction layer). Water tends to stagnate, which hinders the supply of the reaction gas.)

In the present invention, the slurry layer may be formed, for example, by applying a slurry having the same ion-conductive resin concentration twice or more to the solid polymer membrane, or by applying a slurry having a different ion-conductive resin concentration twice. The above is formed by coating the polymer film. In the former case, it is effective to make the concentration of the ion conductive resin in the reaction layer uniform, and in the latter case, the concentration of the ion conductive resin in the reaction layer is changed from the outside to the boundary between the reaction layer and the solid polymer. This is effective when gradually increasing as one moves toward.

The thickness of the slurry layer is preferably 1 to 50 μm. Here, the thickness of the slurry layer is 1 μm.
When it is less than m, uniform application to the application surface becomes difficult. On the other hand, if the thickness exceeds 50 μm, wrinkles are likely to occur, the reaction layer is likely to be non-uniform, resistance is increased, and power generation efficiency is likely to be reduced.

In the present invention, a method for producing a cell for a polymer electrolyte fuel cell includes a method in which a slurry obtained by mixing a conductive material carrying a catalyst, a polymer material and a solvent is placed on a sheet having good mold release properties. Applying, drying to remove the solvent in the slurry, sandwiching the solid polymer film while applying pressure from both sides in a state where the sheet is outside, and then manufacturing by peeling the sheet, or A slurry obtained by mixing a conductive material carrying a catalyst, a polymer material, and a solvent is directly applied to both surfaces of the solid polymer film, and dried to remove the solvent in the slurry. A method of producing the polymer film by thermocompression bonding is exemplified.

In the method of the present invention, the drying is preferably performed in the air at a temperature of 20 to 100 ° C. Here, when the temperature is lower than 20 ° C., it takes a long time to evaporate and remove the solvent, which causes non-uniformity in the gravitational direction of the reaction layer and increases the cost. On the other hand, if the temperature is 1
If the temperature is higher than 00 ° C., the drying rate is too high, and it becomes difficult to obtain a uniform reaction by agglomeration of the slurry. Preferably, the drying is freeze-drying. This is because the solvent can be removed while maintaining the entangled structure between the conductive material carrying the catalyst and the polymer.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A polymer electrolyte fuel cell (PEFC) cell according to one embodiment of the present invention and a method for manufacturing the same will be described below with reference to the drawings.

Embodiment 1 Referring to FIGS. 3A to 3E. First, a catalyst in which 45% by weight of platinum particles having an average particle diameter of 2 nm were supported on carbon black was used as an electrode catalyst.
Next, this catalyst powder was dispersed in ion-exchanged water and then in ethanol. A perfluorosulfonic acid resin (ion conductive resin) solution (trade name: SE)
−5112, manufactured by Du Pont) to prepare a slurry 31. Subsequently, a Teflon (registered trademark) sheet 32 as a release sheet was disposed so as to protrude from the horizontal plane, and then the slurry 31 was applied to the Teflon sheet 32 at a thickness of 10 μm (see FIG. 3A). .

Next, the applied slurry 31 was dried in a constant-temperature drying oven, the solvent was removed, and a first slurry layer 33a was formed on one surface of the Teflon sheet 32 (see FIG. 3B). Subsequently, a slurry having the same concentration as that of the slurry 31 was applied on the slurry layer 33a to a thickness of 10 μm and dried to form a second slurry layer 33b. Here, the first slurry layer 33a and the second slurry layer 33b are simply referred to simply as a slurry layer 33. Note that the above steps were repeated until the catalyst amount reached a predetermined value. Also, the slurry layer 33
The Teflon sheet 32 on which is formed is called a base material 34 (FIG. 3).
(C)).

Next, a perfluorosulfonic acid resin film (a solid polymer film manufactured by Du Pont, a trade name: trade name) prepared separately so that the slurry layer 33 of the base material 34 is located inside the base material 34. Nafion 112) 35 was sandwiched from both sides, and the base material 34 was thermocompressed from both sides (FIG. 3).
(D)). Thereafter, the Teflon sheet 32 is peeled off, and a PEFC comprising a solid polymer film 35 and a reaction layer 36 is formed.
A cell 37 was manufactured (see FIG. 3E). Here, the thickness of the reaction layer 36 is about 30 μm.

As shown in FIG. 3E, the PEFC cell 37 manufactured as described above includes a solid polymer film 35 and
30 μm thick formed on both sides of this solid polymer film 35
And a reaction layer 36 made of. Such cell 3
According to 7, since the reaction layer 36 is formed by applying the slurry 31 having the same polymer concentration on the Teflon sheet 32 a plurality of times and repeating the drying, the polymer is uniformly dispersed in the reaction layer 36. Distributed. As a result, as shown by the curve (b) in FIG. 6, the polymer is uniformly distributed in the reaction layer. Further, the polymer has a configuration in which the concentration of hydrogen ions is sufficient to move in the reaction layer. Therefore, the ionic conductivity in the reaction layer 36 can be improved.

In fact, when the above cell was sandwiched between two stainless steel-made separators via carbon paper water-repellent with tetrafluoroethylene, a power generation test was carried out. Such characteristics were obtained. However, hydrogen gas was supplied to the anode, and air was supplied to the cathode so that the hydrogen utilization rate was 70% and the air utilization rate was 40%, respectively. Each gas supply unit is provided with a temperature controller and a humidifier, the temperature of the supply gas is basically set to be equal to the battery temperature, and the humidity is such that the dew point temperature of the supply gas is lower than the battery temperature by 15 to 35 ° C. It was set to become.

Example 2 First, carbon black was used.
A catalyst carrying 45% by weight of platinum particles having an average particle size of 2 nm was used as an electrode catalyst. Next, this catalyst powder was dispersed in ion-exchanged water and then in ethanol. A perfluorosulfonic acid resin solution (trade name: SE)
−5112, manufactured by Du Pont) to prepare a slurry 31. At this time, two kinds of slurries A and B were prepared by changing the amount of the catalyst and the weight% of the perfluorosulfonic acid resin solution. However, slurry B is better than slurry A
% Of the perfluorosulfonic acid resin solution is large.
Subsequently, a Teflon sheet 32 as a release sheet was arranged so that its horizontal surface was protruded, and then the slurry was applied to the Teflon sheet at a thickness of 10 μm.

Next, the applied slurry A is dried in a constant-temperature drying oven to remove the solvent, and the first surface of the Teflon sheet is
Was formed. Subsequently, the slurry B was coated on the slurry layer A at a thickness of 10 μm, dried, and dried.
Was formed. Here, the first slurry layer,
The second slurry layer is simply referred to as a slurry layer. Note that the above steps were repeated until the catalyst amount reached a predetermined value. The Teflon sheet on which the slurry layer has been formed is referred to as a substrate.

Next, a separately prepared perfluorosulfonic acid resin film (Nafion 112) was sandwiched between both sides of the base material such that the slurry layer of the base material was located inside, and the base material was thermocompressed from both sides. Thereafter, the Teflon sheet was peeled off, and a PE comprising a solid polymer film and a reaction layer
A cell for FC was manufactured. Here, the thickness of the reaction layer is about 3
0 μm.

According to the PEFC cell manufactured in this manner, two kinds of slurries having different polymer concentrations are placed on a Teflon sheet such that the slurry having a large weight% of the perfluorosulfonic acid resin solution is located outside. And apply
The reaction layer is formed by repeating the drying. As a result, as shown by the line (c) in FIG. 6, the polymer is distributed in the reaction layer so as to gradually increase from the outside toward the boundary between the reaction layer and the solid polymer film. Therefore, the ionic conductivity in the reaction layer can be improved.

In fact, when the above-mentioned cell was sandwiched by a separator made of stainless steel with a carbon paper water-repellent with tetrafluoroethylene interposed therebetween and a power generation test was performed, a curve shown in FIG. Characteristics were obtained. However, hydrogen gas was supplied to the anode, and air was supplied to the cathode so that the hydrogen utilization rate was 70% and the air utilization rate was 40%, respectively. Each gas supply unit is provided with a temperature controller and a humidifier, the temperature of the supply gas is basically set to be equal to the battery temperature, and the humidity is such that the dew point temperature of the supply gas is lower than the battery temperature by 15 to 35 ° C. It was set to become.

(Embodiment 3) Referring to FIGS. 4 (A) to 4 (D). In FIG. 4D, the thickness of the solid polymer film and the thickness of the reaction layer are increased for convenience.

First, carbon black was added with an average particle size of 2n.
A catalyst carrying 45% by weight of platinum particles of m was used as an electrode catalyst. Next, this catalyst powder is dispersed in ion-exchanged water,
Then it was dispersed in ethanol. A perfluorosulfonic acid resin solution (trade name: SE-5112,
Du Pont) was mixed to prepare a slurry 41. Subsequently, a perfluorosulfonic acid resin film (solid polymer film, Nafion 112) 42 was disposed so that a horizontal plane emerged, and the slurry 41 was applied to one surface of the solid polymer film 42 by air spray to a thickness of 1 μm ( FIG.
(A)).

Next, the applied slurry 41 was sufficiently dried in a constant-temperature drying oven to remove the solvent, and a first slurry layer 43 was formed on one side of the Teflon sheet (see FIG. 4B). Subsequently, similarly to the first slurry layer 43,
A second slurry layer 44 was formed on the surface opposite to the solid polymer film 42 (see FIG. 4C). Thereafter, the laminate composed of the solid polymer film 42 and the first and second slurry layers 43 and 44 was hot-pressed to form the solid polymer film 42 and both sides of the solid polymer film 42. PEFC composed of a reaction layer 45 having a thickness of 30 μm
A cell 46 was manufactured (see FIG. 4D).

When a power generation test was performed on the PEFC cell according to Example 3 under the same conditions as in Example 1, the characteristics shown by the curve (c) in FIG. 5 were obtained.

Example 4 First, carbon black was used.
A catalyst carrying 45% by weight of platinum particles having an average particle size of 2 nm was used as an electrode catalyst. Next, this catalyst powder was dispersed in ion-exchanged water and then in ethanol. A perfluorosulfonic acid resin solution (trade name: SE)
−5112, manufactured by Du Pont) to prepare a slurry 41. At this time, two kinds of slurries A and B were prepared by changing the amount of the catalyst and the concentration of the perfluorosulfonic acid resin solution. However, the weight percentage of the perfluorosulfonic acid resin solution of the slurry B is larger than that of the slurry A.

Next, a perfluorosulfonic acid resin film (solid polymer film, Nafion 112) is arranged so that a horizontal plane is formed, and the slurry A is coated on one surface of the solid polymer film.
Was applied by air spray to a thickness of 1 μm. Then,
The applied slurry A was sufficiently dried in a constant-temperature drying oven to remove the solvent, and a 1 μm-thick first slurry layer made of the slurry A was formed on one surface of the solid polymer. Then, first
In the same manner as the slurry A, the second slurry layer of the slurry B having a thickness of 2 μm was formed on the slurry layer of the above.

Next, on the opposite surface of the solid polymer film,
A first slurry layer and a second slurry layer were sequentially formed in the same manner as on one side. Thereafter, a laminate comprising the solid polymer film and the first and second slurry layers on both sides of the solid polymer film is hot-pressed to form the solid polymer film on both sides of the solid polymer film. And a reaction layer having a thickness of 30 μm.

When a power generation test was performed on the PEFC cell according to Example 4 under the same conditions as in Example 1, the characteristics shown by the curve (d) in FIG. 5 were obtained.

In Embodiments 2 and 4, the case where two types of different slurry layers are used has been described. However, the present invention is not limited to this, and three or more types of different slurry layers may be used. However, in this case, a slurry is used in which the weight% of the perfluorosulfonic acid resin solution increases as the material is applied to the outside.

(Comparative Example 1) First, carbon black was
A catalyst carrying 45% by weight of platinum particles having an average particle size of 2 nm was used as an electrode catalyst. Next, this catalyst powder was dispersed in ion-exchanged water and then in ethanol. A slurry was prepared by mixing a perfluorosulfonic acid resin (ion conductive resin) solution (trade name: SE-5112, manufactured by Du Pont) with this dispersion solution. Next, a perfluorosulfonic acid resin membrane (solid polymer membrane, Nafion
112) was arranged so that a horizontal plane emerged, and the slurry was applied to one surface of the solid polymer film so as to have a predetermined catalyst amount.

Next, the applied slurry was sufficiently dried in a constant temperature drying oven to remove the solvent, and a first slurry layer was formed on one side of the Teflon sheet. Subsequently, in the same manner as in the first slurry layer, a second surface is provided on the opposite surface of the solid polymer film.
Was formed. Thereafter, the laminate comprising the solid polymer film and the first and second slurry layers is hot-pressed to form a solid polymer film and reaction layers formed on both sides of the solid polymer film. A cell for PEFC was manufactured.

A power generation test was performed on the PEFC cell according to the comparative example under the same conditions as in Example 1.
The characteristic shown by the line (e) was obtained. Further, in the PEFC cell according to the comparative example, the polymer concentration in the reaction layer gradually decreases from the outside toward the boundary between the reaction layer and the solid polymer film, as shown by the line (a) in FIG. Are distributed as follows. Therefore, as is apparent from FIG. 5, the comparative example has a problem that the voltage drop accompanying the increase in the current density is large as compared with each of Examples 1 to 4.

[0044]

As described above, according to the present invention, the ion-conductive resin is uniformly distributed in the reaction layer, and the ion-conductive resin has a hydrogen ion concentration moving in the reaction layer. By providing a structure having a concentration sufficient for the polymer electrolyte fuel cell, it is possible to provide a cell for a polymer electrolyte fuel cell that can maintain the power generation performance of the cell by making the distribution of the ion conductive resin in the reaction layer uniform.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a PEFC.

FIG. 2 is an explanatory diagram of a cell constituting a conventional PEFC.

FIG. 3 is an explanatory view showing a method of manufacturing a cell for PEFC according to Embodiment 1 of the present invention in the order of steps.

FIG. 4 is an explanatory view showing a method for manufacturing a cell for PEFC according to Embodiment 3 of the present invention in the order of steps.

FIG. 5 is a voltage-current density characteristic diagram of the cells for PEFC according to Examples 1 to 4 and Comparative Example of the present invention.

FIG. 6 is a diagram showing characteristics of a polymer concentration in a reaction layer of a cell for PEFC according to the present invention and a comparative example.

[Explanation of symbols]

 31, 41: slurry, 32: Teflon sheet, 33, 43, 44: slurry layer, 35, 42, 44: solid polymer film, 36, 45: reaction layer, 37, 46: cell for PEFC.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Moriga 4-6-22 Kannonshinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Laboratory F-term (reference) 5H018 AA06 AS02 AS03 BB01 BB03 BB06 BB08 BB12 DD08 DD10 EE03 EE08 EE18 EE19 HH08 5H026 AA06 CC03 CX04 CX05 EE02 EE05 EE19 HH08

Claims (13)

[Claims] 1. In a solid polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched between reaction layers, the ion conductive resin is uniformly distributed in the reaction layer, and the ion conductive resin is A cell for a polymer electrolyte fuel cell, wherein the hydrogen ion concentration has a concentration sufficient to move in the reaction layer. 2. The reaction layer according to claim 1, wherein the catalyst-supporting conductive material and the ion-conductive resin are directly formed on the solid polymer membrane and are dispersed in a solvent. For polymer electrolyte fuel cells. 3. The polymer electrolyte fuel cell according to claim 1, wherein the thickness of the reaction layer is 5 to 30 μm. 4. The solid height according to claim 2, wherein the slurry layer is formed by applying a slurry having the same ion-conductive resin concentration to a solid polymer film twice or more. Cell for molecular fuel cell. 5. The slurry layer has a thickness of 1 to 50 μm.
The polymer electrolyte fuel cell according to any one of claims 1 to 3, wherein: 6. A polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched by a reaction layer, wherein an ion-conductive resin is provided inside the reaction layer at a boundary between the reaction layer and the solid polymer membrane from outside. A cell for a polymer electrolyte fuel cell, wherein the cells are distributed so as to gradually increase as they move. 7. The reaction layer according to claim 1, wherein the reaction layer comprises a catalyst-supporting carbon powder and a slurry layer in which an ion conductive resin is dispersed in a solvent, which is directly applied to the solid polymer membrane. Item 7. A cell for a polymer electrolyte fuel cell according to Item 6. 8. The polymer electrolyte fuel cell according to claim 6, wherein the thickness of the reaction layer is 5 to 30 μm. 9. The solid polymer type according to claim 6, wherein said slurry layer is formed by applying slurries having different concentrations of ion-conductive resin to a polymer film at least twice. Fuel cell. 10. A method for producing a cell for a polymer electrolyte fuel cell in which both sides of a solid polymer membrane are sandwiched by reaction layers, wherein a conductive material carrying a catalyst, a polymer material and a solvent are mixed. A step of applying the slurry on a sheet having good releasability, a step of drying and removing a solvent in the slurry, and holding the solid polymer membrane while applying pressure from both sides with the sheet facing out A method for producing a cell for a polymer electrolyte fuel cell, comprising: a step of removing the sheet. 11. A method for manufacturing a polymer electrolyte fuel cell having both sides of a solid polymer membrane sandwiched between reaction layers, comprising mixing a conductive material carrying a catalyst, a polymer material, and a solvent. A step of directly applying the slurry to both surfaces of the solid polymer film, a step of drying to remove the solvent in the slurry, and a step of thermocompressing the dried slurry and the solid polymer film. Of producing a cell for a polymer electrolyte fuel cell. 12. The drying is performed at 20 to 100 ° C. in the atmosphere.
The method for producing a polymer electrolyte fuel cell according to claim 10, wherein the method is performed in the range of: 13. The method for manufacturing a polymer electrolyte fuel cell according to claim 10, wherein the drying is freeze-drying.