JP6641812B2 - Manufacturing method of membrane electrode assembly - Google Patents

Description

The present invention is a membrane electrode assembly constituting the solid polymer electrolyte fuel cell: about the (MEA membrane-electrode assembly) fabrication how.

  Conventionally, as a method for producing a membrane electrode assembly, an electrode catalyst layer having a desired shape (hereinafter, simply referred to as a “catalyst layer”) is bonded to a solid polymer electrolyte membrane by thermocompression bonding or the like, and then gas leakage is suppressed. A gasket material is formed on the outer periphery of the catalyst layer so as to cover the solid polymer electrolyte membrane. Since the exposed portion of the solid polymer electrolyte membrane having a large dimensional change is reduced by this gasket material, the membrane breakage due to expansion and contraction during power generation can be suppressed.

For example, as shown in Patent Document 1, hot pressing is performed so that a solid polymer electrolyte membrane is sandwiched by a transfer sheet for forming a catalyst layer obtained by applying and drying a catalyst paste on a transfer base material. Thus, an electrolyte membrane-catalyst layer assembly is obtained. Thereafter, a frame-shaped gasket material is joined so as to cover the outer peripheral edge of the catalyst layer.
In the above method, a frame-shaped gasket material rides on the catalyst layer to suppress gas leakage, and therefore, there is a catalyst that does not participate in power generation. Therefore, the utilization efficiency of the expensive catalyst is reduced, and it is difficult to obtain sufficient power generation performance.

Further, in Patent Document 2, after a frame-shaped gasket is bonded to a solid polymer electrolyte membrane, a catalyst layer forming transfer sheet as in Patent Document 1 is hot-pressed, and only the transfer base material is peeled off. A membrane-catalyst layer assembly is obtained.
In the above method, a gasket material is provided in a frame shape, and a catalyst layer is pressed into a concave electrolyte membrane portion, so that a pressure is strongly applied to the frame-shaped gasket portion. This makes it difficult to transfer the catalyst layer uniformly to the electrolyte membrane. In addition, due to the non-uniform transfer, a gap without a catalyst layer is generated in the case of the frame portion, so that an exposed portion of the electrolyte membrane is formed. The exposed portion may be ruptured by power generation.

  In addition, since the catalyst layer also touches the gasket material during hot pressing, it is necessary to join a mask material or perform release treatment with a release agent, etc., so that the catalyst layer is not transferred to the gasket material, and cost is reduced. There is a concern that the performance may decrease due to the release and release of the release agent during power generation.

JP 2009-135068 A JP 2006-244930 A

  An object of the present invention is to provide a method for producing a membrane / electrode assembly having a gasket material, in which a decrease in utilization efficiency of a catalyst is suppressed, and a membrane / electrode assembly having no exposed portion between the catalyst layer and the solid polymer electrolyte membrane. It is an object of the present invention to provide a method that can improve the transferability of the catalyst layer.

A first aspect of the present invention is a method for producing a membrane / electrode assembly comprising: a polymer electrolyte membrane; and an electrode catalyst layer formed in a predetermined planar shape on surfaces opposite to each other of the polymer electrolyte membrane. A method characterized by performing the following step (2) using a transfer film satisfying the following configuration (1).
(1) It has a substrate, a gasket layer bonded on the substrate, a transfer substrate bonded on the gasket layer, and an electrode catalyst layer formed on the transfer substrate. The gasket layer has a cut line corresponding to the outline of the planar shape up to a boundary position with the substrate. The electrode catalyst layer and the transfer substrate have an outer surface that matches the cut line, and are present on the gasket layer in a shape that matches the planar shape.

(2) the towards the surface of the electrode catalyst layer and the gasket layer pre-Symbol polymer electrolyte membrane of the transfer film, the said gasket layer frame-like existing outside from the electrode catalyst layer and the score line After thermocompression bonding to the surface, the transfer base material is peeled off from the electrode catalyst layer, and the frame-shaped gasket layer existing outside the cut line is peeled off from the substrate, so that the polymer is removed from the transfer film. The planar electrode catalyst layer and the frame-shaped gasket layer are transferred to the surface of the electrolyte membrane. Thereby, the planar electrode catalyst layer and the frame-shaped gasket layer are formed on the surface of the polymer electrolyte membrane.

  A second aspect of the present invention is a membrane electrode assembly having a polymer electrolyte membrane and an electrode catalyst layer formed in a predetermined planar shape on surfaces opposite to each other of the polymer electrolyte membrane, Outside the electrode catalyst layer on the surface of the polymer electrolyte membrane, a frame-shaped gasket layer having an inner surface (inner surface, inner peripheral surface) corresponding to the outer shape of the planar shape is formed. A membrane electrode assembly in which the outer surface (outer surface, outer surface) of the catalyst layer and the inner surface of the gasket layer are in contact. That is, in the membrane-electrode assembly according to the second aspect, the electrode catalyst layer and the gasket layer are in contact with each other at a plane that matches the outline of the planar shape.

  According to the method for producing a membrane / electrode assembly of the present invention, as a membrane / electrode assembly having a gasket material, a decrease in catalyst utilization efficiency is suppressed, and there is no exposed portion between the catalyst layer and the solid polymer electrolyte membrane. Thus, the transferability of the catalyst layer can be improved.

It is a schematic diagram of a manufacturing method of a membrane electrode assembly corresponding to one embodiment of the present invention. It is the schematic of the manufacturing method of the membrane electrode assembly corresponding to the comparative example of this invention.

The method according to the first aspect may include a step of manufacturing the transfer film by using a laminate having the following configuration (a) and performing the following step (b).
(a) It has a substrate, a gasket layer bonded on the substrate, a transfer substrate bonded on the gasket layer, and an electrode catalyst layer formed on the transfer substrate. The planar shape of the substrate, the gasket layer, the transfer substrate, and the electrode catalyst layer is larger than the planar shape of the electrode catalyst layer formed on the membrane electrode assembly.

(b) From the side of the electrode catalyst layer of the laminate to the boundary position of the gasket layer with the substrate, the gasket layer was cut with a cut line corresponding to the outline of the planar shape of the electrode catalyst layer formed on the membrane electrode assembly. Thereafter, the transfer substrate outside the cut line is peeled from the gasket layer. Thereby, the transfer base material and the electrode catalyst layer outside the cut line are removed from the laminate.

The production of the laminate can be performed by a method including a step of bonding the gasket layer to the transfer substrate on which the electrode catalyst layer is formed. The bonding between the substrate and the gasket layer may be performed before or after the formation of the electrode catalyst layer.
The production of the laminate can be performed by a method including a step of forming the electrode catalyst layer on the transfer substrate to which the gasket layer is bonded. The bonding between the substrate and the gasket layer may be performed before or after the formation of the electrode catalyst layer.

According to the method for manufacturing a membrane electrode assembly of the first embodiment and the membrane electrode assembly of the second embodiment, since there is no portion where the solid polymer electrolyte membrane is exposed, it is possible to suppress gas leakage and rupture of membrane due to dimensional change. it can.
Furthermore, in the case where the transfer film is manufactured by performing the step (b) using the laminate having the configuration (a), by performing cutting by punching or the like, defects after removing the transfer base material, Since there is no portion where the gasket material rides on the catalyst layer and the efficiency of use of the catalyst is not reduced, high performance can be exhibited.

  According to the method for producing a membrane electrode assembly of the first aspect, the catalyst layer and the gasket material are simultaneously processed into a desired shape in advance, and the shape of the opening of the gasket material and the shape of the catalyst layer are made the same. High stability and high performance by joining a gasket material to suppress gas leakage, with no exposed part between the polymer electrolyte membrane and the solid electrolyte membrane Can be manufactured. In addition, by transferring the shape of the catalyst layer in advance so that the pressure can be selectively applied to the catalyst layer at the time of applying heat and pressure, the transferability can be improved.

Next, an embodiment of the present invention will be described. Note 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. Are also included in the scope of the present invention.
FIG. 1 is a schematic diagram for explaining a method for manufacturing a membrane electrode assembly corresponding to an embodiment of the present invention.

  In this method, first, the catalyst ink 3 is applied onto the transfer base material 10 (a) and then dried to form the electrode catalyst layer 50 (b). A gasket material (gasket layer) 1 having an adhesive layer is attached to the transfer substrate 10 via the adhesive layer. Further, on the back surface of the gasket material 1, a plastic film (substrate) 2 having an adhesive layer is bonded via an adhesive layer to form a gasket substrate 12 (c). Thereby, a laminated body is obtained. That is, (a) to (c) are the manufacturing steps of the laminate.

The gasket substrate 12 may be obtained by previously bonding the gasket material 1 and the plastic film 2 having an adhesive layer.
Next, the electrode catalyst layer 50, the transfer substrate 10, and the gasket material 1 are cut from the top of the electrode catalyst layer 50 of the laminate using a blade or the like so as to have cuts of the same shape (d). Next, the outer peripheral portions of the cut portions of the electrode catalyst layer 50 and the transfer substrate 10 are removed from the gasket material 1 to obtain a transfer film 11 having a convex shape (e).

  After the transfer films 11 were obtained in the same manner using the anode catalyst ink and the cathode catalyst ink, the anode and cathode transfer films 11 were arranged so as to be mirror images with the solid polymer electrolyte membrane 4 interposed therebetween, and then heated. Press (f). After the heat pressing, the transfer substrate 10a was removed from the electrode catalyst layer 50a of the transfer film 11, and the plastic film 2 having the adhesive layer was removed from the frame-shaped gasket material 1a in contact with the solid polymer electrolyte membrane 4 (g). A membrane electrode assembly 5 is obtained (h).

  The solid polymer electrolyte membrane 4 is a polymer material exhibiting good proton conductivity in a wet state. The transfer substrate 10 is a plastic film. Further, the gasket material 1 and the plastic film 2 having an adhesive layer are films having an adhesive layer. The catalyst ink 3 is formed of powdered carbon and resin carrying a catalyst made of platinum or an alloy of platinum and another metal, and forms the electrode catalyst layer 50 by drying and solidification.

Hereinafter, specific examples of materials constituting the solid polymer electrolyte membrane 4, the electrode catalyst layer 50, the transfer substrate 10, the gasket material 1, and the plastic film 2 having an adhesive layer will be described, but the present invention is not limited thereto.
As a polymer material constituting the solid polymer electrolyte membrane 4, specifically, a hydrocarbon polymer electrolyte or a fluorine polymer electrolyte can be used. As the hydrocarbon-based polymer electrolyte membrane, an electrolyte membrane such as sulfonated polyetherketone, sulfonated polyethersulfone, sulfonated polyetherethersulfone, sulfonated polysulfide, and sulfonated polyphenylene can be used.

  As the fluorine-based polymer electrolyte, for example, Nafion (registered trademark) manufactured by DuPont, Flemion (registered trademark) manufactured by Asahi Glass, Aciplex (registered trademark) manufactured by Asahi Kasei, or Gore Select (registered trademark) manufactured by Gore can be used. The hydrocarbon-based electrolyte membrane is less likely to permeate and swell into a solvent as compared with a fluorine-based polymer electrolyte, and is therefore more preferably applied with a catalyst ink on a solid electrolyte membrane. The thickness of the solid polymer electrolyte membrane 4 is formed to be about 5 μm or more and 300 μm or less.

As the resin constituting the electrode catalyst layer 50, the same resin as the above-mentioned polymer material can be used.
Examples of the catalyst constituting the electrode catalyst layer 50 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, and gallium. , A metal such as aluminum, platinum and an alloy thereof, or an oxide or a double oxide thereof can be used. Among them, platinum and a platinum alloy are more preferable.

  When the particle size of the catalyst is too large, the activity of the catalyst is reduced. When the particle size is too small, the stability of the catalyst is reduced. The powdered carbon constituting the electrode catalyst layer 50 is not particularly limited as long as it has a fine particle shape and conductivity and does not attack the catalyst. Specifically, carbon black, graphite, graphite, activated carbon, carbon fiber, carbon nanotube, fullerene, or the like can be used. The particle size of the powdered carbon is preferably about 10 nm to 100 nm smaller than that of the catalyst.

The electrode catalyst layer 50 can be obtained by applying the catalyst ink 3 prepared by dispersing the above-mentioned material in a solvent and water on the transfer substrate 10 and drying the ink. As the solvent, alcohols such as 1-propanol and 2-propanol may be used to suitably disperse the material, but a solvent having a boiling point lower than that of water is more preferable because it is easy to dry.
As a material constituting the transfer base material 10, if the electrode catalyst layer 50 can be formed on the surface thereof, the formed electrode catalyst layer 50 can be transferred to the solid polymer electrolyte membrane 4, and can be removed from the adhesive layer of the gasket material 1, There is no particular limitation. The following materials can be exemplified as the material constituting the transfer substrate 10.

Polymer films such as polyimide, polyethylene terephthalate, polypalvanic acid aramid, polyamide (nylon), polysulfone, polyethersulfone, polyethersulfone, polyphenylene sulfide, polyetheretherketone, polyetherimide, polyacrylate, and polyethylenenaphthalate.
Further, heat-resistant fluororesins such as ethylene tetrafluoroethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroperfluoroalkylvinyl ether copolymer, and polytetrafluoroethylene can also be used.

The coating device for forming the electrode catalyst layer 50 on the transfer substrate 10 may be a device capable of coating the catalyst layer with a uniform thickness, and a method such as a die coater method or a roll coater method can be used.
The substrate layer of the plastic film 2 having the gasket material 1 and the adhesive layer is not particularly limited as long as it has heat resistance that does not melt when heated and pressed, and the following materials can be exemplified. Polymer films such as polyethylene naphthalate, polyethylene terephthalate, polyimide, polypalvanic acid aramid, polyamide (nylon), polysulfone, polyethersulfone, polyethersulfone, polyphenylene sulfide, polyetheretherketone, polyetherimide, and polyacrylate.

  Further, heat-resistant fluororesins such as ethylene tetrafluoroethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroperfluoroalkylvinyl ether copolymer, and polytetrafluoroethylene can also be used. In consideration of gas barrier properties and heat resistance, the substrate of the gasket material 1 is particularly preferably polyethylene naphthalate.

The gasket material 1 and the pressure-sensitive adhesive layer of the plastic film 2 having a pressure-sensitive adhesive layer may be any pressure-sensitive adhesive such as acrylic, urethane, silicone, or rubber. Considering the heat resistance at the time of hot pressurization, it is more preferable to use an acrylic resin.
The adhesiveness of the gasket material 1 and the adhesive layer of the plastic film 2 having the adhesive layer is determined as follows: “Adhesion between the solid polymer electrolyte membrane 4 and the gasket material 1”> “between the gasket material and the plastic film 2 having the adhesive layer” Adhesion "is preferable because it is easy to join the gasket material 1 to the membrane electrode assembly 5.

  The electrode catalyst layer 50 having a notch with an excellent shape and size can be obtained by performing a process using a blade tool such as a punching process for forming the notch in the transfer film 11. At this time, it is necessary to penetrate the blade mold to the electrode catalyst layer 50, the transfer base material 10, and the gasket material 1 and cut it. Thus, by simultaneously cutting the electrode catalyst layer 50 and the gasket material 1 into the same shape, it is possible to eliminate a gap between the electrode catalyst layer 50 of the membrane electrode assembly 5 and the gasket material 1.

At this time, if the cutting is performed to the plastic film 2 having the adhesive layer, the electrode catalyst layer 50 may fall off from the transfer film 11, and a positional shift occurs between the gasket material 1 and the catalyst layer 50. Resulting in. A gap or a riding portion is generated due to the displacement, and an exposed portion of the polymer electrolyte membrane is generated in the membrane electrode assembly 5, which is not preferable.
Further, when a method of peeling off the mask material is employed without cutting as in the present invention, the cross-sectional shape may be broken and the adhesion may be impaired, or partial peeling may occur to cause a problem during power generation. .

Since the heating temperature in the thermal pressurization is near the softening point of the polymer material contained in the electrode catalyst layer 50 and the solid polymer electrolyte membrane 4, the heating temperature may be 70 to 200 ° C. The hot pressing method may be a flat plate or a roll.
In the method of manufacturing a membrane electrode assembly, all steps are preferably continuous in consideration of manufacturing efficiency, but all steps may be discontinuous in consideration of the yield of the application step of the electrode catalyst layer 50.

According to the method for manufacturing a membrane electrode assembly described above, there is no exposed portion of the electrolyte membrane 4 between the electrode catalyst layer 50 on the solid polymer electrolyte membrane 4 and the gasket material 1 on the outer peripheral portion of the electrode catalyst layer 50. In addition to the fact that the performance does not deteriorate due to gas leaks and dimensional changes, there is no portion where the gasket material 1 rides on the catalyst layer. Can be provided.
Hereinafter, examples of the present invention and comparative examples will be specifically described. However, the present invention is not limited to the following examples.

<Production of membrane electrode assembly>
[Example]
A fluororesin film (FLUON Aflex 50N (NT) manufactured by Asahi Glass, thickness 50 μm) was prepared as the transfer substrate 10.
A fluoropolymer electrolyte membrane dispersion solution (SS700C / 20 manufactured by Asahi Kasei E-Materials), a platinum catalyst (TEC “10F30E-HT” manufactured by Tanaka Kikinzoku), 1-propanol were placed on the transfer substrate 10 by a die coater method. And a catalyst ink 3 composed of water was applied by a die coater. Next, the anode electrode catalyst layer 50 was formed on the transfer substrate 10 by drying at a temperature of 90 ° C. for 10 minutes. The anode electrode catalyst layer 50 was formed in the center of the transfer substrate 10 in a square plane shape of about 8 cm × 8 cm. Thus, the state shown in FIG. 1B was obtained.

Further, the cathode electrode catalyst layer 50 was formed on the transfer base material 10 in the same manner as described above except that the platinum catalyst (TEC “10F50E-HT” manufactured by Tanaka Kikinzoku) was changed.
The gasket material 1 was prepared from a polyethylene naphthalate film (Teonex Q51 manufactured by Teijin DuPont Films, thickness 25 μm), on one surface of which an acrylic adhesive layer (thickness 10 μm) was formed. As the substrate 2, a plastic film (Prosave25CBFS2 manufactured by Kimoto, thickness 27.5 μm) having an acrylic adhesive layer on polyethylene terephthalate was prepared. The gasket substrate 12 was prepared by previously attaching the back surface of the gasket material 1 (the surface without the adhesive layer) to the adhesive layer of the substrate 2.

The gasket substrate 12 is attached to the back surface (the surface without the electrode catalyst layer 50) of each transfer substrate 10 on which the anode catalyst layer and the cathode electrode catalyst layer 50 are formed, and the state shown in FIG. Was obtained. In this state, an adhesive layer exists between the transfer substrate 10 and the gasket material 1, and an adhesive layer also exists between the gasket substrate 1 and the substrate 2.
Next, for the laminate shown in FIG. 1 (c), a 5 cm × 5 cm square tool is pressed from the electrode catalyst layer 50 to the trouble of the substrate 2 to perform punching. The material 10 and the gasket material 1 were cut. The punching process was performed by adjusting the pushing amount of the blade mold so that the gasket material 1 was cut and the substrate 2 was not cut. Thus, the state shown in FIG.

Next, the portion outside the cut line between the electrode catalyst layer 50 and the transfer base material 10 is removed between the transfer base material 10 and the gasket material 1 so that the adhesive layer remains on the gasket material 1. A transfer film 11 for a cathode was obtained. That is, the state shown in FIG.
As shown in FIG. 1 (e), the gasket layer 1 of the transfer film 11 obtained has a cut line 13 that matches the outline of the planar shape of the electrode catalyst layer formed on the membrane / electrode assembly 5 and the substrate 2. To the boundary position of. The electrode catalyst layer 50a and the transfer substrate 10a of the transfer film 11 have outer surfaces that match the cut lines 13.

The obtained transfer film for anode 11 and transfer film for cathode 11 are aligned with the front surface and the back surface (one surface and the other surface opposite to each other) of the solid polymer electrolyte membrane 4 made of a hydrocarbon film (thickness 11 μm). The plate was hot-pressed at a pressure of 0.8 MPa and a temperature of 170 ° C. for 10 minutes. That is, the step shown in FIG.
As a result, a 5 cm × 5 cm square anode electrode catalyst layer 50 a is joined to the center of one surface of the solid polymer electrolyte membrane 4, and a 5 cm × 5 cm square formed by cut lines is formed outside the anode electrode catalyst layer 50 a. The frame-shaped gasket material 1a having a square inner surface was joined. A 5 cm × 5 cm square cathode electrode catalyst layer 50 a is joined to the center of the other surface of the solid polymer electrolyte membrane 4, and a 5 cm × 5 cm 5 cm × 5 cm formed by a cut line is formed outside the cathode electrode catalyst layer 50 a. The frame-shaped gasket material 1a having a square inner surface was joined.

  Next, as shown in FIG. 1 (g), the transfer substrate 10a was peeled off from each electrode catalyst layer 50a, and the substrate 2 was peeled off from each frame-shaped gasket material 1a. The adhesive layer of the substrate 2 was left on the substrate 2 side. As a result, a membrane-electrode assembly in which a square catalyst layer (anode catalyst layer, cathode catalyst layer) 50a and a frame-shaped gasket material 1a are formed on opposite surfaces of the solid polymer electrolyte membrane 4 5 was obtained. The electrode catalyst layer 50a is disposed at the center of the solid polymer electrolyte membrane 4, the frame-shaped gasket material 1a is disposed around the electrode catalyst layer 50a, and the outer surface of the electrode catalyst layer 50a and the inner surface of the gasket material 1a In contact.

[Comparative example]
FIG. 2 shows, as a comparative example, a method for manufacturing a membrane / electrode assembly using the same material as in the example in the same manner as in Patent Document 2. In the same manner as in the example, the anode and cathode catalyst inks 3 were applied and dried on the fluorine-based resin film used as the transfer substrate 10 to form the electrode catalyst layers 50 (a) and (b).

Next, after previously forming a frame-shaped gasket material 1 having a 5 cm × 5 cm square opening by punching, the gasket material 1 is placed on the opposite surfaces of the solid polymer electrolyte membrane 4. The openings are arranged so that the positions of the openings coincide with each other on the front and back of the solid polymer electrolyte membrane 4, and are bonded via an adhesive layer (c).
The electrode catalyst layer 50 obtained in (b) was placed on the surface of the gasket material 1 in (c), and a flat plate was hot-pressed at a pressure of 0.8 MPa and a temperature of 170 ° C. for 10 minutes (d). Thereafter, as shown in (e), the transfer substrate was removed, and a membrane electrode assembly 5 having a catalyst layer bonded to both surfaces was obtained.

<Evaluation of membrane electrode assembly>
With respect to the membrane electrode assemblies of Examples and Comparative Examples obtained in this manner, the presence / absence of a portion where the gasket material runs onto the catalyst layer, the presence / absence of transfer failure of the catalyst layer, the presence / absence of an exposed portion of the electrolyte membrane, the presence of unnecessary catalyst The transfer of the layer and the appearance of the membrane electrode assembly were evaluated. Table 1 shows the results.

  As shown in Table 1, in the membrane / electrode assembly obtained by the method of the example and the comparative example, the gasket material did not run over the catalyst layer. Further, in the example, transfer failure of the catalyst layer did not occur. However, in the comparative example, since transfer to the electrolyte membrane depressed by the frame-shaped gasket material had to be performed, pressure was not sufficiently applied to the electrolyte membrane portion, and transfer failure occurred partially near the electrolyte membrane. In addition, only in the comparative example, exposed portions of the solid polymer electrolyte membrane were formed due to poor transfer.

Further, in the example, the catalyst layer was transferred in a desired shape. In the comparative example, however, as shown in FIG. 2 (a), a gap between the catalyst layer and the solid polymer electrolyte membrane was generated. (F) Cross leak occurs due to the presence of a gap between the gasket material and the catalyst layer as shown in (b), and partial transfer of the catalyst layer onto the gasket material is seen as shown in FIG. 2 (f) c. Was.
Furthermore, although the membrane electrode assembly obtained in the example had a good appearance without wrinkles or distortion, the gasket material was preferentially subjected to strong heat and pressure in the comparative example, resulting in poor appearance due to wrinkles. Had occurred.

1 Gasket material (gasket layer)
1a Frame-shaped gasket material (frame-shaped gasket layer)
2 Plastic film (substrate)
3 Catalyst ink 4 Solid polymer electrolyte membrane (polymer electrolyte membrane)
Reference Signs List 5 membrane electrode assembly 10 transfer base material 10a transfer base material of transfer film 11 transfer film 12 gasket substrate 13 cut line 50 electrode catalyst layer 50a electrode catalyst layer of transfer film

Claims (4)

A method for producing a membrane electrode assembly, comprising: a polymer electrolyte membrane, and an electrode catalyst layer formed in a predetermined planar shape on surfaces opposite to each other of the polymer electrolyte membrane,
A substrate, a gasket layer bonded on the substrate, a transfer base material bonded on the gasket layer, and an electrode catalyst layer formed on the transfer base material, the gasket layer, The electrode catalyst layer and the transfer base material have a cut line corresponding to the outline of the plane shape up to a boundary position with the substrate, and the electrode catalyst layer and the transfer base material have an outline surface matching the cut line, and match the plane shape. Using a transfer film present on the gasket layer in a shape to
Wherein toward the surface of the electrode catalyst layer and the gasket layer pre-Symbol polymer electrolyte membrane of the transfer film, heat the gasket layer frame-like existing outside from the electrode catalyst layer and the score lines on the surface After crimping,
By peeling the transfer substrate from the electrode catalyst layer, by peeling the frame-shaped gasket layer present outside the cut line from the substrate,
A method for producing a membrane / electrode assembly, wherein the planar electrode catalyst layer and the frame-shaped gasket layer are transferred from the transfer film to the surface of the polymer electrolyte membrane. The transfer film,
A substrate, a gasket layer bonded on the substrate, a transfer substrate bonded on the gasket layer, and an electrode catalyst layer formed on the transfer substrate, the substrate, the gasket Layer, the transfer substrate, and a planar shape of the electrode catalyst layer, using a laminate larger than the planar shape of the electrode catalyst layer formed in the membrane electrode assembly,
From the electrode catalyst layer side of the laminate to the boundary position between the gasket layer and the substrate, after cutting at a cut line corresponding to the outline of the planar shape of the electrode catalyst layer formed in the membrane electrode assembly, The method for producing a membrane / electrode assembly according to claim 1, further comprising a step of producing the transfer substrate by peeling the transfer substrate outside the cut line from the gasket layer.   The method for producing a membrane / electrode assembly according to claim 2, wherein the production of the laminate is performed by a method including a step of joining the gasket layer to the transfer substrate on which the electrode catalyst layer is formed.   The method for producing a membrane electrode assembly according to claim 2, wherein the production of the laminate is performed by a method including a step of forming the electrode catalyst layer on the transfer substrate to which the gasket layer is bonded.

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