JP5615794B2 - Manufacturing method of electrolyte membrane / electrode structure for fuel cell - Google Patents

Description

In the present invention, an electrode catalyst layer and a gas diffusion layer are provided on both sides of a solid polymer electrolyte membrane, respectively, and an outer peripheral end portion of the electrode catalyst layer is an outer peripheral end portion of the solid polymer electrolyte membrane and the gas diffusion layer. The present invention relates to a method of manufacturing an electrolyte membrane / electrode structure for a fuel cell that is disposed inward from the outer peripheral end of a layer.

  In general, a polymer electrolyte fuel cell employs a polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell comprises an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode each comprising a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon) are disposed on both sides of a solid polymer electrolyte membrane ( MEA) is sandwiched between separators (bipolar plates). A predetermined number of fuel cells are stacked to form a fuel cell stack, and the fuel cell is used as, for example, an in-vehicle fuel cell stack.

  In this type of electrolyte membrane / electrode structure, for example, in order to prevent a short circuit between the end of the electrode catalyst layer constituting the anode electrode and the end of the electrode catalyst layer constituting the cathode electrode, a solid polymer electrolyte membrane is used. The structure which makes the outer peripheral edge part protrude outward from the outer peripheral edge part of each electrode catalyst layer is employ | adopted. At that time, the solid polymer electrolyte membrane has a thin film shape, and when the outer peripheral edge of the solid polymer electrolyte membrane protrudes outward from the outer peripheral ends of the anode electrode and the cathode electrode, Strength may be reduced.

  Therefore, each gas diffusion layer constituting the anode electrode and the cathode electrode is set to have a larger outer dimension than each electrode catalyst layer, and the outer peripheral edge portion of the solid polymer electrolyte membrane is sandwiched between the outer peripheral edge portions of the gas diffusion layer. The structure to do is known.

  For example, as shown in FIG. 9, a membrane electrode structure disclosed in Patent Document 1 includes a solid polymer electrolyte membrane 1, a catalyst layer 2 on the air electrode side and a fuel sandwiching the solid polymer electrolyte membrane 1 A pole-side catalyst layer 3 is disposed. Adhesive layers 4 and 4 are formed on the outer periphery of the catalyst layers 2 and 3, and gas diffusion layers 5 and 5 are disposed with the catalyst layers 2 and 3 and the adhesive layers 4 and 4 interposed therebetween. Yes. The solid polymer electrolyte membrane 1, the adhesive layers 4, 4 and the gas diffusion layers 5, 5 are laminated with their outer peripheral end faces coinciding with each other.

JP 2010-205484 A

  By the way, normally, the porous base material by carbon fiber is used for the gas diffusion layer as a base material for gas diffusion layers. For this reason, the uneven | corrugated site | part by a carbon fiber exists in the surface of a gas diffusion layer.

  Accordingly, when an adhesive is applied to the gas diffusion layer, the adhesive may soak into the gas diffusion layer, and the uneven portion of the gas diffusion layer may be pushed directly into the solid polymer electrolyte membrane. As a result, the solid polymer electrolyte membrane has a problem that a region where the film thickness is locally reduced occurs or the toughness is lowered.

The present invention solves this type of problem, and the solid polymer electrolyte membrane is not damaged by the fibers of the gas diffusion layer, and the gas diffusion layer and the solid polymer electrolyte membrane are firmly bonded. It is an object of the present invention to provide a method for producing an electrolyte membrane / electrode structure for a fuel cell that can be used.

In the present invention, an electrode catalyst layer and a gas diffusion layer are provided on both sides of a solid polymer electrolyte membrane, respectively, and an outer peripheral end portion of the electrode catalyst layer is an outer peripheral end portion of the solid polymer electrolyte membrane and the gas diffusion layer. The present invention relates to a method of manufacturing an electrolyte membrane / electrode structure for a fuel cell that is disposed inward from the outer peripheral edge of the layer.

The method for manufacturing a fuel cell membrane electrode assembly of this, extends outwardly from the outer edge of the electrode catalyst layer, the outer peripheral edge of the gas diffusion layer which is joined to the outer peripheral edge portion of the solid polymer electrolyte membrane Forming a first adhesive layer by applying a first adhesive to the portion; and after the first adhesive is cured, a second adhesive having a lower viscosity than the first adhesive is applied to the first adhesive layer Forming a second adhesive layer by applying an agent, and bonding the outer peripheral edge of the solid polymer electrolyte membrane and the outer peripheral edge of the gas diffusion layer by the second adhesive layer. ing.

  According to the present invention, since the first adhesive provided on the gas diffusion layer side has a higher viscosity than the second adhesive provided on the solid polymer electrolyte membrane side, it is difficult to soak into the gas diffusion layer. The first adhesive remains on the surface of the gas diffusion layer. Further, when the second adhesive is applied onto the first adhesive, the second adhesive having a low viscosity is prevented from penetrating into the gas diffusion layer by the first adhesive layer, and the first adhesive layer A second adhesive layer having a predetermined thickness can be formed thereon.

  Therefore, since the uneven portion on the surface of the gas diffusion layer is surely covered by the first adhesive layer and the second adhesive layer, the solid state when the gas diffusion layer and the solid polymer electrolyte membrane are bonded (adhered). Local biting into the polymer electrolyte membrane is effectively reduced. Thereby, damage to the solid polymer electrolyte membrane is suppressed as much as possible.

  Furthermore, since the second adhesive has a low viscosity, it is possible to ensure good adhesiveness. Moreover, the second adhesive can fill the smear of the first adhesive and can maintain flatness. For this reason, the adhesive strength with the solid polymer electrolyte membrane is improved, and the gas diffusion layer and the solid polymer electrolyte membrane can be firmly bonded.

1 is an exploded perspective view of a main part of a polymer electrolyte fuel cell in which an electrolyte membrane / electrode structure for a fuel cell according to an embodiment of the present invention is incorporated. FIG. 2 is a sectional view of the fuel cell taken along line II-II in FIG. 1. FIG. 4 is an exploded perspective view of a main part of the electrolyte membrane / electrode structure. It is explanatory drawing of the method of providing an electrode catalyst layer in the solid polymer electrolyte membrane which comprises the said electrolyte membrane and electrode structure. It is explanatory drawing of the manufacturing method by the side of the gas diffusion layer of the anode electrode which comprises the said electrolyte membrane electrode structure. It is explanatory drawing of the manufacturing method by the side of the gas diffusion layer of the cathode electrode which comprises the said electrolyte membrane electrode structure. It is explanatory drawing at the time of adhere | attaching the said gas diffusion layer on both surfaces of the said solid polymer electrolyte membrane. It is a principal part expansion explanatory view of the gas diffusion layer of the anode electrode. It is explanatory drawing of the membrane electrode structure disclosed by patent document 1. FIG.

  As shown in FIGS. 1 and 2, an electrolyte membrane / electrode structure 10 for a fuel cell according to an embodiment of the present invention is incorporated in a polymer electrolyte fuel cell 12, and a plurality of the fuel cells 12 are indicated by an arrow A. The fuel cell stack 13 is configured by being stacked in the direction.

  In the fuel cell 12, the electrolyte membrane / electrode structure 10 is sandwiched between the first separator 14 and the second separator 16. The first separator 14 and the second separator 16 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, a metal plate whose surface is subjected to anticorrosion treatment, a carbon member, or the like. .

  As shown in FIG. 2, the electrolyte membrane / electrode structure 10 includes, for example, a solid polymer electrolyte membrane 18 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode electrode sandwiching the solid polymer electrolyte membrane 18 20 and a cathode electrode 22. The solid polymer electrolyte membrane 18 uses an HC (hydrocarbon) electrolyte in addition to a fluorine electrolyte. The anode electrode 20 is provided on one surface 18 a of the solid polymer electrolyte membrane 18, while the cathode electrode 22 is provided on the other surface 18 b of the solid polymer electrolyte membrane 18.

  The anode electrode 20 includes an electrode catalyst layer 23a joined to the surface 18a of the solid polymer electrolyte membrane 18, and a gas diffusion layer (porous diffusion layer) 26a laminated on the electrode catalyst layer 23a via a base layer 24a. Is provided. The cathode electrode 22 is provided with an electrode catalyst layer 23b joined to the surface 18b of the solid polymer electrolyte membrane 18, and a gas diffusion layer 26b laminated on the electrode catalyst layer 23b via a base layer 24b.

  The electrode catalyst layer 23 a constituting the anode electrode 20 is set to have the same outer dimension (surface area) as that of the base layer 24 a and has an outer dimension smaller than that of the solid polymer electrolyte membrane 18. The electrode catalyst layer 23b constituting the cathode electrode 22 is set to have the same surface area as that of the base layer 24b and has an outer dimension smaller than that of the solid polymer electrolyte membrane 18. The electrode catalyst layer 23a and the foundation layer 24a are set to have smaller outer dimensions than the electrode catalyst layer 23b and the foundation layer 24b. The electrode catalyst layer 23a and the base layer 24a may be set to have larger outer dimensions than the electrode catalyst layer 23b and the base layer 24b, or may be set to the same outer dimensions.

  The solid polymer electrolyte membrane 18 includes an outer peripheral edge portion 18ae extending outward from the outer peripheral ends of the electrode catalyst layer 23a and the underlayer 24a on the surface 18a side, and an electrode catalyst layer 23b and an underlayer 24b on the surface 18b side. And an outer peripheral edge portion 18be extending outward from the outer peripheral end portion.

  While an adhesive layer 28 is provided between the outer peripheral edge 18ae of the solid polymer electrolyte membrane 18 and the outer peripheral edge of the gas diffusion layer 26a, the outer peripheral edge 18be of the solid polymer electrolyte membrane 18 and the gas diffusion layer 26b An adhesive layer 29 is provided between the outer peripheral edge portion. As shown in FIGS. 1 and 3, the adhesive layers 28 and 29 are formed in a frame shape over the entire periphery of the outer peripheral edge portions 18 ae and 18 be of the solid polymer electrolyte membrane 18.

  The electrode catalyst layers 23a and 23b form catalyst particles in which platinum particles are supported on carbon black, use a polymer electrolyte as an ion conductive binder, and uniformly mix the catalyst particles in a solution of the polymer electrolyte. The catalyst paste produced in this way is configured by printing, coating or transferring on both surfaces 18a and 18b of the solid polymer electrolyte membrane 18.

  Underlayers 24a and 24b are formed by pasting carbon black, FEP (tetrafluoroethylene-hexafluoropropylene copolymer) particles, and carbon nanotubes, and then applied to gas diffusion layers 26a and 26b. The gas diffusion layers 26a and 26b are made of carbon paper or the like.

  The adhesive layer 28 includes a first adhesive layer 28a provided on the gas diffusion layer 26a side, and a second adhesive layer 28b provided on the solid polymer electrolyte membrane 18 side and in contact with the first adhesive layer 28a. The first adhesive layer 28a is a layer obtained by curing a first adhesive having a higher viscosity than the second adhesive of the second adhesive layer 28b. A 1st adhesive agent and a 2nd adhesive agent are each used, adjusting a viscosity, for example using a liquid fluoroelastomer. The viscosity of the first adhesive is adjusted to 2 to 80 Pa · s, and the viscosity of the second adhesive is adjusted to 100 to 1000 Pa · s. Specifically, it is carried out by adjusting the degree of polymerization of the elastomer.

  The adhesive layer 29 includes a first adhesive layer 29a provided on the gas diffusion layer 26b side and a second adhesive layer 29b provided on the solid polymer electrolyte membrane 18 side. The first adhesive layer 29a is a layer obtained by curing the first adhesive having a higher viscosity than the second adhesive of the second adhesive layer 29b. A 1st adhesive agent and a 2nd adhesive agent are each used, adjusting a viscosity, for example using a liquid fluoroelastomer.

  In the adhesive layers 28 and 29, for example, an epoxy adhesive, an olefin adhesive, an acrylic adhesive or a urethane adhesive, or a silicone adhesive is used instead of the liquid fluoroelastomer as each of the first adhesive and the second adhesive. An agent or the like can be used. In that case, it is preferable to use the same kind of material for the first adhesive and the second adhesive.

  As shown in FIGS. 2 and 3, the adhesive layer 28 is provided in a frame shape around the base layer 24a around the outer peripheral edge of the gas diffusion layer 26a. Similarly, the adhesive layer 29 is provided in a frame shape around the base layer 24b around the outer peripheral edge of the gas diffusion layer 26b. In addition, it is preferable to perform the sealing process for preventing the leakage of fuel gas or oxidant gas on the outer peripheral end portions of the adhesive layers 28 and 29.

  As shown in FIG. 1, one end edge of the fuel cell 12 in the arrow B direction (horizontal direction in FIG. 1) communicates with each other in the arrow A direction, which is the stacking direction, and contains an oxidant gas, for example, oxygen An oxidant gas inlet communication hole 30a for supplying gas, a cooling medium inlet communication hole 32a for supplying a cooling medium, and a fuel gas outlet communication hole 34b for discharging a fuel gas, for example, a hydrogen-containing gas, Arranged in the direction of arrow C (vertical direction).

  The other end edge of the fuel cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, a fuel gas inlet communication hole 34a for supplying fuel gas, and a cooling medium outlet communication hole for discharging the cooling medium. 32b and an oxidant gas outlet communication hole 30b for discharging the oxidant gas are arranged in the direction of arrow C.

  An oxidant gas flow path 36 that communicates with the oxidant gas inlet communication hole 30a and the oxidant gas outlet communication hole 30b is provided on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 10.

  A fuel gas flow path 38 communicating with the fuel gas inlet communication hole 34 a and the fuel gas outlet communication hole 34 b is formed on the surface 14 a of the first separator 14 facing the electrolyte membrane / electrode structure 10. Between the surface 14 b of the first separator 14 and the surface 16 b of the second separator 16, a cooling medium flow path 40 communicating with the cooling medium inlet communication hole 32 a and the cooling medium outlet communication hole 32 b is formed.

  As shown in FIGS. 1 and 2, the first seal member 42 is integrated with the surfaces 14 a and 14 b of the first separator 14 around the outer peripheral end of the first separator 14. The second seal member 44 is integrated with the surfaces 16 a and 16 b of the second separator 16 around the outer peripheral end portion of the second separator 16.

  As shown in FIG. 2, the first seal member 42 includes a first convex seal 42 a that contacts the gas diffusion layer 26 a constituting the electrolyte membrane / electrode structure 10, and a second seal member 44 of the second separator 16. And a second convex seal 42b in contact therewith. The second seal member 44 constitutes a flat seal on the surface in contact with the first convex seal 42a. Instead of the second convex seal 42b, the second seal member 44 may be provided with a convex seal (not shown), and the first seal member 42 may be constituted by a flat seal.

  For the first seal member 42 and the second seal member 44, for example, EPDM, NBR, fluororubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Or a packing material is used.

  As shown in FIG. 1, the first separator 14 has a supply hole portion 46 that communicates the fuel gas inlet communication hole 34a with the fuel gas passage 38, and the fuel gas passage 38 communicates with the fuel gas outlet communication hole 34b. A discharge hole 48 is formed.

  Next, a method for manufacturing the electrolyte membrane / electrode structure 10 will be described below.

  First, as shown in FIG. 4, the surface 18a of the solid polymer electrolyte membrane 18 is provided with an electrode catalyst layer 23a constituting the anode electrode 20, and the surface 18b of the solid polymer electrolyte membrane 18 has a cathode An electrode catalyst layer 23 b constituting the electrode 22 is provided.

  Further, as shown in FIG. 5A, a rectangular base layer 24a is formed in the gas diffusion layer 26a constituting the anode electrode 20 corresponding to the region where the electrode catalyst layer 23a is provided. Further, as shown in FIG. 5B, the gas diffusion layer 26a on which the base layer 24a is formed is first screen-printed in a region where the base layer 24a is not provided, that is, on the outer peripheral edge. An adhesive (for example, a viscosity of 230 Pa · s) is applied to form the first adhesive layer 28a. The first adhesive layer 28a does not rise from the gas diffusion layer 26a, and the thickness of the gas diffusion layer 26a is the same as that before coating. This is because it is absorbed by the surface irregularities and the porosity.

  In the first adhesive layer 28a, after the first adhesive is dried and cured, as shown in FIG. 5C, the second adhesive (for example, viscosity) is superimposed on the first adhesive layer 28a. 25 Pa · s) is applied to form the second adhesive layer 28 b. For this reason, the adhesive layer 28 is provided in the gas diffusion layer 26a. Here, the term “cured” includes the so-called complete curing as well as the semi-cured state. The semi-cured refers to a state in which the surface layer is hardened. The state that does not flow due to its own weight.

  On the other hand, as shown in FIG. 6A, a rectangular base layer 24b is formed in the gas diffusion layer 26b constituting the cathode electrode 22 corresponding to the region where the electrode catalyst layer 23b is provided. Further, as shown in FIG. 6B, the gas diffusion layer 26b on which the base layer 24b is formed has a first region formed by screen printing in a region where the base layer 24b is not provided, that is, on the outer peripheral edge. An adhesive (for example, a viscosity of 230 Pa · s) is applied to form the first adhesive layer 29a.

  In the first adhesive layer 29a, after the first adhesive is dried and cured, as shown in FIG. 6C, a second adhesive (for example, having a viscosity) is stacked on the first adhesive layer 29a. 25 Pa · s) is applied to form the second adhesive layer 29 b. Therefore, the adhesive layer 29 is provided in the gas diffusion layer 26b. The first adhesive layer 29a does not rise from the gas diffusion layer 26b, and the thickness of the gas diffusion layer 26b is the same as before coating. This is because it is absorbed by the surface irregularities and the porosity.

  Next, as shown in FIG. 7, on the surface 18a side of the solid polymer electrolyte membrane 18, a gas diffusion layer 26a is disposed with the adhesive layer 28 facing the outer peripheral edge 18ae, and the solid polymer electrolyte membrane The gas diffusion layer 26b is disposed on the 18 surface 18b side so that the adhesive layer 29 faces the outer peripheral edge 18be. At this time, as shown in FIG. 8, the surface 26 as of the gas diffusion layer 26 a has an uneven shape, and the uneven shape is embedded in the adhesive layer 28.

  Then, by performing a hot press process, the second adhesive layer 28b is bonded to the outer peripheral edge portion 18ae, while the second adhesive layer 29b is bonded to the outer peripheral edge portion 18be. As a result, the electrolyte membrane / electrode structure 10 is manufactured.

  The operation of the fuel cell 12 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 30a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 34a. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 32a.

  For this reason, the oxidant gas is introduced into the oxidant gas flow path 36 of the second separator 16 from the oxidant gas inlet communication hole 30a and moves in the direction of arrow B to the cathode electrode 22 of the electrolyte membrane / electrode structure 10. Supplied. On the other hand, the fuel gas is introduced from the fuel gas inlet communication hole 34 a through the supply hole 46 into the fuel gas flow path 38 of the first separator 14. The fuel gas moves in the direction of arrow B along the fuel gas flow path 38 and is supplied to the anode electrode 20 of the electrolyte membrane / electrode structure 10.

  Therefore, in each electrolyte membrane / electrode structure 10, the oxidant gas supplied to the cathode electrode 22 and the fuel gas supplied to the anode electrode 20 are consumed by an electrochemical reaction in the electrode catalyst layers 23 a and 23 b. Power generation.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 22 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 30b. Similarly, the fuel gas consumed by being supplied to the anode electrode 20 passes through the discharge hole 48 and is discharged in the direction of arrow A along the fuel gas outlet communication hole 34b.

  The cooling medium supplied to the cooling medium inlet communication hole 32a is introduced into the cooling medium flow path 40 between the first separator 14 and the second separator 16, and then flows in the direction of arrow B. The cooling medium is discharged from the cooling medium outlet communication hole 32b after the electrolyte membrane / electrode structure 10 is cooled.

  In this case, in this embodiment, as shown in FIG. 2, an adhesive layer 28 is provided between the outer peripheral edge 18ae of the solid polymer electrolyte membrane 18 and the outer peripheral edge of the gas diffusion layer 26a. The adhesive layer 28 includes a first adhesive layer 28a provided on the gas diffusion layer 26a side, a second adhesive layer 28b provided on the solid polymer electrolyte membrane 18 side, and having a lower viscosity than the first adhesive layer 28a. have.

  Thus, the first adhesive provided on the gas diffusion layer 26a side has a higher viscosity than the second adhesive provided on the solid polymer electrolyte membrane 18 side. Therefore, as shown in FIG. 8, the first adhesive (first adhesive layer 28a) does not easily penetrate into the gas diffusion layer 26a, and the first adhesive remains on the surface 26as of the gas diffusion layer 26a. Form a smooth surface.

  Further, when the second adhesive (second adhesive layer 28b) is applied onto the first adhesive, the low-viscosity second adhesive penetrates into the gas diffusion layer 26a and the first adhesive layer 28a. It is suppressed by. Therefore, the second adhesive layer 28b having a predetermined thickness can be formed on the surface 26as (on the first adhesive layer 28a) of the gas diffusion layer 26a.

  Thereby, in the adhesive layer 28, the uneven part of the surface 26as of the gas diffusion layer 26a is reliably covered by the first adhesive layer 28a and the second adhesive layer 28b. For this reason, when the gas diffusion layer 26a and the solid polymer electrolyte membrane 18 are joined (adhered), local biting into the solid polymer electrolyte membrane 18 is effectively reduced. Therefore, damage to the solid polymer electrolyte membrane 18 is suppressed as much as possible.

  Furthermore, since the second adhesive has a low viscosity, it is possible to ensure good adhesiveness. Moreover, the second adhesive can fill the smear of the first adhesive and can maintain flatness. Thereby, the adhesive strength with the solid polymer electrolyte membrane 18 is improved, and there is an advantage that the gas diffusion layer 26a and the solid polymer electrolyte membrane 18 can be firmly bonded.

  On the other hand, an adhesive layer 29 is provided between the outer peripheral edge portion 18be of the solid polymer electrolyte membrane 18 and the outer peripheral edge portion of the gas diffusion layer 26b. The adhesive layer 29 is configured in the same manner as the adhesive layer 28, and the same effect as described above can be obtained.

  Note that an intermediate layer having adhesiveness may be provided between the first adhesive and the second adhesive, and the base layers 24a and 24b are not necessarily provided.

DESCRIPTION OF SYMBOLS 10 ... Electrolyte membrane / electrode structure 12 ... Fuel cell 13 ... Fuel cell stack 14, 16 ... Separator 18 ... Solid polymer electrolyte membrane 18a, 18b ... Surface 18ae, 18be ... Outer peripheral edge 20 ... Anode electrode 22 ... Cathode electrode 23a , 23b ... Electrode catalyst layer 24a, 24b ... Underlayer 26a, 26b ... Gas diffusion layer 28, 28a, 28b, 29, 29a, 29b ... Adhesive layer 30a ... Oxidant gas inlet communication hole 30b ... Oxidant gas outlet communication hole 32a ... cooling medium inlet communication hole 32b ... cooling medium outlet communication hole 34a ... fuel gas inlet communication hole 34b ... fuel gas outlet communication hole 36 ... oxidant gas flow path 38 ... fuel gas flow path 40 ... cooling medium flow path 42, 44 ... Seal member

Claims (1)

An electrode catalyst layer and a gas diffusion layer are provided on both sides of the solid polymer electrolyte membrane, respectively, and an outer peripheral end portion of the electrode catalyst layer is an outer peripheral end portion of the solid polymer electrolyte membrane and an outer peripheral end of the gas diffusion layer. A method for producing an electrolyte membrane / electrode structure for a fuel cell disposed inward of a part,
A first adhesive is applied to the outer peripheral edge of the gas diffusion layer that extends outward from the outer peripheral edge of the electrode catalyst layer and is joined to the outer peripheral edge of the solid polymer electrolyte membrane. Forming an adhesive layer;
After the first adhesive is cured, forming a second adhesive layer by applying a second adhesive having a lower viscosity than the first adhesive to the first adhesive layer;
Bonding the outer peripheral edge of the solid polymer electrolyte membrane and the outer peripheral edge of the gas diffusion layer with the second adhesive layer;
A method for producing an electrolyte membrane / electrode structure for a fuel cell, comprising:

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