| 摘要 |
Provision of a process for producing a membrane/electrode assembly for a polymer electrolyte fuel cell which can produce a high output voltage in a wide current density range. A process for producing a membrane/electrode assembly for a polymer electrolyte fuel cell, comprising an anode and a cathode each having a catalyst layer, and an electrolyte membrane interposed between the catalyst layer of the anode and the catalyst layer of the cathode; said process comprising: a gas diffusion layer-forming step of applying a gas diffusion layer-coating fluid containing carbon fibers having a fiber diameter of from 1μm to 50μm and a proton conductive polymer, on a substrate to form a gas diffusion layer; a removal step of removing the substrate from the gas diffusion layer formed in the gas diffusion layer-forming step; and a step of disposing at least one such a gas diffusion layer thus prepared, on a surface of the catalyst layer of at least one of the anode and the cathode, on which the electrolyte membrane is not disposed.
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