MEMBRANE-ELECTRODE ASSEMBLY FOR FUEL CELL, MANUFACTURING METHOD THEREOF, AND SOLID POLYMER FUEL CELL USING MEMBRANE-ELECTRODE ASSEMBLY

摘要

By stacking a gas diffusion layer, which comprises a first conductive layer comprising a specific conductive carbon material and a specific polymer, on a catalyst layer in such a manner that the first conductive layer is in contact with the catalyst layer and the polymer in the first conductive layer is present with a higher density at the surface of the layer in contact with the catalyst layer than at the surface not in contact with the catalyst layer, a membrane-electrode assembly having a strong adhesion between the catalyst layer and the gas diffusion layer can be provided. Further, a fuel cell membrane-electrode assembly that reduces the position gap between a catalyst layer and a conductive porous layer, and between a conductive porous layer and a conductive porous substrate can be provided by using a gas diffusion layer that further comprises a second conductive layer formed on the first conductive layer and that comprises a specific conductive carbon material and a specific polymer, and stacking the gas diffusion layer on the catalyst layer in such a manner that the polymer in the first conductive layer is present with a higher density at the surface of the layer in contact with the catalyst layer than at the surface in contact with the second conductive layer and the polymer in the second conductive layer is present with a higher density at the surface of the layer in contact with the first conductive layer than at the surface not in contact with the first conductive layer.