ELECTRODE CATALYTIC LAYER FOR FUEL CELL, MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL COMPRISING THE ELECTRODE CATALYTIC LAYER, FUEL CELL COMPRISING THE MEMBRANE ELECTRODE ASSEMBLY, AND METHOD OF MANUFACTURING THE ELECTRODE CATALYTIC LAYER FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide an electrode catalytic layer for a fuel cell, in which the electrode catalytic layer is provided with a water-retaining distribution to improve output performance while securing sufficient proton conductivity and gas diffusion; to provide a membrane electrode assembly for a fuel cell comprising the electrode catalytic layer; to provide a fuel cell comprising the membrane electrode assembly; and to provide a method of manufacturing the electrode catalytic layer for the fuel cell.SOLUTION: The electrode catalytic layer 2 for the fuel cell includes: a first electrode catalytic layer 2a comprising composite catalyst particles each including at least a catalyst material on a surface, in which the surface of the catalyst material is coated with a polymer electrolyte; and a second electrode catalytic layer 2b comprising a catalyst material, an electron conductive material and the polymer electrolyte. While the first electrode catalytic layer 2a and the second electrode catalytic layer 2b are stacked in a membrane thickness direction, the water-retaining properties of the first electrode catalytic layer 2a and the second electrode catalytic layer 2b are different.