MEMBRANE-ELECTRODE ASSEMBLY, AND MEMBRANE-ELECTRODE-(GAS DIFFUSION LAYER) ASSEMBLY AND SOLID POLYMER FUEL CELL EACH COMPRISING THE SAME

摘要

A membrane-electrode assembly 1 having an anode catalyst layer 20 and a cathode catalyst layer 30 which are mutually opposing and a polymer electrolyte membrane 10 formed between the anode catalyst layer 20 and cathode catalyst layer 30, wherein the anode catalyst layer 20 has a plurality of polymer layers 20a, 20b containing a polymer in which a repeating unit (a) with an ion-exchange group and a repeating unit (b) with no ion-exchange group are arranged in a random or block fashion, and the polymer in the polymer layer 20a in closest proximity to the polymer electrolyte membrane 10 is the polymer with the lowest block character of the repeating units (a) and (b).