POLYMER ELECTROLYTE COMPOSITION, POLYMER ELECTROLYTE MEMBRANE USING SAME, CATALYST COATED MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY AND POLYMER ELECTROLYTE FUEL CELL

摘要

The objective of the present invention is to provide: a practically excellent polymer electrolyte composition which has excellent chemical stability that is capable of withstanding a strong oxidizing atmosphere during the operation of a fuel cell, while achieving excellent proton conductivity under low humidification conditions, excellent mechanical strength and excellent physical durability; a polymer electrolyte membrane which uses this polymer electrolyte composition; a membrane electrode assembly; and a solid polymer fuel cell. A polymer electrolyte composition which contains (A) an ionic group-containing polymer, (B) a compound having an azole ring and (C) a transition metal-containing additive, and wherein the transition metal is composed of one or more metals selected from the group consisting of cobalt, nickel, ruthenium, rhodium, palladium, silver and gold.