Fuel electrode catalyst for fuel cell, electrode/membrane assembly, and fuel cell and fuel cell system provided with the electrode/membrane assembly

摘要

A fuel electrode catalyst for fuel cell excellent in CO poisoning resistance, an electrode/membrane assembly using the fuel electrode catalyst for fuel cell, and a fuel cell and a fuel cell system including the electrode/membrane assembly are provided. The fuel electrode catalyst for fuel cell comprises a platinum-ruthenium first alloy catalyst and a second alloy catalyst obtained by partially substituting ruthenium of the platinum-ruthenium first alloy catalyst by a metal lower dissolving potential than ruthenium. The electrode/membrane assembly 7 comprises three layers of a second alloy catalyst layer 3, a first alloy catalyst layer 4, and a ruthenium catalyst layer 5 arranged in this order from a polymer electrolytic membrane 1 side toward a gas diffusion layer 13 side.

主权项

1. An electrode/membrane assembly for a fuel cell, comprising a fuel electrode bonded to one surface of a polymer electrolyte membrane and an air electrode bonded to the other surface of the polymer electrolyte membrane,
wherein the fuel electrode comprises: a first catalyst layer consisting of a platinum-ruthenium alloy first catalyst supported by carbon, in which platinum Pt and ruthenium Ru are included at a mass % of Pt:Ru=10-95:5-90, wherein Pt+Ru=100 and, a second catalyst layer laminated to both the first catalyst layer and the polymer electrolyte membrane, the second catalyst layer consisting of a platinum-ruthenium-metal (M) alloy second catalyst, in which platinum Pt, ruthenium Ru and the metal M are included at a mass % of Pt:Ru:M=10-95:1-90:0.001-30, wherein:
Pt+Ru+M=100, the second catalyst is supported by carbon and laminated to the polymer electrolyte membrane, and the metal (M) has a lower dissolving potential than ruthenium.