Proton-conductive inorganic material for fuel cell and fuel cell anode employing the same

摘要

The present invention aims to provide a fuel cell anode, a membrane electrode assembly and a fuel cell, so as to obtain high electric power. The fuel cell anode has an electrode catalyst layer, and the electrode catalyst layer comprises a supported catalyst comprises electrically conductive carriers and fine catalytic particles supported thereon, a proton-conductive inorganic oxide supporting SiO2 on its surface, and a proton-conductive organic polymer binder. The SiO2 supported on the inorganic oxide prevents the oxide particles from growing, to ensure the high electric power. It is necessary to control the mixing ratios among the supported catalyst, the proton-conductive oxide and the proton-conductive binder in particular ranges.

主权项

1. A fuel cell anode which comprises an electrode catalyst layer comprising:
a supported catalyst comprising electrically conductive carriers and fine catalytic particles supported on said electrically conductive carriers, a proton-conductive inorganic oxide supporting SiO2 in the form of fine particles on its surface, said proton-conductive inorganic oxide comprising oxide carriers comprising at least one element Y selected from the group consisting of Ti, Zr and Sn, and said proton-conductive inorganic oxide comprising oxide particles comprising at least one element X selected from the group consisting of W, Mo and V, said oxide particles being supported on the oxide carriers and the ratio (X/Y) of the elements X and Y is in the range of 0.0001 to 5, and a proton-conductive organic polymer binder; wherein the weight ratio (WSA+SiO2/Wc) of the SiO2-containing proton-conductive inorganic oxide (SA+SiO2) and the supported catalyst (C) is in the range of 0.037 to 0.25, the weight ratio (WP/WSA+SiO2) of the proton-conductive organic polymer binder (P) and the SiO2-containing proton-conductive inorganic oxide (SA+SiO2) is in the range of 3.5 to 12, and the weight ratio (WSiO2/WSA) of the SiO2 and the proton-conductive inorganic oxide (SA) is in the range of 0.1 to 0.5.