Patent ID: 7919215

Claim:
A corrosion-resistant oxygen electrode for fuel cell, which uses an acidic electrolyte, comprising: an electrode substrate; a gold layer as a promoter formed on the electrode substrate; and a transition metal oxide layer as a catalyst formed on the gold layer, the transition metal oxide layer comprising at least one transition metal oxide selected from Ta 2 O 5 , Nb 2 O 5 , SnO 2 , TiO 2 , V 2 O 5 , and ZrO x1 wherein the value of X1 satisfies 0.25<X1<2.0 at a thickness of 20 to 30 nm, wherein the transition metal oxide layer is in a oxygen-deficient state, and wherein the oxygen electrode is configured as a part of the fuel cell comprising the acidic electrolyte and a fuel electrode.