Nonnoble transition metal perovskites - of mixed valency as cathode catalysts in electrochemical ccells

摘要

A cathode catalyst for an alkaline electrolyte electro-chemical cell comprises an nonhoble metal perovskite AxAy'BO3, where A, A' are metals having different valencies from gps. IA, IIA or IIIB and B is a nonnoble transition metal from gps. IVB to VIIB or VIII and x + y = 1. The perovskite is a solid soln. of ABO3, A'BO3 having a different valency in the two oxides and the sum of valencies of A and B equalling 6 for each oxide. Cell may be a fuel cell, or one for prodn of organic chemicals.