ELECTRODE CATALYST FOR FUEL CELL AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is an electrode catalyst for fuel cells having high cell output and high fuel efficiency, wherein activation of a catalyst, which is composed of an alloy of platinum and cobalt, is improved. Also disclosed is a method for producing such an electrode catalyst. Specifically disclosed is an electrode catalyst for fuel cells wherein catalyst particles composed of platinum and cobalt are loaded on a conductive carrier. This electrode catalyst is characterized in that the catalyst particles have a composition (molar) ratio of platinum:cobalt = 3:1-5:1. A high cell voltage can be obtained when the ratio of platinum to cobalt is within the range from 3:1 to 5:1. When the ratio of platinum to cobalt is less than 3:1, the amount of cobalt dissolved from the catalyst is increased. When the ratio of platinum to cobalt is more than 5:1, the catalyst activity is decreased.