Abstract
We have recently developed a method for obtaining chalcogenide catalysts, which is based on surface modification of ruthenium black particles rather than the synthesis of a bulk metal-chalcogen compound [1]. Electrochemical, non- electrochemical and fuel cell testing have revealed high ORR activity and very good methanol tolerance of such surface chalcogenide catalysts [2,3]. Uniquely for Pt-free cathode catalysts, such surface chalcogenides also exhibit very good performance durability under fuel cell operating conditions at 70{degree sign}C. In this paper, we focus on hydrogen-air and direct methanol fuel cell performance of chalcogen-modified Ru blacks as well as on the mechanism of oxygen reduction on such catalysts, as determined in rotating ring disk-electrode (RRDE) studies.
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