No abstract

Carbon-supported Ir, Rh, IrSe, and RhSe were synthesized and subjected to electrochemical and physical (XRD, TEM) characterizations. ORR activity, peroxide generation, and methanol tolerance on carbon-supported Ir, Rh, IrSe, and RhSe were compared to a similarly prepared Pt and RuSe catalysts at comparable loading. Electrochemical characteristics of selenides studied using cyclic voltammetry and Cu stripping demonstrated complete suppression of the formation of oxygenated species and Hupd on the catalyst surface by Se. In presence of methanol, all selenides exhibited high methanol tolerance, and their oxygen reduction activities were in the order of Ir