ChemInform Abstract: New Catalysts for Oxygen Reduction Based on Transition-Metal Sulfides.

✍ Scribed by V. TRAPP; P. CHRISTENSEN; A. HAMNETT

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 28 KB
• Volume: 28
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199708010

✦ Synopsis

MoRuS and MoRuSe catalysts for the electrochemical reduction of oxygen are prepared from Ru3(CO)12, Mo(CO)6, and S or Se in xylene at 136 . degree.C and subsequent treatment with Ar or H2 at 350 • C. These catalysts, the structure of which resembles that of commonly used hydrodesulfurization catalysts, are attractive as cathodes in direct methanol fuel cells (DMFC) and in solid-polymer electrolyte cells. Exchange of S for Se results in a higher catalytic activity at high current densities. Ru sites are identified as active catalytic centers. Deposition onto carbon supports yields homogenously distributed particles of 5nm size. Unlike the conventional Pt-based electode, the new MoRuS-based electrode is not prone to depolarization due to methanol crossover from the anode of the DMFC. -(TRAPP, V.; CHRISTENSEN, P.;