Abstract
Surface and structure of carbon-supported Pd 3Pt 1 (Pd 3Pt 1/C) bimetallic nanoparticles of small particle size can be tuned during synthesis through the use or nonuse of trisodium citrate (TC) as the complexing agent. The addition of TC during the synthesis results in Pd enrichment on the surface layers of the Pd 3Pt 1/C catalysts and to an abnormal lattice expansion as compared to that of pure Pd/C and Pt/C. However, without the addition of TC, a normal lattice constant and Pt enrichment on the surface layers of the catalysts are obtained. Among the prepared catalysts, the maximum activity for the oxygen reduction reaction (ORR) occurs for Pd 3Pt 1/C catalyst with Pt surface enrichment. Importantly, the Pd 3Pt 1/C catalysts with Pd surface enrichment exhibited substantially higher methanol tolerance during the ORR than both the Pd 3Pt 1/C catalyst with Pt surface enrichment and the Pt/C catalyst. Thus, Pd 3Pt 1/C catalysts may represent a methanol-tolerant ORR cathode catalyst.
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