Pt-Au/C catalysts, core/shell structure, 1-D materials, oxygen reduction reaction (ORR), long-term durability
Nanostructured materials have been studied intensively due to their board potential applications in the energy field. A great deal of effort has been devoted to developing high efficient nanocatalysts for oxygen reduction reaction (ORR). In this study, carbon-supported Pt-Au nanorods with a core/shell structure are prepared by a facile wet chemical reduction method and their ORR activities are investigated. The electro-catalytic activity and morphology correlation of Pt-Au nanomaterials are also explored in order to provide a novel way for the fabrication of high performance 1-D nanorods. It can be observed that for Au@Pt nanorods (initial reduction of Au precursor and following deposition of Pt, Au core/Pt shell structure), the surface is completely composed of Pt species, while the surface of Pt@Au (initial reduction of Pt precursor and following deposition of Au, Pt core/Au shell structure) nanorods consists of Pt and Au species, confirming the formation of core/shell structure of the Pt-Au nanorods. On the other hand, the ORR activities and long-term durability of Au@Pt and Pt@Au nanorods are both better than that of commercial Pt/C nanoparticles. The promotional effect of Pt-Au nanorods may be attributed to the surface Pt enrichment and the 1-D morphology, favorably enhancing the ORR activity.