Abstract
Abstract A facile hydrothermal route has been developed to synthesize the highly branched Pt58Cu42 nanoparticles via mixing the H2PtCl6 and CuCl2 with octadecylamine. The Pt58Cu42 after post treatment forms a dandelion flower 3-D structure. A combination of both the branched shape and Pt Cu composition effects in the Pt58Cu42-nanoparticles shows superior electrocatalytic activity and durability to commercial Pt black for oxygen reduction reaction. The mechanism for the de-alloying and reconstructing of the Pt58Cu42-nanoparticles in electrochemical activity and durability tests has been proposed. It is found that after the durability process, the Pt58Cu42 precursor alloy changes into a substantially Pt enriched Pt Cu alloy (Pt79Cu21) with a Pt skin. The Pt skin effectively prevents the further dissolution of the Cu below the near-surface to enhance its durability. What's more, the Pt skin exposed to (111) planes which have the lowest surface energy among the low-index planes further promotes the improvement of durability of the Pt Cu catalyst.
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