Scalable Bromide-Triggered Synthesis of Pd@Pt Core-Shell Ultrathin Nanowires with Enhanced Electrocatalytic Performance toward Oxygen Reduction Reaction.

摘要: This article reports a novel scalable method to prepare ultrathin and uniform Pd@Pt nanowires (NWs) with controllable composition shell thickness, high aspect ratio, smooth surface, triggered by bromide ions via galvanic replacement reaction between PtCl62– Pd NWs. It was found that played vital role in initiating promoting the reaction. The served as capping oxidized etching agents, counterbalancing Pt deposition on surface give final core–shell nanostructures. Such counterbalance formation PtBr62– lower redox potential could rate be responsible for full coverage of shell. deposited NWs is important enhancement activity stability, which depend strongly content thickness. Significantly, 21.2% (atomic ratio) exhibited highest mass (810 mA mg–1Pt) s...