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Synthesis of Pt¨CNi Alloy Nanocrystals with High-Index Facets and Enhanced Electrocatalytic Properties

The shape-controlled synthesis of multicomponent metal nanocrystals (NCs) bounded by high-index facets (HIFs) is of significant importance in the design and synthesis of highactivity catalysts. We report herein the preparation of Pt¨CNi alloy NCs by tuning their shape from concave-nanocubic (CNC) to nanocubic and hexoctahedral (HOH). Owing to the synergy of the HIFs and the electronic effect of the Pt¨CNi alloy, the as-prepared CNC and HOH Pt¨CNi alloy NCs exhibited excellent catalytic properties for the electrooxidation of methanol and formic acid, as well as for the oxygen reduction reaction (ORR).

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