Kinetically Controlled Growth of Polyhedral Bimetallic Alloy Nanocrystals Exclusively Bound by High-Index Facets: Au–Pd Hexoctahedra



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Au–Pd alloy nanocrystals (NCs) with a hexoctahedral structure, enclosed exclusively by high-index {541} facets, are prepared via the simultaneous reduction of Au and Pd precursors without added seeds or additional metal ions as structure-regulating agents. Manipulating the NC growth kinetics via control of the relative amount of reductant is the key synthetic lever for controlling the morphology of the Au–Pd NCs. The hexoctahedral Au–Pd NCs exhibit higher catalytic performance toward the electro-oxidation of ethanol than low-index-faceted Au–Pd NCs.