Synthesis of Pt-Ni 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 high‐activity catalysts. We report herein the preparation of Pt–Ni alloy NCs by tuning their shape from concave‐nanocubic (CNC) to...

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Published in:Angewandte Chemie International Edition 2014-11, Vol.53 (46), p.12522-12527
Main Authors: Xu, Xiling, Zhang, Xin, Sun, Hui, Yang, Ying, Dai, Xiaoping, Gao, Jinsen, Li, Xueyong, Zhang, Pengfang, Wang, Hong-Hui, Yu, Neng-Fei, Sun, Shi-Gang
Format: Article
Language:English
Subjects:
alloys
Catalysis
Catalysts
Computer numerical control
electrocatalysis
electrooxidation
Glycine
Nanocrystals
Nanostructure
oxygen reduction reaction
Platinum base alloys
Self assembly
Synthesis
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Summary: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 high‐activity catalysts. We report herein the preparation of Pt–Ni 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–Ni alloy, the as‐prepared CNC and HOH Pt–Ni alloy NCs exhibited excellent catalytic properties for the electrooxidation of methanol and formic acid, as well as for the oxygen reduction reaction (ORR). In good shape: By varying the amount of glycine present, the shape of Pt–Ni alloy nanocrystals could be tuned from concave nanocubes (CNCs) to nanocubes and hexoctahedra (HOHs; see picture). Glycine was used to manipulate the nucleation and growth rates of the Pt–Ni alloy NCs for the formation of CNCs by self‐assembly and HOHs by control of crystal growth. Pt–Ni CNCs and HOHs showed excellent electrocatalytic properties. PVP=polyvinylpyrrolidone.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201406497