Porous single-crystalline AuPt@Pt bimetallic nanocrystals with high mass electrocatalytic activities

Chemical Science
Lei ZhangJinlong Gong

Abstract

Au-Pt bimetallic structures can effectively improve the activity and stability of catalysts in several fuel cell related electrochemical reactions. However, most of the methods for the preparation of Au-Pt nanocrystals (NCs) with core-shell structures are step-wise syntheses, which are adverse for reducing the production costs and the scale-up process. This paper describes a one-pot synthesis of rhombic dodecahedral AuPt@Pt bimetallic nanocrystals with dendritic branches. The dendritic branches on the surfaces were grown through oriented attachment and the whole particle exhibited a single-crystal structure. The thickness of the dendritic Pt shell can be controlled by tuning the introduced Pt precursor. With the Au-enhancement effect arising from the Au-Pt bimetallic core and high atom utilization efficiency provided by the porous structure, the AuPt@Pt bimetallic NCs exhibited greatly enhanced electrocatalytic properties (e.g. oxygen reduction reaction and formic acid oxidation) than those of the commercial Pt/C catalyst.

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Citations

Mar 20, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Shuai Yin, Yi Ding
May 17, 2017·Chemical Science·Wei WangChang-Jun Liu
Oct 21, 2016·Angewandte Chemie·Bingqing ZhangCan Li
Oct 27, 2018·ACS Applied Materials & Interfaces·Qiwen ZhangYi Ding

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Methods Mentioned

BETA
scanning
transmission electron microscopy
electron diffraction
X-ray
atomic emission spectroscopy

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