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Synthesis of a Au‐on‐Pd Heteronanostructure Stabilized by Citrate and its Catalytic Application
Author(s) -
Wang Zhifei,
Zheng Shuang,
Wan Neng,
Zhang Liming,
Wang Qilong,
He gyue,
Huang Yaji
Publication year - 2013
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201300152
Subject(s) - catalysis , molar ratio , ion , crystallite , chemistry , electrochemistry , nanoparticle , ethanol , nuclear chemistry , inorganic chemistry , reactivity (psychology) , materials science , nanotechnology , organic chemistry , electrode , crystallography , medicine , alternative medicine , pathology
The preparation of Au‐on‐Pd heteronanostructure (HNS) using citrate‐stabilized polycrystalline Pd nanoparticles (NPs) as the seeds is described. The resulting Au‐on‐Pd HNS is characterized and it is found that the formation of Au‐on‐Pd HNS depends greatly on a ratio between Pd seeds and AuCl 4 − ions added and the optimal molar ratio is 10:1. If fewer AuCl 4 − ions are added (Pd/Au ratio is 100:1), the growth of Au NPs only occurs on part of the Pd seeds’ surface. The addition of more AuCl 4 − ions (Pd/Au ratio is 5:1) hinders the growth of Au NPs on the Pd seeds’ surface. To demonstrate the catalytic performance, the electrochemistry oxidation of ethanol and the reduction of p‐nitrophenol by NaBH 4 are chosen to examine the catalytic activity of Au‐on‐Pd HNS. Pd seeds, Au NPs, and poly(vinyl pyrrolidone) (PVP)‐stabilized PdAu nanoalloy are used as the references for comparison. In the first reaction, the catalytic reactivity of Au‐on‐Pd HNS is better than that of corresponding pure Pd or Au NPs, while the opposite occurs for the latter reaction. The catalytic activity of Au‐on‐Pd HNS is much higher than that of PVP‐stabilized PdAu nanoalloy.