Controlled synthesis and synergistic effects of graphene-supported PdAu bimetallic nanoparticles with tunable catalytic properties

Nanoscale
Chang-Hai LiuSui-Dong Wang

Abstract

Graphene-supported bimetallic nanoparticles are promising nanocatalysts, which can show strong and tunable catalytic activity and selectivity. Herein room-temperature-ionic-liquid-assisted metal sputtering is utilized to synthesize PdAu bimetallic nanoparticles on graphene with bare surface, small size, high surface density and controlled Pd-to-Au ratio. This controllable synthetic approach is green-chemistry compatible and totally free of additives and byproducts. The supported PdAu nanoparticles show excellent catalytic capabilities for both oxidation and reduction reactions, strongly dependent on the Pd-to-Au ratio. A strong correlation among catalytic performance, bimetallic composition and charge redistribution in the PdAu nanoparticles has been demonstrated. The results suggest that sufficient Au d-holes appear to be significant to the catalysis of oxidation reaction, and a metallic Pd surface is critical to the catalysis of reduction reaction. By the present method, the bimetallic combination can be tailored for distinct types of catalytic reactions.

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Citations

Feb 17, 2018·Advanced Materials·Hao FangQingsheng Wu
Nov 8, 2018·Chemical Communications : Chem Comm·Zheng ChenYadong Li
Feb 28, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shengqiang HuJianxiu Wang
Jun 3, 2021·Nanomaterials·Ahmed M A ElSheikhDiogo M F Santos
Dec 1, 2017·Accounts of Chemical Research·Yohei IshidaTetsu Yonezawa
Mar 10, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Lianlian DengTetsu Yonezawa

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