title: Controlled synthesis and synergistic effects of graphene-supported PdAu bimetallic nanoparticles with tunable catalytic properties.
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.
authors.affiliation: Soochow University-Western University Joint Centre for Synchrotron Radiation Research, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R. China. wangsd@suda.edu.cn zhkang@suda.edu.cn apannale@suda.edu.cn.
authors.forename: Chang-Hai
authors.initials: CH
authors.lastname: Liu
authors.forename: Rui-Hua
authors.initials: RH
authors.lastname: Liu
authors.forename: Qi-Jun
authors.initials: QJ
authors.lastname: Sun
authors.forename: Jian-Bing
authors.initials: JB
authors.lastname: Chang
authors.forename: Xu
authors.initials: X
authors.lastname: Gao
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Shuit-Tong
authors.initials: ST
authors.lastname: Lee
authors.forename: Zhen-Hui
authors.initials: ZH
authors.lastname: Kang
authors.forename: Sui-Dong
authors.initials: SD
authors.lastname: Wang