Synthesis of graphene-supported monodisperse AuPd bimetallic nanoparticles for electrochemical oxidation of methanol

doi:10.1088/1674-1056/24/7/078109

Abstract

Monodisperse AuPd bimetallic nanoparticles (NPs) with different compositions are synthesized by using oleylamine (OAm) as reducing reagent, stabilizer, and solvent. To obtain AuPd solid solution NPs, Pd–OAm and Au–OAm precursors are firstly prepared by mixing OAm with Palladium (II) acetylacetonate (Pd(acac)₂) and HAuCl₄, respectively. Then Pd–OAm and Au–OAm precursor solutions are injected into a hot oleylamine solution to form AuPd NPs. The size of these NPs ranges from 6.0 to 8.0 nm and the composition is controlled by varying the precursor ratio. The AuPd NPs are loaded onto reduced graphene oxide (RGO) sheets to make catalysts. Alloy NPs show high electrocatalytic activity and stability toward methanol oxidation in the alkaline media. Their catalytic activity for methanol oxidation is found to be dependent on the NP composition. As the Pd component increases, the peak current densities during the forward scan gradually increase and reach the maximum at AuPd₂. The enhancement of alloy NPs for methanol oxidation can be attributed to a synergistic effect of Au and Pd on the surface of alloy NPs.

Keywords: AuPd alloy nanoparticles reduced graphene oxide methanol oxidation

Received: 03 May 2015
Revised: 11 May 2015
Accepted manuscript online:

PACS:	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	82.47.-a	(Applied electrochemistry)
	88.30.M-	(Fuel cell component materials)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 61335006) and the National Basic Research Program of China (Grant No. 2013CBA01603).

Corresponding Authors: Gao Hong-Jun
E-mail: hjgao@iphy.ac.cn

Cite this article:

Xiao Hong-Jun (肖红君), Shen Cheng-Min (申承民), Shi Xue-Zhao (时雪钊), Yang Su-Dong (杨苏东), Tian Yuan (田园), Lin Shao-Xiong (林少雄), Gao Hong-Jun (高鸿钧) Synthesis of graphene-supported monodisperse AuPd bimetallic nanoparticles for electrochemical oxidation of methanol 2015 Chin. Phys. B 24 078109

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Synthesis of graphene-supported monodisperse AuPd bimetallic nanoparticles for electrochemical oxidation of methanol

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