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Issue 7, 2014
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Eco-friendly synthesis of bimetallic AuAg nanoparticles

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Abstract

In this study we report a friendly route to produce colloidal AuAg bimetallic nanoparticles (NPs) using glycerol as a reducing chemical in alkaline medium. Ultraviolet spectroscopy (UV-Vis) and transmission electron microscopy (TEM) confirmed the formation of colloidal NPs. The nanoparticles were also directly produced on carbon to yield Au/C, Ag/C and AuAg/C. Extended X-ray absorption fine-structure (EXAFS) spectroscopy at the Au L3 edge evidenced surface segregation of silver in the AuAg/C material. Also the X-ray absorption near edge structure (XANES) region indicated a slight reduction in the Au 5d band occupancy due to the presence of silver. Since a fuel cell is a potent source of energy for the future, the catalytic properties of the NPs were investigated for anodic glycerol electro-oxidation reaction and results for AuAg NPs are compared with those for monometallic Au and Ag NPs. When compared with Au/C, the AuAg/C material displayed lower potential for glycerol electro-oxidation, reducing by 120 mV the onset potential for glycerol electro-oxidation. This means that the electro-oxidation of glycerol on the bimetallic catalyst is mainly affected by the ligand effect.

Graphical abstract: Eco-friendly synthesis of bimetallic AuAg nanoparticles

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Article information


Submitted
08 Jan 2014
Accepted
27 Mar 2014
First published
02 Apr 2014

New J. Chem., 2014,38, 2865-2873
Article type
Paper
Author version available

Eco-friendly synthesis of bimetallic AuAg nanoparticles

A. G. Garcia, P. P. Lopes, J. F. Gomes, C. Pires, E. B. Ferreira, R. G. M. Lucena, L. H. S. Gasparotto and G. Tremiliosi-Filho, New J. Chem., 2014, 38, 2865
DOI: 10.1039/C4NJ00041B

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