Promotional Effect of Ag on the Catalytic Activity of Au for Glycerol Electrooxidation in Alkaline Medium

Author(s)

Garcia, Amanda C. ^[1] ; Caliman, Julia ^[2] ; Ferreira, Eduardo B. ^[1] ; Tremiliosi-Filho, Germano ^[1] ; Linares, Jose J. ^[2]

Affiliation

^[1] Univ Sao Paulo, Inst Qum Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Brasilia, Inst Quim, BR-70910900 Brasilia, DF - Brazil

• Document type: Journal article
• Source: CHEMELECTROCHEM; v. 2, n. 7, p. 1036-1041, JUL 15 2015.
• Web of Science Citations: 10

Abstract

The potential of silver as an auxiliary metal for gold in the electrochemical oxidation of glycerol in alkaline medium is studied. Three bimetallic materials (Au3Ag/C, AuAg/C, and AuAg3/C) and the corresponding monometallic reference materials (Au/C and Ag/C) are prepared by chemical reduction of their precursors with glycerol. Half-cell measurements evidence the beneficial effect of Ag on the electrocatalytic activity of Au for glycerol oxidation owing to decreased onset potential and higher current density in chronoamperometry, with an optimum formulation of AuAg/C. These results are confirmed by the single-cell performance of AuAg/C, which, despite having half the Au loading, has a higher open-circuit voltage than Au/C and a similar maximum power density. The results are correlated with the structural and electronic features of these materials, which are widely discussed in other works. (AU)

• FAPESP's process: 12/10856-7 - Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticles
• Grantee: Amanda Cristina Garcia
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 12/05627-9 - Synthesis of gold nanoparticles using glycerol as reducing agent in alkaline medium: study of the variables of synthesis and application for the ethanol oxidation.
• Grantee: Eduardo de Barros Ferreira
• Support type: Scholarships in Brazil - Scientific Initiation