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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Au/C catalysts prepared by a green method towards C3 alcohol electrooxidation: A cyclic voltammetry and in situ FTIR spectroscopy study

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Bott-Neto, Jose L. [1] ; Garcia, Amanda C. [1] ; Oliveira, Vanessa L. [1] ; de Souza, Nyccolas E. [1] ; Tremiliosi-Filho, Germano [1]
Total Authors: 5
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Electroanalytical Chemistry; v. 735, p. 57-62, DEC 1 2014.
Web of Science Citations: 20

Gold electrocatalysts seems to be an interesting material for application in Alkaline Fuel Cells (AFC) since several studies have reported the electro-catalytic activity of gold-based catalysts for various heterogeneous catalyzed oxidation reactions like oxidation of small organic molecules. In this paper, we synthesized Au nanoparticles (Au Nps) dispersed onto Vulcan carbon substrate using a straightforward glycerol method in order to study the pathway electro-oxidation of alcohols, like glycerol, 1,2-propanediol and alkaline medium. TEM images showed a good dispersion of the gold nanoparticles on the carbon support and the particle mean size ranging from 3 to 14 nm. The structure of gold is face centered cubic (fcc) indicated by XRD and the metal loading was 18% evaluated by EDS technique. Cyclic voltammetry was mainly used to evaluate the electrochemical activity of the Au NPs towards the oxidative transformation of alcohols. Electrochemical results proved that Au/C Nps are more active to oxidize glycerol than 1,2-propanediol and 1-propanol, while higher current density was obtained for the diol. In situ FTIR measurements showed different pathway for each alcohol. For glycerol electro-oxidation, the mean byproducts from reaction were formate and oxalate ions. It was already suggested that gold in alkaline medium oxidized glycerol more promptly than others alcohols. The electro-oxidation of 1,2-propanediol leaded to acetate ion and hydroxyacetone while the in situ FTIR spectrum for electrooxidation of 1-propanol suggests that propanoate is the only the product of 1-propanol electro-oxidation over Au/C. (C) 2014 Elsevier B.V. All rights reserved. (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: 08/11601-7 - Basic and applied studies of the electrooxidation of glycerol with the purpose of the development of the direct glicerol fuel cell
Grantee:Vanessa Luciane Oliveira
Support type: Scholarships in Brazil - Doctorate