| Texto completo | |
| Autor(es): |
Bott-Neto, Jose L.
;
Garcia, Amanda C.
;
Oliveira, Vanessa L.
;
de Souza, Nyccolas E.
;
Tremiliosi-Filho, Germano
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 735, p. 6-pg., 2014-12-01. |
| Resumo | |
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 1-propanol.in 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) | |
| Processo FAPESP: | 12/10856-7 - Investigação do mecanismo de eletro-oxidação do glicerol em nanopartículas metálicas |
| Beneficiário: | Amanda Cristina Garcia |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 08/11601-7 - Estudos básicos e aplicados da eletro-oxidação do glicerol com o propósito de desenvolver a célula à combustível direta de glicerol. |
| Beneficiário: | Vanessa Luciane Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |