Ethanol Electro-Oxidation on PtSn/C-ATO Electrocatalysts

Autor(es)

Ayoub, J. M. S. ^[1] ; De Souza, R. F. B. ^[1] ; Silva, J. C. M. ^[2] ; Piasentin, R. M. ^[1] ; Spinace, E. V. ^[1] ; Santos, M. C. ^[2] ; Neto, A. O. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508900 Sao Paulo - Brazil

^[2] UFABC Univ Fed ABC, CCNH, LEMN, BR-09210170 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 7, n. 11, p. 11351-11362, NOV 2012.
• Citações Web of Science: 10

Resumo

PtSn/C-ATO electrocatalysts with different Pt:Sn atomic ratios (90:10, 70:30 and 50:50) were prepared in a single step by an alcohol-reduction process using H2PtCl6 center dot 6H(2)O and SnCl2 center dot 2H(2)O as metal sources and ethylene glycol as solvent and reducing agent and a physical mixture of carbon Vulcan XC72 (85 wt%) and Sb2O5 center dot SnO2 (15 wt%) as support (C-ATO). The obtained materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The catalytic activity for ethanol electro-oxidation in acid medium was investigated by cyclic voltammetry and chroamperometry and in single direct ethanol fuel cell (DEFC). XRD analyses showed that Pt(fcc), SnO2, carbon and ATO phases coexist in the obtained materials. The electrochemical studies showed that PtSn/C-ATO electrocatalysts were more active for ethanol electro-oxidation than PtSn/C electrocatalyst. The experiments at 100 degrees C on a single DEFC showed that the power density of the cell using PtSn/C-ATO (90:10) was nearly 100% higher than the one obtained using PtSn/C (50:50). FTIR measurements showed that the addition of ATO to PtSn/C favors the formation of acetic acid as a product while for PtSn/C acetaldehyde was the principal product formed. (AU)

• Processo FAPESP: 10/16511-6 - Nanoestruturas para a geração de energia a partir de biocombustível
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/18246-0 - Estudo da oxidação eletroquímica de álcoois em meio alcalino sobre eletrocatalisadores binários e ternários de PD preparados via redução por borohidreto de sódio
• Beneficiário: Almir Oliveira Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/07831-7 - Síntese e caracterização de eletrocatalisadores PtSn/C, PtIr/C e PtSnIr/C para o estudo do mecanismo da oxidação eletroquímica de etanol, utilizando-se técnicas espectroscópicas in situ
• Beneficiário: Júlio César Martins da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado