Study of ethanol electro-oxidation in acid environment on Pt3Sn/C anode catalysts prepared by a modified polymeric precursor method under controlled synthesis conditions

Autor(es)

De Souza, R. F. B. ; Parreira, L. S. ; Rascio, D. C. ; Silva, J. C. M. ; Teixeira-Neto, E. ; Calegaro, M. L. ; Spinace, E. V. ; Neto, A. O. ; Santos, M. C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 195, n. 6, p. 5-pg., 2010-03-15.

Resumo

A carbon-supported binary Pt3Sn catalyst has been prepared using a modified polymeric precursor method under controlled synthesis conditions This material was characterized using X-ray diffraction (XRD). and the results indicate that 23% (of a possible 25%) of Sn is alloyed with Pt, forming a dominant Pt3Sn phase. Transmission election microscopy (TEM) shows good dispersion of the electrocatalyst and small particle sizes (3 6 nm +/- 1 nm) The polarization curves for a direct ethanol fuel cell using Pt3Sn/C as the anode demonstrated Improved performance compared to that of a PtSn/C E-TEK. especially in the intrinsic resistance-controlled and mass transfer regions. This behavior is probably associated with the Pt3Sn phase. The maximum power density for the Pt3Sn/C electrocatalyst (58 mW cm(-2)) is nearly twice that of a PtSn/C E-TEK electrocatalyst (33 mW cm(-2)) This behavior is attributed to the presence of a mixed Pt9Sn and Pt3Sn alloy phase in the commercial catalysts (C) 2009 Elsevier B V All rights reserved (AU)

• Processo FAPESP: 08/58788-4 - Eletrocatálise das reações de oxidação de metanol e etanol utilizando-se nanomateriais baseados em ligas metálicas de PtSn
• Beneficiário: Luanna Silveira Parreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 05/59992-6 - Materiais nanoestruturados: eletrocatálise e membranas de óxidos
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 08/58789-0 - Eletrocatalise da reação de redução de oxigênio utilizando-se catalisadores binários baseados em Pt
• Beneficiário: Daniel Campana Rascio
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica