Preparation of PtSnO2/C electrocatalysts using electron beam irradiation

Autor(es)

Silva, Dionisio F. ^[1] ; Geraldes, Adriana N. ^[1] ; Oliveira Neto, Almir ^[1] ; Pino, Eddy S. ^[1] ; Linardi, Marcelo ^[1] ; Spinace, Estevam V. ^[1] ; Macedo, Waldemar A. A. ^[2] ; Ardisson, Jose D. ^[2]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, BR-05508900 Sao Paulo - Brazil

^[2] CDTN, Serv Nanotecnol, BR-31270901 Belo Horizonte, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 175, n. 3, p. 261-265, DEC 15 2010.
• Citações Web of Science: 16

Resumo

PtSnO(2)/C electrocatalysts with Pt:Sn atomic ratios of 75:25, 50:50 and 25:75 were prepared in water/2-propanol using electron beam irradiation. The materials were characterized by energy-dispersive X-ray analysis, X-ray diffraction, Mossbauer spectroscopy and transmission electron microscopy. The electro-oxidation of ethanol was studied by chronoamperometry at room temperature and on direct ethanol fuel cell (DEFC) at 100 degrees C. The X-ray diffraction and Mossbauer measurements of the PtSnO(2)/C electrocatalysts showed typical face-centered cubic (fcc) structure of platinum and the presence of a SnO(2) phase (cassiterite). The PtSnO(2)/C electrocatalysts were active for ethanol electro-oxidation and the material with Pt:Sn atomic ratio of 50:50 showed the best performance. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/08724-7 - Preparação de eletrocatalisadores PtRu/C e PtSn/C utilizando feixe de elétrons para aplicação como ânodo na oxidação direta de álcoois em células a combustível.
• Beneficiário: Estevam Vitorio Spinacé
• Modalidade de apoio: Auxílio à Pesquisa - Regular