Ethanol oxidation reaction on PtCeO2/C electrocatalysts prepared by the polymeric precursor method

Autor(es)

De Souza, R. F. B. ^[1] ; Flausino, A. E. A. ^[1] ; Rascio, D. C. ^[1] ; Oliveira, R. T. S. ^{[1, 2]} ; Teixeira Neto, E. ^[1] ; Calegaro, M. L. ^[3] ; Santos, M. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Abc, CCNH, LEMN, BR-09210170 Santo Andre, SP - Brazil

^[2] Fac Ciencias Exatas & Sociais Aplicadas, BR-39100000 Diamantina, MG - Brazil

^[3] Univ Sao Paulo, Inst Quim, Grp Mat Eletroquim & Metodos Eletroanalit, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 91, n. 1-2, p. 516-523, SEP 7 2009.
• Citações Web of Science: 49

Resumo

This paper presents a study of the electrocatalysis of ethanol oxidation reactions in an acidic medium on Pt-CeO(2)/C (20 wt.% of Pt-CeO(2) on carbon XC-72R), prepared in different mass ratios by the polymeric precursor method. The mass ratios between Pt and CeO(2) (3:1, 2:1, 1:1, 1:2, 1:3) were confirmed by Energy Dispersive X-ray Analysis (EDAX). X-ray diffraction (XRD) structural characterization data shows that the Pt-CeO(2)/C catalysts are composed of nanosized polycrystalline non-alloyed deposits, from which reflections corresponding to the fcc (Pt) and fluorite (CeO(2)) structures were clearly observed. The mean crystallite sizes calculated from XRD data revealed that, independent of the mass ratio, a value close to 3 nm was obtained for the CeO(2) particles. For Pt, the mean crystallite sizes were dependent on the ratio of this metal in the catalysts. Low platinum ratios resulted in small crystallites. and high Pt proportions resulted in larger crystallites. The size distributions of the catalysts particles, determined by XRD, were confirmed by Transmission Electron Microscope (TEM) imaging. Cyclic voltammetry and chronoamperometic experiments were used to evaluate the electrocatalytic performance of the different materials. In all cases, except Pt-CeO(2)/C 1:1, the Pt-Ceo(2)/C catalysts exhibited improved performance when compared with Pt/C. The best result was obtained for the Pt-CeO(2)/C 1:3 catalyst, which gave better results than the Pt-Ru/C (Etek) catalyst. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• 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