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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Electro-oxidation of ethanol on ternary Pt-Sn-Ce/C catalysts

Texto completo
Autor(es):
Jacob, Juliana M. [1] ; Corradini, Patricia G. [1] ; Antolini, Ermete [2] ; Santos, Nathalia Abe [1] ; Perez, Joelma [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Scuola Sci Mat, I-16016 Genoa - Italy
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 165, p. 176-184, APR 2015.
Citações Web of Science: 23
Resumo

Ternary Pt-Sn-Ce/C catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared to that of Pt-Sn/C, Pt-Ce/C and Pt/C catalysts. No bulk alloy formation was detected by XRD analysis. XPS measurements indicated no segregation on the catalyst surface and the presence of Sn(0) and SnOx, Ce2O3 and CeO2 oxides. The onset potential for CH3CH2OH oxidation on Pt-Sn/C and Pt-Sn-Ce/C (60:20:20) catalysts, which have the highest Sn content on the surface, was lower than that of Pt-Sn-Ce/C (70:20:10) and (50:20:30), Pt-Ce/C and Pt/C catalysts. This work highlights the dependence on the potential of the effect of cerium in Pt-Sn-Ce/C catalysts on the EOR activity and on the reaction mechanism. By derivative voltammograms, different reaction pathways at different potentials, involving Sn (at ca. 0.44V vs. RHE), Sn + Ce (at ca. 0.55V vs. RHE) and Ce (at ca. 0.67V vs. RHE) were inferred. The Pt-Sn-Ce/C catalysts were less tolerant to poisoning by ethanol oxidation intermediate species than Pt/C and Pt-Sn/C, but more stable than Pt-Ce/C catalysts. DEFC tests at 90 degrees C indicated that a higher Sn surface content is more effective for ethanol oxidation than the addition of Ce to Pt-Sn/C. (C) 2014 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 11/50727-9 - Desenvolvimento de sistemas para produção de hidrogênio e para geração e utilização de energia eletro-química
Beneficiário:Ernesto Rafael Gonzalez
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 12/12189-8 - Investigação de nanocatalisadores de platina-terras raras suportados em carbono para células a combustível de etanol direto
Beneficiário:Patricia Gon Corradini
Linha de fomento: Bolsas no Brasil - Doutorado