Activity, short-term stability (poisoning tolerance) and durability of carbon supported Pt-Pr catalysts for ethanol oxidation

Autor(es)

Corradini, Patricia G. ^[1] ; Antolini, Ermete ^[2] ; Perez, Joelma ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Paulo - Brazil

^[2] Scuola Sci Mat, I-16016 Genoa - Italy

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 251, p. 402-410, APR 1 2014.
• Citações Web of Science: 10

Resumo

Pt-Pr/C electrocatalysts were prepared by a modified formic acid method, and their activity for carbon monoxide and ethanol oxidation, their short term stability and durability were compared to that of commercial Pt/C and Pt-Sn/C (3:1) catalysts. By derivative voltammetry (DV) it was found that ethanol electro-oxidation takes place by two main pathways at different potentials. It was observed that, in the presence of Pr, ethanol electro-oxidation takes place mostly through the pathway at lower potential, which is the most interesting for fuel cell application. The Pt-Pr/C catalysts were less tolerant to poisoning by ethanol oxidation intermediate species than Pt/C. Durability test by a repetitive potential cycling under Ar atmosphere revealed a good structural stability of Pt-Pr/C catalysts. A repetitive potential cycling under CO atmosphere carried out on the Pt-Pr/C (1:1) catalyst, instead, indicated a structural change, likely by formation of a core shell structure. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• 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
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/20045-0 - Células a combustível: contribuições ao desenvolvimento de catalisadores e ao entendimento dos problemas de aumento de escala
• Beneficiário: Joelma Perez
• Modalidade de apoio: Auxílio à Pesquisa - Regular