Electro-oxidation of ethanol on ternary non-alloyed Pt-Sn-Pr/C catalysts

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 Carlos, SP - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 275, p. 377-383, FEB 1 2015.
• Citações Web of Science: 14

Resumo

Ternary Pt-Sn-Pr/C (70:10:20), (70:15:15) and (45:45:10) electro-catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared with that of Pt-Pr/C catalysts prepared by the same methods and that of commercial Pt-Sn/C (75:25) and Pt/C catalysts. Among all the catalysts, the Pt-Sn-Pr/C (45:45:10) catalyst presented both the highest mass activity and the highest specific activity. The steady state electrochemical stability of ternary Pt-Sn-Pr catalysts increased with the surface Sn/Pt atomic ratio. Following repetitive potential cycling (RPC), the activity for ethanol oxidation of Pt-Sn-Pr/C catalysts with high surface Sn/Pt atomic ratio was considerably higher than that of the corresponding as-prepared catalysts, and increased with increasing the Sn/Pt ratio. The increase of the EOR mass activity following RPC was ascribed to the increase of either the specific activity (for the Pt-Sn-Pr/C (70:15:15) catalyst) or the electrochemically active surface area (for the Pt-Sn-Pr/C (45:45:10) catalyst). Dissolution of Sn and Pr oxides from Pt-Sn-Pr/C catalyst surface was observed following RPC. (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
• Modalidade de apoio: 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
• Modalidade de apoio: Bolsas no Brasil - Doutorado