A comparative investigation of metal-support interactions on the catalytic activity of Pt nanoparticles for ethanol oxidation in alkaline medium

Autor(es)

Godoi, Denis R. M. ^[1] ; Villullas, Hebe M. ^[1] ; Zhu, Fu-Chun ^[2] ; Jiang, Yan-Xia ^[2] ; Sun, Shi-Gang ^[2] ; Guo, Junsong ^[3] ; Sun, Lili ^[3] ; Chen, Rongrong ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Inst Quim, BR-14800 Araraquara, SP - Brazil

^[2] Xiamen Univ, Sch Energy Res, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Dept Chem, Xiamen 361005 - Peoples R China

^[3] Indiana Univ Purdue Univ, Richard G Lugar Ctr Renewable Energy, Indianapolis, IN 46202 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 311, p. 81-90, APR 15 2016.
• Citações Web of Science: 23

Resumo

The effects of interactions of Pt nanoparticles with hybrid supports on reactivity towards ethanol oxidation in alkaline solution are investigated. Studies involve catalysts with identical Pt nanoparticles on six hybrid supports containing carbon powder and transition metal oxides (TiO2, ZrO2, SnO2, CeO2, MoO3 and WO3). In situ X-ray absorption spectroscopy (XAS) results evidence that metal-support interactions produce changes in the Pt 5d band vacancy, which appears to determine the catalytic activity. The highest and lowest activities are observed for Pt nanoparticles on hybrid supports containing TiO2 and CeO2, respectively. Further studies are presented for these two catalysts. In situ FTIR reflection spectroscopy measurements, taken using both multi-stepped FTIR spectroscopy (MS-FTIR) and single potential alteration FTIR spectroscopy (SPA-FTIR), evidence that the main product of ethanol oxidation is acetate, although signals attributed to carbonate and CO2 indicate some differences in CO2 production. Fuel cell performances of these catalysts, tested in a 4.5 cm(2) single cell at different temperatures (40-90 degrees C) show good agreement with data obtained by electrochemical techniques. Results of this comprehensive study point out the possibility of compensating a reduction of noble metal load with an increase in activity promoted by interactions between metallic nanoparticles and a support. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/50206-4 - Desenvolvimento de catalisadores multifuncionais para substituir a Pt para reações de oxidação de combustíveis em células a combustível de baixa temperatura visando produção de energia ambientalmente adequada
• Beneficiário: Hebe de las Mercedes Villullas
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 14/12255-6 - Relações catálise-nanoestrutura-propriedades e estudos dos mecanismos de reação: estabelecendo bases para o desenho de catalisadores multifuncionais
• Beneficiário: Hebe de las Mercedes Villullas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/01822-4 - Estudo mecanístico das reações de oxidação de metanol e etanol sobre platina suportada em nanocompósitos carbono-óxido de metal de transição
• Beneficiário: Denis Ricardo Martins de Godoi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado