PtSn/C alloyed and non-alloyed materials: Differences in the ethanol electro-oxidation reaction pathways

Autor(es)

Silva, J. C. M. ^{[1, 2]} ; Parreira, L. S. ^{[1, 2]} ; De Souza, R. F. B. ^{[1, 2]} ; Calegaro, M. L. ^{[2, 3]} ; Spinace, E. V. ^{[1, 2]} ; Neto, A. O. ^{[1, 2]} ; Santos, M. C. ^{[1, 2]}

Afiliação do(s) autor(es)

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

^[2] CNEN SP, IPEN, BR-05508900 Sao Paulo - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 110, p. 141-147, NOV 2 2011.
• Citações Web of Science: 52

Resumo

In the present work, the ethanol oxidation reaction (EOR) was investigated using PtSn/C electrocatalysts in the following two phases: 92% alloyed prepared by the polymeric precursor method (PPM) and 6% alloyed prepared by a sot-gel method (SGM). The TEM experiments show particle sizes of 3-5 nm for both catalysts. The electrocatalytic activity for both materials was investigated using chronoamperometry, and at 0.5 V vs. RHE, the current density for the EOR on the PPM material was approximately 5 times higher than on the SGM material. From in situ ATR-FTIR experiments, it can be seen that the non-alloyed materials led to CO(2) formation with slow kinetics, whereas alloyed materials led to acetic acid formation with fast kinetics. The enhancement in the electrocatalytic behavior for ethanol oxidation was explained by acetic acid formation. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/09145-6 - Estudo do mecanismo de oxidação eletroquímica de etanol com eletrocatalisadores de PtSn, PtCe e PtSnCe utilizando técnicas espectroscópicas in-situ
• Beneficiário: Rodrigo Fernando Brambilla de Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/16511-6 - Nanoestruturas para a geração de energia a partir de biocombustível
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/07831-7 - Síntese e caracterização de eletrocatalisadores PtSn/C, PtIr/C e PtSnIr/C para o estudo do mecanismo da oxidação eletroquímica de etanol, utilizando-se técnicas espectroscópicas in situ
• Beneficiário: Júlio César Martins da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado