Pt-Ru-TiO2 photoelectrocatalysts for methanol oxidation

Autor(es)

Polo, Andre S. ; Santos, M. C. ; de Souza, Rodrigo F. B. ; Alves, Wendel A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 196, n. 2, p. 5-pg., 2011-01-15.

Resumo

Novel photoelectrocatalysts composed of PtRuTiO2/C are prepared by the polymeric precursor method and are characterized by scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy and cyclic voltammetry. The onset potential for methanol oxidation is similar (0.3 V vs. RHE) for all of the photoelectrocatalyst layers investigated, although the peak current density is dependent on the layer composition. Irradiation of UV light on the photoelectrocatalyst surfaces enhances the chronoamperometric responses up to 18%, which clearly demonstrates a synergistic effect between the photo- and electrocatalysts. The comparison between all the layers prepared indicates that there is an appropriate ratio of metallic nanoparticles and TiO2 to obtain the best performance of these phoroelectroactive layers. These results demonstrate that methanol oxidation is achieved by electro- and photocatalysis using a simple and affordable method. This procedure can be conveniently exploited to enhance the response of direct methanol fuel cell electrodes. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/53576-9 - Síntese, caracterização e estudo das propriedades eletrônicas dos nanotubos de peptídeos e óxido de titânio
• Beneficiário: Wendel Andrade Alves
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 05/59992-6 - Materiais nanoestruturados: eletrocatálise e membranas de óxidos
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• 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