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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Electro-Oxidation of Formic Acid on PdIr/C-Sb2O5 center dot SnO2 Electrocatalysts Prepared by Borohydride Reduction

Autor(es):
Nandenha, J. [1] ; De Souza, R. F. B. [1] ; Assumpcao, M. H. M. T. [1] ; Spinace, E. V. [1] ; Neto, A. O. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Inst Pesquisas Energet & Nucl IPEN CNEN SP, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: International Journal of Electrochemical Science; v. 8, n. 7, p. 9171-9179, JUL 2013.
Citações Web of Science: 4
Resumo

PdIr/C-Sb2O5 center dot SnO2 electrocatalysts with different atomic ratio (90:10, 70:30 and 50:50) were prepared by borohydride reduction method using a water/2-propanol mixture as solvent, Pd(NO3)(2)center dot 2H(2)O and IrCl3 center dot 3H(2)O as metal sources, a physical mixture of 85% Vulcan Carbon XC72 and 15% Sb2O5 center dot SnO2 (ATO) as support and NaBH4 as reducing agent. The obtained materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), while the catalytic activity for formic acidic electro-oxidation was investigated by cyclic voltammetry and chronoamperometry. X-ray diffractograms of PdIr/C-Sb2O5 center dot SnO2 electrocatalysts showed the presence of Pd(fcc) phase, carbon and ATO phases. These electrocatalysts did not show peaks related to Ir, however the presence of Ir oxides in small amounts and amorphous forms cannot be discarded. TEM micrographs and histograms of the particle size distributions showed that the nanoparticles of PdIr electrocatalysts where not well dispersed on the support and some agglomerates were present. The electrochemical studies showed that PdIr/C-Sb2O5 center dot SnO2 (90:10) and PdIr/C-Sb2O5 center dot SnO2 (50:50) had superior performance for formic acid electro-oxidation at 25 degrees C compared to Pd/C-Sb2O5 center dot SnO2. These result indicated that addition of Ir to Pd could favor the electro-oxidation of formic acid, therefore this effect could be attributed to bifunctional mechanism associated to electronic effect. (AU)

Processo FAPESP: 12/03516-5 - Eletrocatalisadores suportados em óxidos-c para uso em ânodos de célula à combustível de líquido direto
Beneficiário:Rodrigo Fernando Brambilla de Souza
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 11/18246-0 - Estudo da oxidação eletroquímica de álcoois em meio alcalino sobre eletrocatalisadores binários e ternários de PD preparados via redução por borohidreto de sódio
Beneficiário:Almir Oliveira Neto
Linha de fomento: Auxílio à Pesquisa - Regular