Formic Acid Oxidation at Pd, Pt and PbOx-based Catalysts and Calculation of their Approximate Electrochemical Active Areas

Autor(es)

Niquirilo, Rafael V. ^[1] ; Teixeira-Neto, Erico ^[1] ; Buzzo, Guilherme S. ^[1] ; Suffredini, Hugo B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 5, n. 3, p. 344-354, MAR 2010.
• Citações Web of Science: 20

Resumo

In this work, we describe the use of several Pd-based catalysts for promotion of the oxidation of formic acid in the presence of sulphuric acid. We also undertake and discuss a calculation of the ``electrochemical area{''} of the carbon-supported catalysts, by using a polycrystalline Pt electrode and a Fe(CN)(6)(3-)/Fe(CN)(6)(4-) solution. All catalysts were synthesized by a modified sol-gel method. XRD spectra revealed that the Pd/C catalyst particles were a mixture of Pd and PdO crystallites. Particles of the Pd-Pt/C catalyst were composed mainly of a mixture of Pd, Pt or PdPt crystallites. The Pd-Pt-PbO(x)/C particles were a mixture of crystallites of Pd, Pt (or PdPt), PdO and lead oxides. Examination of their electrochemical responses showed that the Pd-Pt-PbO(x)/C catalysts are well suited to promote formic acid oxidation, as they avoid strong ion adsorption processes on the electrode surfaces, a problem commonly observed when using Pd/C catalysts. (AU)

• Processo FAPESP: 07/05155-1 - Catalisadores heterogêneos preparados pelo método sol-gel e sua utilização em células a combustível e na síntese de biodiesel
• Beneficiário: Hugo Barbosa Suffredini
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores