Electrocatalitic activity of platinum deposited on carbon functionalized with s...

• Autor(es): Capelo, Anabela ; Esteves, M. Alexandra ; Sá, A. I. Correia de ; Rangel, C. M.
• Data: 2013
• Identificador Persistente: http://hdl.handle.net/10400.9/2212
• Origem: Repositório do LNEG
• Assunto(s): Pt electrocatalysts; Chemically modified carbon; Sulphonic groups; Methanol Oxidation; Pt dissolution; Chloride
• Tipo de Documento: Documento de conferência
• Idioma: Inglês

Descrição

Results are presented for Pt deposited on 4-aminobenzenesulphonic acid-functionalized carbon, Pt/C_ABSA. Vulcan XC-72R was functionalized in order to influence catalyst dispersion and decrease the resistance of three phase boundary, by introducing sulphonic groups and lessening the amount of Nafion® added to the catalyst layers. Electrochemical characterization of the supported catalyst was done in a 0.5 M H2SO4 solution with added methanol or chloride demonstrating well defined features and stable voltammograms after cycling, with apparent higher currents when compared with commercial catalyst. The structure sensitive adsorption of anions on platinum is confirmed by either the blocking effect of chloride ions or methanol, evident in both anodic and cathodic features of the voltammograms. Optimal performance was found for a Nafion® concentration of 15-20 wt %.