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Title: Electrochemical oxidation of the carbon support to synthesize Pt(Cu) and Pt-Ru(Cu) core-shell electrocatalysts for low-temperature fuel cells
Author: Caballero-Manrique, Griselda
Brillas, Enric
Centellas Masuet, Francesc A.
Garrido Ponce, José Antonio
Rodríguez González, Rosa Ma.
Cabot Julià, Pere-Lluís
Keywords: Oxidació electroquímica
Electrolytic oxidation
Issue Date: 30-Apr-2015
Publisher: MDPI
Abstract: Pt and Pt-Ru shells on Cu cores supported on Vulcan carbon XC72R have been synthesized and tested as possible anode electrocatalysts for polymer electrolyte fuel cells. Pt(Cu)/C was prepared by Cu electrodeposition on the black carbon support at constant potential followed by Pt deposition on Cu by galvanic exchange, whereas Pt-Ru(Cu)/C was prepared by spontaneous deposition of Ru species on Pt(Cu)/C. The corresponding cyclic voltammograms in 0.5 M H2SO4 solution showed the hydrogen adsorption/desorption peaks and no Cu oxidation. The respective CO stripping peak potentials of Pt(Cu)/C and Pt-Ru(Cu)/C were about 0.1 and 0.2 V more negative than those corresponding to Pt/C and Ru-decorated Pt/C. The best conditions for CO oxidation were found for Cu deposition potentials between -0.2 and -0.4 V vs Ag/AgCl/KCl(sat). The Pt economy of the Pt-Ru(Cu)/C system was proved for the methanol oxidation, with specific currents more than twice those obtained on the Ru-decorated commercial Pt/C catalysts.
Note: Reproducció del document publicat a:
It is part of: Catalysts, 2015, vol. 5, num. 2, p. 815-837
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ISSN: 2073-4344
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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