Cu-Pd/C Electrocatalyst with Low Pd Content toward Methanol Electro-Oxidation

Wednesday, 8 October 2014: 09:20
Sunrise, 2nd Floor, Jupiter 1 & 2 (Moon Palace Resort)
J. A. Maya-Cornejo, N. Arjona (Centro de Investigación y Desarrollo Tecnológico en Electroquímica), M. Guerra-Balcázar (División de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro), L. Álvarez-Contreras (Centro de Investigación en Materiales Avanzados S.C.), J. Ledesma García (Universidad Autónoma de Queretaro), and L. G. Arriaga (Centro de Investigación y Desarrollo Tecnológico en Electroquímica)
Cu-Pd/C electrocatalyst was synthesized by chemical reduction method from CuSO4 and K2PdCl4 as metallic precursors in the presence of polyvinylpyrrolidone as surfactant and ascorbic acid as reducing agent. The morphology, composition and electrocatalytic properties were investigated by X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Transmission Electron Microscopy (TEM), cyclic voltammetry, and chronoamperometry techniques. The electrocatalyst were obtained with homogeneous distribution, average particle size around 5 nm and low percent of Pd (Pd 35%, Cu 65% according to XRF and EDS results) for a catalyst with 70-30 composition. XRD patterns show the typical faced-centered cubic structure, where the (111) plane exhibited a slightly shift. The electrocatalytic activity of Cu-Pd/C was evaluated in terms of methanol electro-oxidation at three concentrations (0.1, 0.3 and 0.5M) in KOH aqueous solution. The results obtained from voltamperometric studies showed that the current density achieved with Cu-Pd/C electrocatalyst is 3 times higher than that reached with commercial Pd (30% from ETEK) and a shift to negative values for electro-oxidation potential.