Abstract
Carbon-supported Pd, Pt, Pt1Pd1, and Pt3Pd1 electrocatalysts were prepared by metal ion chemical reduction with borohydride. The electrocatalysts were analyzed by EDS, HRTEM, and XRD techniques. The EDS spectra showed that the actual compositions of the materials were close to the nominal compositions. The XRD measurements revealed that the materials were crystalline, and no oxide peaks were observed. The HRTEM micrographs showed homogeneous particle distributions on the carbon, with Gaussian particle size distributions. The mean particle sizes were taken as the maxima of the Gaussian distributions. All the materials presented electrochemical activities for the ethanol oxidation reaction, with the exception of Pd in acid media. Pt showed poor performance in alkaline media. The poisoning rate was determined by cyclic voltammetry (i forward/i backward ratios), as well as by chronoamperometry experiments, both of which indicated a low poisoning rate for Pd in alkaline medium and higher poisoning rates as the Pt content increased in the PtPd electrocatalyst
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