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The electrocatalytic activity of Pt 3 Ru 2 /C nanocatalyst toward the electro-oxidation of bulk CO was examined in acid and alkaline solution at ambient temperature using the thin-film, rotating disk electrode (RDE) method. The catalyst was characterized by XRD analysis. The XRD pattern revealed that the Pt 3 Ru 2 /C catalyst consisted of two structures, i.e., Pt-Ru-fcc and Ru-hcp (a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru). Electrocatalytic activities were measured by applying potentiodynamic and steady state techniques. The oxidation of CO on the Pt 3 Ru 2 /C catalyst was influenced by pH and anions from the supporting electrolytes. The Pt 3 Ru 2 /C was more active in alkaline than in acid solution, as well as in perchloric than in sulfuric acid. Comparison of CO oxidation on Pt 3 Ru 2 /C and Pt/C revealed that the Pt 3 Ru 2 /C was more active than Pt/C in acid solution, while both catalysts had a similar activity in alkaline solution.

Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation