Pt-decorated Pd/C Catalysts for Methanol-tolerance Oxygen Reduction Reaction

摘要

The Pt-decorated Pd/C catalysts were prepared by two consecutive steps, synthesizing Pd/C catalyst and then decoration of Pt via a polyol reduction. It is believed that Pt was deposited onto the Pd surface through conformal epitaxial growth. A series of Pt-decorated Pd/C catalysts were characterized by XRD, TEM and electrochemical methods. The CO stripping voltammograms of the Pt-decorated Pd/C catalysts exhibit two CO oxidation peaks, indicative of two active sites for CO oxidation. An activity evaluation of the oxygen reduction reaction (ORR) on as-prepared Pt-decorated Pd/C catalysts with a rotating disk electrode (RDE) technique revealed that the maximum ORR mass activity was observed for a Pd:Pt atomic ratio of 7:1, and meanwhile bimetallic catalysts exhibited good methanol tolerance during the ORR.