Abstract
Carbon supported Pd nanoparticle catalysts (Pd/C) for oxygen reduction reaction (ORR) were synthesized by using the liquid-phase pyrolysis method and the impregnation method respectively. Although the Pd/C catalysts produced in liquid phase method possessed larger particle sizes, they exhibited higher activity for ORR and much better durability as compared with Pd/C prepared by the impregnation-reduction method. By galvanic displacement of the monolayer Cu formed on Pd nanoparticle surface through under potential deposition, Pt monolayer decorated Pd/C catalysts (Pt<sub>ML</sub>/Pd/C) were fabricated. The thus prepared Pt monolayer catalysts exhibited ORR activity close and durability superior to the state-of-the-art commercial Pt/C. The Pt mass activity of the PtML/Pd/C catalyst for ORR was more than 4 times higher than that given by the Pt/C, showing a great perspective of the Pt monolayer electrocatalysts in fuel cells applications.
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