Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
 
Carbon-Supported Palladium Sub-Nanometer Particle Catalyst for Oxygen Reduction Reaction in Acid Media
Jun Ho ShimHyun Jung JungYoungmi LeeChongmok Lee
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2011 Volume 84 Issue 11 Pages 1276-1282

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Abstract

Pd nanoparticles (Pd NPs) on a carbon support (Pd/C) were synthesized in ethylene glycol containing poly(1-vinyl-2-pyrrolidone) (PVP) at various PVP/Pd precursor ratios. The sizes of the Pd NPs were controlled by varying the PVP concentration. Smaller Pd NPs were obtained at higher PVP concentrations. Indeed, the mean sizes of the Pd NPs with PVP/Pd precursor ratios of 0, 40, and 80 (Pd/C-0, -40, and -80) were 2.8 (±1.2), 1.5 (±0.3), and 0.8 (±0.3) nm, respectively, by TEM analysis. The electrocatalytic activities of the Pd/C catalysts toward the oxygen reduction reaction (ORR) were examined in a 0.1 M HClO4 solution using rotating disk electrode voltammetry. The smaller Pd NPs exhibited more efficient ORR properties, such as a more positive ORR onset potential (or half-wave potential, E1/2) and increased number of electrons (n) transferred in the ORR. In particular, the Pd/C-80 catalyst with a lower metal content (7.9 wt % Pd) showed desirable ORR performance in terms of the onset potential, n value, mass activity, and methanol tolerance.

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© 2011 The Chemical Society of Japan
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