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Carbon-supported palladium sub-nanometer particle catalyst for oxygen reduction reaction in acid media

Title
Carbon-supported palladium sub-nanometer particle catalyst for oxygen reduction reaction in acid media
Authors
Shim J.H.Jung H.J.Lee Y.Lee C.
Ewha Authors
이종목이영미심준호
SCOPUS Author ID
이종목scopus; 이영미scopus
Issue Date
2011
Journal Title
Bulletin of the Chemical Society of Japan
ISSN
0009-2673JCR Link
Citation
vol. 84, no. 11, pp. 1276 - 1282
Indexed
SCI; SCIE; SCOPUS WOS scopus
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 0.1M 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. © 2011 The Chemical Society of Japan.
DOI
10.1246/bcsj.20110206
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자연과학대학 > 화학·나노과학전공 > Journal papers
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