Electrocatalytic properties of Pd clusters on Au nanoparticles in formic acid electro-oxidation

Title
Electrocatalytic properties of Pd clusters on Au nanoparticles in formic acid electro-oxidation
Authors
박인수이국승유성종최종호성영은
Keywords
Formic Acid Fuel Cell; Palladium; Gold; Core-shell; nanoparticle
Issue Date
2010-03
Publisher
Electrochimica acta
Citation
VOL 55, NO 14, 4339-4345
Abstract
Pd clusters were formed on highly dispersed Au nanoparticles (∼3.5nm in diameter) using a seedmediated growth process. The structural information and electrocatalytic activities of these Pd clusters on Au nanoparticles were confirmed by high-resolution-transmission-electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). The resulting nanoparticles, which had a uniform size (<5nm in diameter), were highly dispersed on carbon particles, and Pd clusters (<0.44nm in size, <2 atomic layers) were formed selectively on Au nanoparticles. XPS results show that the Pd 3d5/2 peak shifted to lower binding energies and that the amount of surface oxide decreased as the Pd content was decreased on the Au nanoparticles. In formic acid electro-oxidation, these Pd clusters exhibit enhanced electrocatalytic activity relative to that of carbon-supported Pd nanoparticles. These results may be due to the modified electronic and geometric structure of the Pd clusters on the Au nanoparticle substrate.
URI
http://pubs.kist.re.kr/handle/201004/37678
ISSN
0013-4686
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KIST Publication > Article
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