Enhanced activity of Pt-based electrocatalysts for oxygen reduction via a selective Pt deposition process

Title
Enhanced activity of Pt-based electrocatalysts for oxygen reduction via a selective Pt deposition process
Authors
전태열Nicola Pinn유성종유승호김상경임상엽백동현정두환성영은
Keywords
Pt nanoparticle; Oxygen reduction reaction; Surface defect; Electrocatalyst
Issue Date
2011-11
Publisher
Journal of electroanalytical chemistry
Citation
VOL 662, NO 1, 70-79
Abstract
Carbon-supported Pt nanoparticles with various loading of Pt are prepared by a novel seed-mediated growth method using hydroquinone (HQ) assisted selective deposition. The structural and morphological dependence of the Pt nanoparticles on the catalytic activity in oxygen reduction reaction (ORR) is investigated. The analysis of core-level X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) cannot elucidate the origin of the large enhancement of the ORR activity. In contrast, electrochemical measurements of the CO-displacement charge and the concomitant CO adlayer oxidation behavior prove that the selective deposition of additional Pt contributed to the decrease of surface defects and to the increase of the onset potential for OH adsorption.
URI
http://pubs.kist.re.kr/handle/201004/39575
ISSN
1572-6657
Appears in Collections:
KIST Publication > Article
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