Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 662, Issue 1, Pages 70-79Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.03.023
Keywords
Pt nanoparticle; Oxygen reduction reaction; Surface defect; Electrocatalyst
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science & Technology (MEST) [NRF-C1AAA001-2010-0029065]
- WCU (World Class University) [R31-10013]
- Ministry of Knowledge Economy [2008NFC08P030000]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2008NFC08P030000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0029070, 2011-56529, R31-2011-000-10013-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2011 Elsevier B.V. All rights reserved.
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