resumo
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.
palavras-chave
SINGLE-CRYSTAL SURFACES; ZERO TOTAL CHARGE; ACID-SOLUTIONS; BIMETALLIC COLLOIDS; ANION ADSORPTION; STEPPED SURFACES; PLATINUM; NANOPARTICLES; CATALYSIS; PT(111)
categoria
Chemistry; Electrochemistry
autores
Jeon, TY; Pinna, N; Yoo, SJ; Yu, SH; Kim, SK; Lim, S; Peck, D; Jung, DH; Sung, YE
nossos autores
Nicola Pinna
InvestigadorGrupos
agradecimentos
This work was support by the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science & Technology (MEST) (NRF-C1AAA001-2010-0029065) and WCU (World Class University) Program (R31-10013). TYJ acknowledges New & Renewable Energy R&D Program (2008NFC08P030000) under the Ministry of Knowledge Economy.