期刊
JOURNAL OF POWER SOURCES
卷 196, 期 15, 页码 6085-6091出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.03.064
关键词
Oxygen reduction; Identical locations transmission electron microscopy; Platinum; Corrosion; Fuel cell
资金
- Danish Strategic Research Council
- Danish Council for Technology and Innovation
- PSO [010076]
- Spanish Government Ministry of Education
- Danish National Research Foundation
The degradation mechanisms of Pt nanoparticles supported on Carbon have been characterized during oxygen reduction reaction (ORR) conditions using IL-TEM. A TEM grid is used as the sole working electrode allowing a direct correlation between the electrochemical response and the TEM analysis. We mainly observe a decrease in nanoparticle size with some particle disappearance and some particle sintering after potential cycling simulating the start-up and shut-down of a fuel cell. The observation of nanoparticles with reduced particle size provides evidence that dissolution phenomena are the main cause of degradation in Pt/C electrocatalysts, under ORR conditions. (C) 2011 Elsevier B.V. All rights reserved.
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