Size Influence on the Oxygen Reduction Reaction Activity and Instability of Supported Pt Nanoparticles
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Shao-Horn_Size influence.pdf
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Author(s)
Sheng, Wenchao
Chen, Shuo
Vescovo, Elio
Shao-Horn, Yang
Date Issued
December 2011
Journal
Journal of The Electrochemical Society
Publisher
Electrochemical Society
Citation
Sheng, Wenchao, Shuo Chen, Elio Vescovo, and Yang Shao-Horn. Size Influence on the Oxygen Reduction Reaction Activity and Instability of Supported Pt Nanoparticles. Journal of The Electrochemical Society 159, no. 2 (2012): B96.
Version
Final published version
Abstract
Size-dependent oxygen reduction reaction activity (ORR) and instability of Pt nanoparticles is of great importance in proton exchange membrane fuel cell applications. In this study, the size-dependence of ORR activity on Pt nanoparticles (NPs) was investigated on high-surface-area carbon supported Pt NPs below 5 nm in acidic electrolytes using rotating disk electrode method. The ORR activity was correlated to the estimated surface coverage by OH anion from cyclic voltammogram measurements and the surface composition and electronic structure of Pt NPs, which was studied using X-ray photoemission spectroscopy, and ultraviolet photoemission spectroscopy. The results revealed a size-independent ORR activity on Pt NPs below 5 nm, which was attributed to similar surface compositions and surface electronic structures of Pt NPs below 5 nm as well as comparable OH anion coverage at the potential where ORR was evaluated. In contrast, the instability of Pt NPs under accelerated potential cycling was found to be strongly dependent on the particle size.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1149/2.009202jes
