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Platinum-Gold Nanoparticles: A Highly Active Bifunctional Electrocatalyst for Rechargeable Lithium-Air Batteries

Author(s)
Lu, Yi-Chun; Xu, Zhichuan; Gasteiger, Hubert A.; Chen, Shuo; Hamad-Schifferli, Kimberly; Shao-Horn, Yang; ... Show more Show less
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Abstract
PtAu nanoparticles (NPs) were shown to strongly enhance the kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable Li−O2 cells. Li−O2 cells with PtAu/C were found to exhibit the highest round-trip efficiency reported to date. During ORR via xLi+ + O2 + xe− → LixO2, the discharge voltage with PtAu/C was considerably higher than that of pure carbon and comparable to that of Au/C. During OER via LixO2 → xLi+ + O2 + xe−, the charge voltages with PtAu/C fell in the range from 3.4 to 3.8 VLi, which is slightly lower than obtained with Pt. It is hypothesized that PtAu NPs exhibit bifunctional catalytic activity, having surface Au and Pt atoms primarily responsible for ORR and OER kinetics in Li−O2 cells, respectively.
Date issued
2010-06
URI
http://hdl.handle.net/1721.1/65124
Department
Massachusetts Institute of Technology. Department of Biological Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Journal of the Americal Chemical Society
Publisher
American Chemical Society
Citation
Lu, Yi-Chun et al. “Platinum−Gold Nanoparticles: A Highly Active Bifunctional Electrocatalyst for Rechargeable Lithium−Air Batteries.” Journal of the American Chemical Society 132.35 (2010) : 12170-12171.
Version: Author's final manuscript
ISSN
0002-7863
1520-5126

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