(Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes
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Author(s)
Cai, Zhuhua
Yildiz, Bilge
Lee, Wonyoung
Alternative Title
Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes
Date Issued
April 2012
Journal
ECS Transactions
Publisher
Electrochemical Society
Citation
Lee, W., Z. Cai, and B. Yildiz. “(Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes.” ECS Transactions 45, no. 1 (April 27, 2012): 405-412. © 2012 ECS - The Electrochemical Society
Version
Final published version
Abstract
We investigated the effects of annealing and A-site stoichiometry on the surface heterostructures at (La0.8Sr0.2)yMnO3 (LSM, y≤1) dense thin films. While annealing at high temperatures induces cation segregation on LSM, A-site deficiency is hypothesized to reduce the level of Sr enrichment on the surface by providing more space in the bulk of LSM for this relatively large cation. Localized chemical analysis by Auger electron spectroscopy revealed the strong enrichment of Sr and Zr in annealing-induced particles on LSM surfaces. By systematically varying y from 1.0 to 0.95, A-site deficiency in LSM films was shown to suppress Sr segregation and decrease the density of these secondary phases on annealed LSM surfaces, suggesting a higher chemical stability of LSM surfaces with A-site deficiency. Our results contribute to understanding the elastic energy contributions to cation segregation on perovskite cathode surfaces, and to elucidating the role of surface chemical heterogeneities to the ORR kinetics.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and 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/10.1149/1.3701331
