(Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes
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 su...
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| Format: | Article |
| Language: | en_US |
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Electrochemical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/81861 https://orcid.org/0000-0002-2688-5666 |
| _version_ | 1826216380239708160 |
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| author | Cai, Zhuhua Yildiz, Bilge Lee, Wonyoung |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Cai, Zhuhua Yildiz, Bilge Lee, Wonyoung |
| author_sort | Cai, Zhuhua |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T16:46:23Z |
| format | Article |
| id | mit-1721.1/81861 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:46:23Z |
| publishDate | 2013 |
| publisher | Electrochemical Society |
| record_format | dspace |
| spelling | mit-1721.1/818612022-10-03T08:12:21Z (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes Cai, Zhuhua Yildiz, Bilge Lee, Wonyoung Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Cai, Zhuhua Yildiz, Bilge Lee, Wonyoung 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. United States. Dept. of Energy. Office of Fossil Energy (Grant DE-NT0004117) 2013-10-30T12:48:49Z 2013-10-30T12:48:49Z 2012-04 Article http://purl.org/eprint/type/JournalArticle 1938-6737 1938-5862 http://hdl.handle.net/1721.1/81861 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 https://orcid.org/0000-0002-2688-5666 en_US http://dx.doi.org/10.1149/1.3701331 ECS Transactions 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. application/pdf Electrochemical Society MIT Web Domain |
| spellingShingle | Cai, Zhuhua Yildiz, Bilge Lee, Wonyoung (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title | (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title_full | (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title_fullStr | (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title_full_unstemmed | (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title_short | (Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the Surface of Thin Film Cathodes |
| title_sort | invited role of chemical heterogeneities on oxygen reduction kinetics on the surface of thin film cathodes |
| url | http://hdl.handle.net/1721.1/81861 https://orcid.org/0000-0002-2688-5666 |
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