Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films
Heterostructured oxides have shown unusual electrochemical properties including enhanced catalytic activity, ion transport, and stability. In particular, it has been shown recently that the activity of oxygen electrocatalysis on the Ruddlesden–Popper/perovskite (La[subscript 1-y]Sr[subscript y])[sub...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Chemical Society (ACS)
2015
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| Online Access: | http://hdl.handle.net/1721.1/97718 https://orcid.org/0000-0003-2477-6412 https://orcid.org/0000-0003-1560-0749 |
| _version_ | 1826190500501127168 |
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| author | Feng, Zhenxing Yacoby, Yizhak Gadre, Milind J. Lee, Yueh-Lin Zhou, Hua Biegalski, Michael D. Christen, Hans M. Adler, Stuart B. Morgan, Dane Shao-Horn, Yang Hong, Wesley Terrence |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Feng, Zhenxing Yacoby, Yizhak Gadre, Milind J. Lee, Yueh-Lin Zhou, Hua Biegalski, Michael D. Christen, Hans M. Adler, Stuart B. Morgan, Dane Shao-Horn, Yang Hong, Wesley Terrence |
| author_sort | Feng, Zhenxing |
| collection | MIT |
| description | Heterostructured oxides have shown unusual electrochemical properties including enhanced catalytic activity, ion transport, and stability. In particular, it has been shown recently that the activity of oxygen electrocatalysis on the Ruddlesden–Popper/perovskite (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1–x]Sr[subscript x]CoO[subscript 3−δ] heterostructure is remarkably enhanced relative to the Ruddlesden–Popper and perovskite constituents. Here we report the first atomic-scale structure and composition of (La[subscript 1–y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1–x]Sr[subscript x]CoO[subscript 3−δ] grown on SrTiO[subscript 3]. We observe anomalous strontium segregation from the perovskite to the interface and the Ruddlesden–Popper phase using direct X-ray methods as well as with ab initio calculations. Such Sr segregation occurred during the film growth, and no significant changes were found upon subsequent annealing in O[subscript 2]. Our findings provide insights into the design of highly active catalysts for oxygen electrocatalysis. |
| first_indexed | 2024-09-23T08:41:12Z |
| format | Article |
| id | mit-1721.1/97718 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:41:12Z |
| publishDate | 2015 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/977182022-09-23T13:50:05Z Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films Feng, Zhenxing Yacoby, Yizhak Gadre, Milind J. Lee, Yueh-Lin Zhou, Hua Biegalski, Michael D. Christen, Hans M. Adler, Stuart B. Morgan, Dane Shao-Horn, Yang Hong, Wesley Terrence Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Electrochemical Energy Laboratory Massachusetts Institute of Technology. Research Laboratory of Electronics Feng, Zhenxing Lee, Yueh-Lin Hong, Wesley Terrence Shao-Horn, Yang Heterostructured oxides have shown unusual electrochemical properties including enhanced catalytic activity, ion transport, and stability. In particular, it has been shown recently that the activity of oxygen electrocatalysis on the Ruddlesden–Popper/perovskite (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1–x]Sr[subscript x]CoO[subscript 3−δ] heterostructure is remarkably enhanced relative to the Ruddlesden–Popper and perovskite constituents. Here we report the first atomic-scale structure and composition of (La[subscript 1–y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1–x]Sr[subscript x]CoO[subscript 3−δ] grown on SrTiO[subscript 3]. We observe anomalous strontium segregation from the perovskite to the interface and the Ruddlesden–Popper phase using direct X-ray methods as well as with ab initio calculations. Such Sr segregation occurred during the film growth, and no significant changes were found upon subsequent annealing in O[subscript 2]. Our findings provide insights into the design of highly active catalysts for oxygen electrocatalysis. United States. Dept. of Energy (SISGR DESC0002633) King Abdullah University of Science and Technology Center for Clean Water and Clean Energy at MIT and KFUPM Israel Science Foundation (Grant 1005/11) United States. Dept. of Energy. National Energy Technology Laboratory. Solid State Energy Conversion Alliance Core Technology Program (Funding Opportunity DEFE0009435) 2015-07-13T14:03:02Z 2015-07-13T14:03:02Z 2014-03 2014-02 Article http://purl.org/eprint/type/JournalArticle 1948-7185 http://hdl.handle.net/1721.1/97718 Feng, Zhenxing, Yizhak Yacoby, Milind J. Gadre, Yueh-Lin Lee, Wesley T. Hong, Hua Zhou, Michael D. Biegalski, et al. “Anomalous Interface and Surface Strontium Segregation in (La[subscript 1–y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1–x]Sr[subscript x]CoO[subscript 3−δ] Heterostructured Thin Films.” The Journal of Physical Chemistry Letters 5, no. 6 (March 20, 2014): 1027–1034. https://orcid.org/0000-0003-2477-6412 https://orcid.org/0000-0003-1560-0749 en_US http://dx.doi.org/10.1021/jz500293d The Journal of Physical Chemistry Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Chemical Society (ACS) Other univ. web domain |
| spellingShingle | Feng, Zhenxing Yacoby, Yizhak Gadre, Milind J. Lee, Yueh-Lin Zhou, Hua Biegalski, Michael D. Christen, Hans M. Adler, Stuart B. Morgan, Dane Shao-Horn, Yang Hong, Wesley Terrence Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title | Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title_full | Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title_fullStr | Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title_full_unstemmed | Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title_short | Anomalous Interface and Surface Strontium Segregation in (La[subscript 1-y]Sr[subscript y])[subscript 2]CoO[subscript 4±δ]/La[subscript 1-x]Sr[subscript x]CoO[subscript 3-δ] Heterostructured Thin Films |
| title_sort | anomalous interface and surface strontium segregation in la subscript 1 y sr subscript y subscript 2 coo subscript 4 δ la subscript 1 x sr subscript x coo subscript 3 δ heterostructured thin films |
| url | http://hdl.handle.net/1721.1/97718 https://orcid.org/0000-0003-2477-6412 https://orcid.org/0000-0003-1560-0749 |
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