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
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Shao-Horn_Anomalous interface.pdf
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Author(s)
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
Date Issued
March 2014
Journal
The Journal of Physical Chemistry Letters
Publisher
American Chemical Society (ACS)
Citation
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.
Version
Original manuscript
Abstract
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.
MIT Department
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
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DOI of Published Version
http://dx.doi.org/10.1021/jz500293d
