Anomalous Interface and Surface Strontium Segregation in (La 1– y Sr y ) 2 CoO 4±δ /La 1– x Sr x CoO 3−δ Heterostructured Thin Films

Handle URI:
http://hdl.handle.net/10754/597580
Title:
Anomalous Interface and Surface Strontium Segregation in (La 1– y Sr y ) 2 CoO 4±δ /La 1– x Sr x CoO 3−δ Heterostructured Thin Films
Authors:
Feng, Zhenxing; Yacoby, Yizhak; Gadre, Milind J.; Lee, Yueh-Lin; Hong, Wesley T.; Zhou, Hua; Biegalski, Michael D.; Christen, Hans M.; Adler, Stuart B.; Morgan, Dane; Shao-Horn, Yang
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 (La1-ySr y)2CoO4±δ/La1-xSr xCoO3-δ heterostructure is remarkably enhanced relative to the Ruddlesden-Popper and perovskite constituents. Here we report the first atomic-scale structure and composition of (La1-ySr y)2CoO4±δ/La1-xSr xCoO3-δ grown on SrTiO3. 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 O2. Our findings provide insights into the design of highly active catalysts for oxygen electrocatalysis. © 2014 American Chemical Society.
Citation:
Feng Z, Yacoby Y, Gadre MJ, Lee Y-L, Hong WT, et al. (2014) Anomalous Interface and Surface Strontium Segregation in (La 1– y Sr y ) 2 CoO 4±δ /La 1– x Sr x CoO 3−δ Heterostructured Thin Films . The Journal of Physical Chemistry Letters 5: 1027–1034. Available: http://dx.doi.org/10.1021/jz500293d.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry Letters
Issue Date:
20-Mar-2014
DOI:
10.1021/jz500293d
PubMed ID:
26270983
Type:
Article
ISSN:
1948-7185
Sponsors:
This work was partially supported by DOE (SISGR DESC0002633) and King Abdullah University of Science and Technology. We thank the King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia for funding the research reported in this paper through the Center for Clean Water and Clean Energy at MIT and KFUPM. This research was supported by the Israel Science Foundation under grant no. 1005/11. Support for Y.-L.L. was provided by Department of Energy (DOE), National Energy Technology Laboratory (NETL), Solid State Energy Conversion Alliance (SECA) Core Technology Program, Funding Opportunity Number DEFE0009435, and that for M.J.G. was provided by U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award number DESC0001284. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. We acknowledge the support from the beamline scientists including Zhan Zhang, Christian M. Schlepuetz, and Lynette Jirik at ID-33 of APS. Samples were synthesized at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE under Contract No. CNMS2012-284.
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DC FieldValue Language
dc.contributor.authorFeng, Zhenxingen
dc.contributor.authorYacoby, Yizhaken
dc.contributor.authorGadre, Milind J.en
dc.contributor.authorLee, Yueh-Linen
dc.contributor.authorHong, Wesley T.en
dc.contributor.authorZhou, Huaen
dc.contributor.authorBiegalski, Michael D.en
dc.contributor.authorChristen, Hans M.en
dc.contributor.authorAdler, Stuart B.en
dc.contributor.authorMorgan, Daneen
dc.contributor.authorShao-Horn, Yangen
dc.date.accessioned2016-02-25T12:42:27Zen
dc.date.available2016-02-25T12:42:27Zen
dc.date.issued2014-03-20en
dc.identifier.citationFeng Z, Yacoby Y, Gadre MJ, Lee Y-L, Hong WT, et al. (2014) Anomalous Interface and Surface Strontium Segregation in (La 1– y Sr y ) 2 CoO 4±δ /La 1– x Sr x CoO 3−δ Heterostructured Thin Films . The Journal of Physical Chemistry Letters 5: 1027–1034. Available: http://dx.doi.org/10.1021/jz500293d.en
dc.identifier.issn1948-7185en
dc.identifier.pmid26270983en
dc.identifier.doi10.1021/jz500293den
dc.identifier.urihttp://hdl.handle.net/10754/597580en
dc.description.abstractHeterostructured 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 (La1-ySr y)2CoO4±δ/La1-xSr xCoO3-δ heterostructure is remarkably enhanced relative to the Ruddlesden-Popper and perovskite constituents. Here we report the first atomic-scale structure and composition of (La1-ySr y)2CoO4±δ/La1-xSr xCoO3-δ grown on SrTiO3. 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 O2. Our findings provide insights into the design of highly active catalysts for oxygen electrocatalysis. © 2014 American Chemical Society.en
dc.description.sponsorshipThis work was partially supported by DOE (SISGR DESC0002633) and King Abdullah University of Science and Technology. We thank the King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia for funding the research reported in this paper through the Center for Clean Water and Clean Energy at MIT and KFUPM. This research was supported by the Israel Science Foundation under grant no. 1005/11. Support for Y.-L.L. was provided by Department of Energy (DOE), National Energy Technology Laboratory (NETL), Solid State Energy Conversion Alliance (SECA) Core Technology Program, Funding Opportunity Number DEFE0009435, and that for M.J.G. was provided by U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award number DESC0001284. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. We acknowledge the support from the beamline scientists including Zhan Zhang, Christian M. Schlepuetz, and Lynette Jirik at ID-33 of APS. Samples were synthesized at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE under Contract No. CNMS2012-284.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectab initio calculationen
dc.subjectcoherent Bragg rod analysisen
dc.subjectfuel cellen
dc.subjectheterostructure perovskitesen
dc.subjectoxidesen
dc.subjectstrontium segregationen
dc.subjectsurface and interfaceen
dc.titleAnomalous Interface and Surface Strontium Segregation in (La 1– y Sr y ) 2 CoO 4±δ /La 1– x Sr x CoO 3−δ Heterostructured Thin Filmsen
dc.typeArticleen
dc.identifier.journalThe Journal of Physical Chemistry Lettersen
dc.contributor.institutionMassachusetts Institute of Technology, Cambridge, United Statesen
dc.contributor.institutionHebrew University of Jerusalem, Jerusalem, Israelen
dc.contributor.institutionArgonne National Laboratory, Argonne, United Statesen
dc.contributor.institutionOak Ridge National Laboratory, Oak Ridge, United Statesen
dc.contributor.institutionUniversity of Wisconsin Madison, Madison, United Statesen
dc.contributor.institutionUniversity of Washington Seattle, Seattle, United Statesen

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