Anomalous
Interface and Surface Strontium Segregation
in (La1–ySry)2CoO4±δ/La1–xSrxCoO3−δ Heterostructured Thin Films
Version 2 2017-08-12, 13:44
Version 1 2015-12-17, 01:08
Posted on 2017-08-12 - 13:44
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‑ySry)2CoO4±δ/La1–xSrxCoO3−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–ySry)2CoO4±δ/La1–xSrxCoO3−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.
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Feng, Zhenxing; Yacoby, Yizhak; Gadre, Milind J.; Lee, Yueh-Lin; Hong, Wesley T.; Zhou, Hua; et al. (2015). Anomalous
Interface and Surface Strontium Segregation
in (La1–ySry)2CoO4±δ/La1–xSrxCoO3−δ Heterostructured Thin Films. ACS Publications. Collection. https://doi.org/10.1021/jz500293d
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AUTHORS (11)
ZF
Zhenxing Feng
YY
Yizhak Yacoby
MG
Milind J. Gadre
YL
Yueh-Lin Lee
WH
Wesley T. Hong
HZ
Hua Zhou
MB
Michael
D. Biegalski
HC
Hans M. Christen
SA
Stuart B. Adler
DM
Dane Morgan
YS
Yang Shao-Horn