Anomalous Interface and Surface Strontium Segregation in (La1–ySry)2CoO4±δ/La1–xSrxCoO3−δ Heterostructured Thin Films
作者： Zhenxing Feng , Yizhak Yacoby , Milind J. Gadre , Yueh-Lin Lee , Wesley T. Hong
DOI: 10.1021/JZ500293D
关键词: Oxygen 、 Heterojunction 、 Annealing (metallurgy) 、 Chemical engineering 、 Materials science 、 Strontium 、 Mineralogy 、 Electrocatalyst 、 Thin film 、 Electrochemistry 、 Ab initio quantum chemistry methods
摘要: Heterostructured oxides have shown unusual electrochemical properties including enhanced catalytic activity, ion transport, and stability. In particular, it has been recently that the activity of oxygen electrocatalysis on Ruddlesden-Popper/perovskite (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ heterostructure is remarkably relative to Ruddlesden-Popper perovskite constituents. Here we report first atomic-scale structure composition grown SrTiO3. We observe anomalous strontium segregation from interface phase using direct X-ray methods as well with ab initio calculations. Such Sr occurred during film growth, no significant changes were found upon subsequent annealing in O2. Our findings provide insights into design highly active catalysts for electrocatalysis.
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