Iron–Oxalato Framework with One‐Dimensional Open Channels for Electrochemical Sodium‐Ion Intercalation |
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Authors: | Dr. Xianfen Wang Ryosuke Kurono Dr. Shin‐ichi Nishimura Dr. Masashi Okubo Prof. Atsuo Yamada |
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Affiliation: | 1. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7‐3‐1, Bunkyo‐ku, Tokyo 113‐8656 (Japan);2. Unit of Elements Strategy Initiative for Catalysts, Batteries (ESICB), Kyoto University |
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Abstract: | Discovery of a new class of ion intercalation compounds is highly desirable due to its relevance to various electrochemical devices, such as batteries. Herein, we present a new iron–oxalato open framework, which showed reversible Na+ intercalation/extraction. The hydrothermally synthesized K4Na2[Fe(C2O4)2]3 ? 2 H2O possesses one‐dimensional open channels in the oxalato‐bridged network, providing ion accessibility up to two Na+ per the formula unit. The detailed studies on the structural and electronic states revealed that the framework exhibited a solid solution state almost entirely during Na+ intercalation/extraction associated with the reversible redox of Fe. The present work demonstrates possibilities of the oxalato frameworks as tunable and robust ion intercalation electrode materials for various device applications. |
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Keywords: | electrochemistry metal– organic frameworks Mö ssbauer spectroscopy oxalates sodium‐ion batteries |
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