Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 3, Pages 1096-1101Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201404929
Keywords
electrochemistry; metal-organic frameworks; Mossbauer spectroscopy; oxalates; sodium-ion batteries
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Funding
- Mitsubishi Motors Corporation
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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)2H(2)O 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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