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Iron–Oxalato Framework with One‐Dimensional Open Channels for Electrochemical Sodium‐Ion Intercalation
Author(s) -
Wang Xianfen,
Kurono Ryosuke,
Nishimura Shinichi,
Okubo Masashi,
Yamada Atsuo
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404929
Subject(s) - intercalation (chemistry) , electrochemistry , formula unit , ion , redox , materials science , electrode , extraction (chemistry) , inorganic chemistry , chemistry , crystallography , crystal structure , chromatography , organic chemistry
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 K 4 Na 2 [Fe(C 2 O 4 ) 2 ] 3 ⋅ 2 H 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.