Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 9, Pages 2675-2679Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201812387
Keywords
cobalt sulfide; ion-exchange reaction; multi-shelled structures; sodium-ion battery
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Funding
- National Research Foundation (NRF) of Singapore via the NRF investigatorship [NRF-NRFI2016-04]
- National Natural Science Foundation of China [U1804255]
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We report the synthesis of cobalt sulfide multi-shelled nanoboxes through metal-organic framework (MOF)-based complex anion conversion and exchange processes. The polyvanadate ions react with cobalt-based zeolitic imidazolate framework-67 (ZIF-67) nanocubes to form ZIF-67/cobalt polyvanadate yolk-shelled particles. The as-formed yolk-shelled particles are gradually converted into cobalt divanadate multi-shelled nanoboxes by solvothermal treatment. The number of shells can be easily controlled from 2 to 5 by varying the temperature. Finally, cobalt sulfide multi-shelled nanoboxes are produced through ion-exchange with S2- ions and subsequent annealing. The as-obtained cobalt sulfide multi-shelled nanoboxes exhibit enhanced sodium-storage properties when evaluated as anodes for sodium-ion batteries. For example, a high specific capacity of 438 mAhg(-1) can be retained after 100 cycles at the current density of 500 mAg(-1).
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