期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 25, 页码 7141-7145出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201702649
关键词
double-shelled structures; hybrid supercapacitors; zeolitic imidazolate frameworks; zinc-cobalt sulfide
资金
- National Research Foundation (NRF) of Singapore via the NRF investigatorship [NRF-NRFI2016-04]
Complex metal-organic frameworks used as precursors allow design and construction of various nanostructured functional materials which might not be accessible by other methods. Here, we develop a sequential chemical etching and sulfurization strategy to prepare well-defined double-shelled zinc-cobalt sulfide (Zn-Co-S) rhombic dodecahedral cages (RDCs). Yolk-shelled zinc/cobalt-based zeolitic imidazolate framework (Zn/Co-ZIF) RDCs are first synthesized by a controlled chemical etching process, followed by a hydrothermal sulfurization reaction to prepare double-shelled Zn-Co-S RDCs. Moreover, the strategy reported in this work enables easy control of the Zn/Co molar ratio in the obtained double-shelled Zn-Co-S RDCs. Owing to the structural and compositional benefits, the obtained double-shelled Zn-Co-S RDCs exhibit enhanced performance with high specific capacitance (1266 Fg(-1) at 1 Ag-1), good rate capability and long-term cycling stability (91% retention over 10,000 cycles) as a battery-type electrode material for hybrid supercapacitors.
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