Journal
CHEMICAL ENGINEERING JOURNAL
Volume 320, Issue -, Pages 22-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.03.033
Keywords
Ni formate frameworks; NiS; Hierarchical hollow cubes; Supercapacitors
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Funding
- Key Laboratory Open Research Foundation of Xinjiang Autonomous Region [2016D03008]
- National Natural Science Foundation of China [21661029, 21471127, 21301146]
- Technological Innovation Youth Training Project of Xinjiang Autonomous Region [2013721017]
- Graduate Research Innovation Project of Xinjiang [XJGRI2015015]
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Uniform NiS hierarchical hollow cubes Were facilely fabricated by an anion exchange reaction of low-cost Ni formate framework precursor ([CH3NH3][Ni(HCOO)(3)]) with S2-. The hierarchical hollow structure formed due to the Kirkendall effect and Ostwald ripening. When evaluated as electrode materials for supercapacitors, NiS hierarchical hollow cubes exhibited high specific capacitance (874.5 F g(-1) at 1 A g(-1)) and good cycling stability (retention of 90.2% after 3000 cycles). Moreover, the as-fabricated asymmetric supercapacitor had an enhanced energy density of 34.9 Wh kg(-1) at a power density of 387.5 W kg(-1). (C) 2017 Elsevier B.V. All rights reserved.
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