Journal
ENERGY
Volume 123, Issue -, Pages 296-304Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.02.018
Keywords
Asymmetric supercapacitor; ZnCo2O4; Freeze-dried RGO; Tunable morphologies; High energy density
Categories
Funding
- China Postdoctoral Science Foundation [2016M591777, 2016M590415]
- National Natural Science Foundation of China for Youths [51603092, 21506081, 21506077]
- Natural Science Foundation of Jiangsu Province for Youths [BK20140533, BK20130484]
- Jiangsu Province Postdoctoral Science Foundation [1501026B]
- University Natural Science Research of Jiangsu [15KJB530004]
- Jiangsu University Scientific Research Funding [15JDG048]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Porous ZnCo2O4 nanostructures with hexamethylenetetramine (HMT) as adscititious alkali are fabricated via a facile hydrothermal route and heat treatment process. The morphology of the materials can be easily tuned from nanowires to nanobelts by simple varying the hydrothermal temperature. Due to the superiority of the porous nanostructure and the convenient ion transport, the obtained ZnCo2O4 nanostructures are further applied as electrode materials for supercapacitors and exhibit noticeable pseudocapacitive performance with high specific capacitance of 776.2 F g(-1) at 1 A g(-1) and good cycle stability (84.3% capacity retention at 3 A g(-1)). Moreover, a high-voltage asymmetric supercapacitor using the ZnCo2O4 as the anode assembled with the freeze-dried reduced graphene oxide (F-RGO) cathode displays superior electrochemical performance with an ultrahigh energy density (84.48 Wh kg(-1) at 0.4 kW kg(-1)), which reveals a great promise for practical application in electrochemical devices. (C) 2017 Elsevier Ltd. All rights reserved.
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