期刊
CHINESE CHEMICAL LETTERS
卷 29, 期 4, 页码 616-619出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2017.12.028
关键词
Electroplating; Self-assembling nanosheets; Honeycomb structure; MnO2; Asymmetric supercapacitors; High energy density
资金
- National Natural Science Foundation of China [51672151]
- 973 Program of China [2014CB932401]
A flexible asymmetric supercapacitor with high energy density was constructed by using a flexible substrate of carbonized silk-fabrics decorated with carbon nanotube, electroplating MnO2 nanosheets and dip-coating activated carbon powders as the positive and the negative electrodes, respectively. By controlling the electroplating time, the MnO2 nanosheets can be self-assembled to honeycomb structure and showed excellent electrochemical performance in 1 mol/L Na2SO4 electrolyte with SC950-EP30 performing the best. It exhibited a high specific capacitance (1110.85 Fig at a current density of 1 A/g based on the mass of MnO2) and superior rate capability (77.44% capacity retention from 1 A/g to 10 A/g). Thus, the optimal asymmetric device assembled with this material as positive electrode can deliver a maximum energy density of 43.84 Wh/kg and a maximum power density of 6.62 kW/kg. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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