期刊
VACUUM
卷 176, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2020.109315
关键词
Porous microstructure; Graphene-wrapped; MnO2; Supercapacitors
资金
- National Natural Science Foundation of China [51772176, 51971121, 51902189, 51801114]
- Taishan Scholarship of Climbing Plan [tspd20161006]
Graphene-wrapped MnO2 was prepared via a solution-based ultrasonic-assisted method. The porous MnO2 microspheres wrapped with graphene nanosheets exhibit high specific surface area, facilitating fast ion diffusion/transport. The graphene-wrapped MnO2 demonstrates superior electrochemical performance (1227 F g(-1) at 0.5 A g(-1) and retaining nearly 90% of the initial capacity after 5000 cycles at 2 A g(-1)) to the MnO2 microsphere (728 F g(-1) at 0.5 A g(-1) and capacity retention of 83.7% after 5000 cycles at 2 A g(-1)). Moreover, the asymmetric supercapacitor based on the graphene-wrapped MnO2 reveals a high energy density of 19.6 Wh kg(-1) at a power density of 351 W kg(-1), demonstrating a great potential as the electrode material for energy storage devices.
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