Publication Date:
2020
Description:
〈p〉Publication date: 29 February 2020〈/p〉
〈p〉〈b〉Source:〈/b〉 Journal of Power Sources, Volume 450〈/p〉
〈p〉Author(s): Honghao Zhang, Jun Wei, Yu Yan, Qianjin Guo, Liqiang Xie, Zhengchun Yang, Jie He, Wen Qi, Zongsheng Cao, Xinhao Zhao, Peng Pan, Huayi Li, Kailiang Zhang, Jinshi Zhao, Xuan Li, Ping Zhang, Kwok Wei Shah〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉In order to improve the production rate of MnO〈sub〉2〈/sub〉 as the excellent supercapacitor materials and enhance the performance of MnO〈sub〉2〈/sub〉 based pseudocapacitor, an innovative mechanical method of ultrasonic assisted shear exfoliation is developed to prepare MnO〈sub〉2〈/sub〉 nanocrystalline in large quantities, and then the MoS〈sub〉2〈/sub〉 composites are deposited by simple magnetron sputtering to form inner heterojunction structure to improve the overall supercapacitor performance. The electrochemical performances of the electrodes fabricated by commodity MnO〈sub〉2〈/sub〉 (c-MnO〈sub〉2〈/sub〉), sheared MnO〈sub〉2〈/sub〉 (s-MnO〈sub〉2〈/sub〉) and s-MnO〈sub〉2〈/sub〉/MoS〈sub〉2〈/sub〉 are studied respectively. The results demonstrate that as-prepared s-MnO〈sub〉2〈/sub〉 presents better supercapacitor performance compared with c-MnO〈sub〉2〈/sub〉 due to the increase of specific surface area after the shearing process. In addition, the s-MnO〈sub〉2〈/sub〉/MoS〈sub〉2〈/sub〉 inner heterostructure shows the best electrochemical reversibility, the highest rate capacity, the most excellent specific capacitance (~224 mF cm〈sup〉−2〈/sup〉) and the highest conductivity among three working electrode materials because of its high specific surface area and good conductivity. The symmetrical all-solid-state supercapacitor based on s-MnO〈sub〉2〈/sub〉/MoS〈sub〉2〈/sub〉 is fabricated, its specific capacitance can still maintain 90% after 3000 cycles of charging/discharging process, and this all-solid-state supercapacitor can power a group of 43 light-emitting diodes (LEDs). In addition, the packaged supercapacitor device can gain excellent capacitance performance during bending.〈/p〉〈/div〉
〈/div〉
〈h5〉Graphical abstract〈/h5〉
〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S037877531931609X-fx1.jpg" width="269" alt="Image 1" title="Image 1"〉〈/figure〉〈/p〉〈/div〉
Print ISSN:
0378-7753
Electronic ISSN:
1873-2755
Topics:
Electrical Engineering, Measurement and Control Technology
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