Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (3): 945-951.doi: 10.19799/j.cnki.2095-4239.2021.0018

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Nitrogen-doped amorphous vanadium oxide nanosheet arrays for rapid-charging quasi-solid asymmetric supercapacitors

Shuai CHEN(), Ling CHEN, Hao JIANG()   

  1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2021-01-14 Revised:2021-02-15 Online:2021-05-05 Published:2021-04-30
  • Contact: Hao JIANG E-mail:1641377385@qq.com;jianghao@ecust.edu.cn

Abstract:

The development of anode materials with high specific capacitance and wide voltage is a valid approach to increase the energy density of quasi-solid asymmetric supercapacitors. Herein, nitrogen-doped amorphous vanadium oxide arrays are constructed on the surface of a carbon cloth by means of the hydrothermal reaction and subsequent interaction with ammonia. Compared with the undoped one, the nitrogen-doped amorphous vanadium oxide delivers a high specific capacitance of 432.2 F·g-1 at -0.9~0 V with an excellent cycling stability and maintains a value of 203.3 F·g-1 when the current density increases to 10 A·g-1. When assembling into a quasi-solid asymmetric supercapacitor with a MnO2@CC positive-electrode and PVA/LiCl gel-electrolyte membrane, the device shows a remarkably improved energy density of 50.5 W·h·kg-1 at a power density of 475 W·kg-1. The excellent electrochemical performance can be mainly attributed to its unique nanostructure. The amorphization induces vanadium oxide to expose more reactive sites, whereas nitrogen doping greatly improves the intrinsic conductivity with reduced polarization during the electrochemical process, hence significantly enhancing the specific capacitance and reaction kinetics.

Key words: nitrogen doping, vanadium oxide, quasi-solid, supercapacitors

CLC Number: