Journal
NANOTECHNOLOGY
Volume 33, Issue 29, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac66ee
Keywords
energy storage; supercapacitors; solid state supercapacitors; 2D materials; doping; DFT
Funding
- Department of Science and Technology (DST)-SERB Early Career Research project [ECR/2017/001850]
- DST-Nanomission [DST/NM/NT/2019/205(G)]
- Karnataka Science and Technology Promotion Society (KSTePS/VGST-RGS-F/2018-19/GRD) [829/315]
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This study reports experimental and theoretical investigations on the effect of cobalt doping in 1T-VSe2, and observes that 3% Co doped VSe2 exhibits better energy storage performance. By assembling a solid state asymmetric supercapacitor with specific electrode materials, excellent energy storage performance is achieved.
Vanadium Diselenide (VSe2) is a prominent candidate in the 2D transition metal dichalcogenides family for energy storage applications. Herein, we report the experimental and theoretical investigations on the effect of cobalt doping in 1T-VSe2. The energy storage performance in terms of specific capacitance, stability and energy and power density is studied. It is observed that 3% Co doped VSe2 exhibits better energy storage performance as compared to other concentrations, with a specific capacitance of similar to 193 F g(-1) in a two-electrode symmetric configuration. First-principles Density Functional Theory based simulations support the experimental findings by suggesting an enhanced quantum capacitance value after the Co doping in the 1T-VSe2. By making use of the advantages of the specific electrode materials, a solid state asymmetric supercapacitor (SASC) is also assembled with MoS2 as the negative electrode. The assembled Co-VSe2//MoS2 SASC device shows excellent energy storage performance with a maximum energy density of 33.36 Wh kg(-1) and a maximum power density of 5148 W kg(-1) with a cyclic stability of 90% after 5000 galvano static charge discharge cycles.
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