Journal
JOURNAL OF ENERGY STORAGE
Volume 67, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2023.107656
Keywords
Vanadium sulfide; Copper sulfide; Vanadium copper sulfide; Advanced energy materials; Supercapattery
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In this study, vanadium copper sulfide (VCuS) material was synthesized using a hydrothermal method, and its electrochemical activity was investigated. The results showed that VCuS material exhibits high specific capacity and conductivity, and displayed excellent cycling stability in supercapattery testing.
The increasing energy consumption in modern society requires long-term energy storage technology. The main problem for a sustainable energy storage system is energy optimization and power density. The vanadium copper sulfide (VCuS) was hydrothermally synthesized in this study. The electrochemical activity of the VCuS was studied with the three-cell configuration, which demonstrated a maximum capacity of 475C/g (at 1.0 A/g), higher than VS2 and CuS. The surface area for VCuS was 13.65 m2/g, estimated using the BET measurement. The conductivity of VCuS was measured to be 233 mS/cm, while 1 M KOH electrolyte shows maximum conductivity of 206 mS/cm. The supercapattery (VCuS//AC) delivers an excellent specific capacity of 163C/g having a current density of 1.0 A/g. The VCuS//AC can provide energy of 34.5 Wh/kg at 800 W/kg power density (at 1.0 A/g). Additionally, the VCuS//AC durability test measured capacity retention after subjecting it to 10,000 cycles. The VCuS//AC displayed excellent cycling stability of 80 % after 10,000 cycle repetitions.
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