Superior electrochemical performance of bimetallic sulfides as electrode materials for battery supercapacitor applications

Hybrid supercapacitors have achieved much attention for their versatility in energy storage applications. But they still require better electrode materials with flashing electrochemical properties to boost their specific capacity, energy, and power limits. The improved electrical conductivity and high electrochemical activities of transition metal sulfides make them ideal contenders to be use for hybrid supercapacitor applications. In this regard, CoMnS was synthesized with different concentrations by employing a hydrothermal approach. The synergistic effect of Co0 center dot 50Mn0 center dot 50S shows optimum performance in three electrode configuration by delivering high specific capacity (Qs) of 542.8 C/g at 2.0 A/g. This electrode also shows lower series resistance during electrochemical impedance spectroscopy, confirming their better electrical conductivity. A hybrid device (Co0 center dot 50Mn0 center dot 50S//AC) was accomplished showing intriguing properties which includes Qs of 191.8 C/g (0.4 A/g) with great cycling stability (95.02%) and rate capability. The fabricated device also results in high energy of 45.28 W h/kg with great power of 1700 W/kg. Furthermore, diffusive, and capacitive contributions were evaluated to validate our experimental outcomes. Considering these results, the as-synthesized material is a potential choice for battery-supercapacitor applications.

Automated summary

Hybrid supercapacitors have attracted attention for energy storage applications, but better electrode materials are needed to improve their capacity and power limits. Transition metal sulfides, with improved electrical conductivity and high electrochemical activities, are ideal contenders for hybrid supercapacitor applications. CoMnS synthesized with different concentrations showed optimum performance in a three electrode configuration, delivering high specific capacity and lower series resistance. The fabricated hybrid device exhibited intriguing properties, including high energy and power.