Synergistic effect of MnS@Bi₂S₃ nanosheets for enhanced electrochemical performance in aqueous electrolyte supercapacitor application

With the low electronegativity of sulfur to oxygen, metal sulfides have become of much interest in energy storage system application, due to their high redox reactive sites and structure stability. However, composite of two or more metal sulfides is considered one of the strategies to improve the electrochemical properties, by utilizing the synergistic effect of the individual metal sulfides components. Here, MnS@Bi₂S₃ composites were obtained via three-step hydrothermal synthesized method. The MnS@Bi₂S₃ composite exhibited superior electrochemical performance with specific capacitance 185 F g⁻¹, compared to MnS (22 F g⁻¹) and Bi₂S₃ (45 F g⁻¹) at current density 1 A g⁻¹. Additionally, after 5000 cycles, MnS@Bi₂S₃ exhibited superior capacitance retention of 92 % compared to 40 % and 73 % for MnS and Bi₂S₃, respectively. The superior performance of MnS@Bi₂S₃ composite can be attributed to its higher specific surface area and the synergistic effect of MnS and Bi₂S₃.