Synergistic effect of MnS@Bi 2 S 3 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@Bi 2 S 3 composites were obtained via three-step hydrothermal synthesized method. The MnS@Bi 2 S 3 composite exhibited superior electrochemical performance with specific capacitance 185 F g -1 , compared to MnS (22 F g -1 ) and Bi 2 S 3 (45 F g - 1 ) at current density 1 A g -1 . Additionally, after 5000 cycles, MnS@Bi 2 S 3 exhibited superior capacitance retention of 92 % compared to 40 % and 73 % for MnS and Bi 2 S 3 , respectively. The superior performance of MnS@Bi 2 S 3 composite can be attributed to its higher specific surface area and the synergistic effect of MnS and Bi 2 S 3 .