Enhanced energy density and power density of asymmetric supercapacitor by induced defects on the surface of MoS2 with strontium atoms

Supercapacitors (SCs) have gained considerable attention in growing global demands especially in automobile, renewable energy production, and storage applications. In this work, pure and Strontium (Sr)-doped MoS2 nanosheets have been synthesized by a simple hydrothermal method for supercapacitor applications. The physical properties (structural, morphological) of Sr-doped MoS2 semiconductor are characterized by fundamental characteristic tools. The electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance spectroscopy measurements. The 10% Sr-doped MoS2 demonstrated better specific capacitance (Csp 489.75 F/g) at 1 A/g and excellent electrochemical stability (62.5% of capacity retention after 2000 cycle at 10 A/g) when distinguished with other electrode materials. These eminent activities attribute to effective charge transport property in 10% Sr-doped MoS2 compared to undoped and 5% Sr-doped electrodes. Due to this decisive electrochemical accomplishment and remarkable cyclic stability, 10% Sr-doped MoS2 can be an applicable electrode material for SCs. The asymmetric supercapacitor was fabricated with rGO and 10% Sr-doped MoS2. Herewith, the power density is 5760 W/kg, and the energy density reaches 31 Wh/kg.