Effect of Cobalt Doping on the Electrochemical Performance of MoS2/CNTs for Supercapacitor Applications

In this study, transition metal sulfide composites were synthesized through a cost-effective and simple hydrothermal method, intended for use as electrode materials in supercapacitors. Studies have shown that the material has excellent electrochemical properties. During the preparation of MoS 2 /carbon nanotubes (CNTs), when 1 mmol of cobalt nitrate replaces sodium molybdate, the composite material achieves a specific capacitance of 1560 A g −1 at a current density of 1 A g −1 and 1335 A g −1 at 10 A g −1 , demonstrating excellent rate performance. After 5000 charge/discharge cycles at a current density of 10 A g −1 , the material maintains a capacity retention of 83.1%, with a coulombic efficiency close to 100%. When assembled into a hybrid capacitor, the specific capacitance still reaches 128.9 F g −1 at a current density of 1 A g −1 , still has 54% capacity retention at a current density of 10 A g −1 , and provides an energy density of 45.83 W h kg −1 at a power density of 800.92 W kg −1 , demonstrating its potential application value in high-efficiency energy storage devices.