Improved structure and supercapacitor performance by harnessing MoS/ZnS/GO &CNTs Nanospheres

The pure MoS, binary ZnS/MoS, and ternary ZnS/MoS/composites incorporated with carbonaceous materials such as SWCNT, MWCNT, and GO nano-composites are synthesized using a hydrothermal technique. The compositions of the pure, binary, and ternary nano-composites are maintained at ratios of 100, 90:10, and 86:10:4, respectively. The XRD analysis confirmed the formation of a hexagonal single-phase structure. The surface morphology revealed well-defined nano-spheres with clear boundaries. Among the prepared materials, the ternary ZnS (86 %)–MoS (10 %)–GO (4 %) composite exhibited excellent electrochemical performance, delivering an average specific capacitance of 1098 F/g at various scan rates. It also demonstrated a high energy density of 1093 Wh/kg and a power density of 9.3 W/kg. A predominant pseudocapacitive charge-storage behavior is observed, with a diffusive contribution of 85.47 % at a scan rate of 5 mV/s, indicating its potential as a promising candidate for advanced energy storage systems. The enhanced electrochemical performance is attributed to the synergistic effect of transition metal sulfides combined with carbonaceous materials.