Nickel Sulfide/Carbon Nanotube Nanocomposites As High Performance Cathode Materials for Asymmetric Supercapacitors
In this study, the Ni3S2/carbon nanotube composites were successfully developed by means of the glucose-assisted hydrothermal method. The composite electrode shows a high specific capacitance of 800 F/g and great cycling stability at a current density of 3.2 A/g. Furthermore, an asymmetric supercapacitor device was fabricated by using the composite of Ni3S2 and MWCNTs as the cathode and activated carbon as the anode. The fabricated device can be operated reversibly between 0 and 1.6 V, and obtain a high specific capacitance of 55.8 F/g at 1 A/g. It also delivers a maximum energy density of 19.8 Wh/kg with a power density of 798 W/kg. As a result, the asymmetric supercapacitor device based on the Ni3S2/MWCNTs cathode can be considered as a promising energy storage device.