High-performance hybrid supercapacitors based on MXene/SnS₂/CNT composites on nickel foam electrodes

This research proposed the synthesized MXene/SnS₂/CNT composites using a one-step hydrothermal method as the positive electrode for the hybrid supercapacitor (HSC). The MXene/SnS₂/CNT composites provided high active sites and had the lowest charge transfer resistance of 2.2 Ω and charge transfer resistance of 4.48 Ω. Hence, a high specific capacitance (C_s) of 1049 F/g could be obtained at a current density of 1 A/g. The C_s of MXene/SnS₂/CNT at a current density of 1 A/g was 10.27, 2.6, and 1.36 times higher than that of MXene (105.37 F/g), SnS₂ (410.53 F/g), and MXene/SnS₂ (771.03 F/g), respectively. This indicated that MXene/SnS₂/CNT had excellent capacitance performance. When the current density was increased to 10 A/g, MXene/SnS₂/CNT could still maintain a rate capability of 71 %. The C_s values of HSC at current densities of 3 and 5 A/g were 79 and 61 F/g, respectively, which were a good rate capability of 69 and 53 % compared to the C_s value of 114 F/g at a current density of 1 A/g. Furthermore, the HSC exhibited a high power density of 7020 W/kg at a low energy density of 11.7 Wh/kg. In this study, the developed HSCs were used for LEDs lighting and computer driving.