Abstract
Transition metal sulfide is a good choice for supercapacitor anode materials. Herein, 3D NiS with flower-like shape was grown on MXene (Ti3C2TX) with one-step hydrothermal method. Connected nanoflakes in the composite formed a large void network structure, which favors the transfer of ions and charges. Compared with pure MXene, MXene/NiS composite exhibited higher specific capacity of 554.1 mAhg−1 (857.8 F g−1) at 1 A g−1 which is approximately 4 times greater than that MXene and superior cycle performance of 99.49% capacitance retained after 3000 cycles at 5 A g−1. The asymmetric supercapacitors were assemble in 2 M KOH alkaline solution with anode of MXene/NiS and cathode of G/AC (graphene/activated carbon). The ASCs device emerges a remarkable cycle performance of 97.7% after 3000 cycles and the energy density is up to 17.688 Wh kg−1 at a power density of 750 W kg−1. The small bulb (12 V, 2 W) can be lit for more than 100 s.
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