One-step electrodeposited Ni3S2/Co9S8/NiS composite on Ni foam as high-performance electrode for supercapacitors

Transition metal sulfides (TMSs) are considered as one of the promising electrode materials due to their fascinating redox reversibility and electronic conductivity. However, volume expansion during the charge/discharge process impedes their practical applications. The reasonable design of TMS electrode materials with unique morphology can improve the energy storage performance. Herein, we prepared the Ni3S2/Co9S8/NiS composite that is in situ grown on Ni foam (NF) via a one-step electrodeposition process. The optimized Ni3S2/Co9S8/NiS-7 shows a superhigh specific capacity of 2785.3 F g(-1) at 1 A g(-1) and remarkable rate capability. Furthermore, the as-assembled device displays a high energy density of 40.1 W h kg(-1) at a power density of 799.3 W kg(-1) and a satisfactory stability of 96.6% retention after 5000 cycles. This work provides a facile way to fabricate new TMS electrode materials for high-performance supercapacitors.

Automated summary

Transition metal sulfides (TMSs) are promising electrode materials for high-performance supercapacitors due to their reversible redox reactions and good conductivity, but their volume expansion during charge/discharge process hinders practical applications. In this study, a Ni3S2/Co9S8/NiS composite was prepared by electrodeposition on Ni foam, which exhibited a high specific capacity of 2785.3 F g(-1) at 1 A g(-1) and excellent rate capability. The assembled device also showed a high energy density of 40.1 W h kg(-1) at a power density of 799.3 W kg(-1) and a satisfactory stability with 96.6% retention after 5000 cycles. This work provides a facile method to fabricate new TMS electrode materials for high-performance supercapacitors.