Nickel sulfide-based materials have shown great potential for electrode fabrication owing to their high theoretical specific capacitance but poor conductivity and morphological aggregation. A feasible strategy is to design hybrid structure by introducing highly-conductive porous carbon as the supporting matrix. Herein, we synthesized hybrid composites consisting of interconnected NiS-nanosheets and porous carbon (NiS@C) derived from Zeolitic-imidazolate frameworks (ZIFs) using a facile low-temperature water-bath method. When employed as electrode materials, the as-prepared NiS@C nanocomposites present remarkable electrochemical performance owing to the complex effect that is the combined advantages of double-layer capacitor-type porous carbon and pseudocapacitortype interconnected-NiS nanosheets. Specifically, the NiS@C nanocomposites exhibit a high specific capacitance of 1827 F g(-1) at 1 A g(-1), and excellent cyclic stability with a capacity retention of 72% at a very high current density of 20 A g(-1) after 5000 cycles. Moreover, the fabricated hybrid supercapacitor delivers 21.6 Wh kg(-1) at 400 W kg(-1) with coulombic efficiency of 93.9%, and reaches 10.8 Wh kg(-1) at a high power density of 8000 W kg(-1), along with excellent cyclic stability of 84% at 5 A g(-1) after 5000 cycles. All results suggest that NiS@C nanocomposites are applicable to high-performance electrodes in hybrid supercapacitors and other energy-storage device applications. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.