Interconnected NiS-nanosheets@porous carbon derived from Zeolitic-imidazolate frameworks (ZIFs) as electrode materials for high-performance hybrid supercapacitors |
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| Affiliation: | 1. School of Materials & Physics, China University of Mining & Technology, Xuzhou, 221116, PR China;2. Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining & Technology, Xuzhou, PR China;3. The Xuzhou City Key Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining & Technology, Xuzhou, PR China;1. School of Material Science and Engineering, China University of Mining and Technology, XuZhou 221116, China;2. School of Mechanical Engineering, Jiangxi Vocational College of Industry & Engineering, PingXiang 337000, China;1. Key Laboratory of Energy Materials Chemistry (Xinjiang University), Ministry of Education, PR China;2. Key Laboratory of Advanced Functional Materials, Autonomous Region, PR China;3. Institute of Applied Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, PR China;4. Physics and Chemistry Detecting Center, Xinjiang University, Urumqi, 830046, Xinjiang, PR China |
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| Abstract: | 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 pseudocapacitor-type 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. |
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| Keywords: | NiS Supercapacitor ZIFs Nanocomposite Carbon materials |
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