Facile Construction of 3D Reduced Graphene Oxide Wrapped Ni3S2 Nanoparticles on Ni Foam for High‐Performance Asymmetric Supercapacitor Electrodes |
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Authors: | Jiqiu Qi Yuan Chang Yanwei Sui Yezeng He Qingkun Meng Fuxiang Wei Yulong Zhao Yunxue Jin |
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Institution: | 1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, P. R. China;2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, P. R. China |
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Abstract: | 3D reduced graphene oxide (rGO)‐wrapped Ni3S2 nanoparticles on Ni foam with porous structure is successfully synthesized via a facile one‐step solvothermal method. This unique structure and the positive synergistic effect between Ni3S2 nanoparticles and graphene can greatly improve the electrochemical performance of the NF@rGO/Ni3S2 composite. Detailed electrochemical measurements show that the NF@rGO/Ni3S2 composite exhibits excellent supercapacitor performance with a high specific capacitance of 4048 mF cm?2 (816.8 F g?1) at a current density of 5 mA cm?2 (0.98 A g?1), as well as long cycling ability (93.8% capacitance retention after 6000 cycles at a current density of 25 mA cm?2). A novel aqueous asymmetric supercapacitor is designed using the NF@rGO/Ni3S2 composite as positive electrode and nitrogen‐doped graphene as negative electrode. The assembled device displays an energy density of 32.6 W h kg?1 at a power density of 399.8 W kg?1, and maintains 16.7 W h kg?1 at 8000.2 W kg?1. This outstanding performance promotes the as‐prepared NF@rGO/Ni3S2 composite to be ideal electrode materials for supercapacitors. |
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Keywords: | asymmetric supercapacitors electrochemical performance Ni3S2 nanoparticles rGO wrapped structures |
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