| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Synthesis of Ni-Co Hydroxide/Graphene Hydrogel Composites with Three-dimensional Network Structure and Their Electrochemical Performance |
| LIU Tingting1,2,*, TIAN Guoxing3, ZHAO Xin3, YU Xinyong3, MAO Chao3, YU Xuehan3, CHEN Ling3,4,*
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1 Northeast Petroleum University at Qinhuangdao, Qinhuangdao 066004, Hebei, China
2 Provincial Key Laboratory of Polyolefin New Materials, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
3 Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China
4 Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract In this work, graphene oxide (GO) was prereduced by chemical reduction method, and then mixed with Ni(NO3)2·6H2O and Co(NO3)2·6H2O for hydrothermal reaction to obtain the composites of nickel-cobalt hydroxide/graphene hydrogel with three-dimensional network structure. By adjusting the amount of GO, nickel-cobalt hydroxide/graphene hydrogel (NiCo-OH/GH100) with the best electrochemical performance was acquired, and nickel-cobalt hydroxide nanosheets were distributed on the surface of graphene uniformly. The specific capacitance of NiCo-OH/GH100 was 590 F/g at a current density of 0.5 A/g, and the retention rate was 76.1% when the current density increased to 10 A/g, showing high specific capacitance and good rate performance. The asymmetric supercapacitor (ASC) of NiCo-OH/GH100∥nitrogen-doped graphene hydrogel compounded with carbon nanotube (NCGH) was assembled, and the specific capacitance retention was 92.9% after 10 000 charge-discharge cycles at 20 A/g. The energy density reached 23.9 Wh/kg at the power density of 375 W/kg.
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Published: 10 March 2024
Online: 2024-03-18
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| Fund:National Natural Science Foundation Youth Fund of China (51904077). |
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2024, Vol. 38 
