Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (10): 20220351.doi: 10.7503/cjcu20220351

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Electrochemical Properties of N-CNTs/NiCo-LDH Composite

HOU Congcong1, WANG Huiying1, LI Tingting2, ZHANG Zhiming2(), CHANG Chunrui3, AN Libao1()   

  1. 1.College of Mechanical Engineering
    2.College of Materials Science and Engineering
    3.College of Sciences,North China University of Science and Technology,Tangshan 063210,China
  • Received:2022-05-17 Online:2022-10-10 Published:2022-07-11
  • Contact: ZHANG Zhiming,AN Libao;
  • Supported by:
    the National Natural Science Foundation of China(51472074);the “Hundred Talents Program” of Hebei Province, China(E2012100005)


Nitrogen-doped carbon nanotubes(N-CNTs) were prepared by carbonizing polypyrrole nanotubes at high temperature, and nickel-cobalt layered double hydroxides(NiCo-LDH) were in situ grown on N-CNTs by coprecipitation method to produce N-CNTs/NiCo-LDH composite with three-dimensional interconnected network structure. The effect of different nickel/cobalt molar ratios on the morphology, structure and electrochemical properties of N-CNTs/NiCo-LDH composite was investigated. The results showed that N-CNTs/Ni1Co2-LDH had the best electrochemical performance when the molar ratio of nickel/cobalt was 1∶2. The specific capacitance can reach 1311.8 F/g at a current density of 1 A/g. When the current density was 10 A/g, the capacitance retention rate of N-CNTs/Ni1Co2-LDH was as high as 88.3%, showing excellent rate capability. After 2500 cycles, the capacitance retention rate of N-CNTs/Ni1Co2-LDH can still reach 76.4%, revealing good cycling stability. In addition, the N-CNTs/Ni1Co2-LDH//AC aqueous hybrid supercapacitor assembled by using N-CNTs/Ni1Co2-LDH and activated carbon(AC) electrodes had a high energy density of 27.19 W·h/kg at 750 W/kg power density. The exceptional electrochemical performance indicated that N-CNTs/Ni1Co2-LDH composite had broad application prospects in energy storage.

Key words: Nitrogen-doped carbon nanotubes, Nickel-cobalt layered double hydroxides, Electrode material, Electrochemical performance, Supercapacitor

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