Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (5): 487-492.DOI: 10.15541/jim20180343

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Co3O4 Nanowire Arrays@Activated Carbon Fiber Composite Materials: Facile Hydrothermal Synthesis and Its Electrochemical Application

Wei LIU1,2,3,Kai ZHENG2,Dong-Hong WANG1,2,Yi-San LEI1,2(),Huai-Lin FAN3   

  1. 1. Shanxi Key Laboratory of Electromagnetic Protection Material and Technology, Taiyuan 030032, China
    2. The 33rd Institute of China Electronics Technology Group Corporation, Taiyuan 030032, China
    3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:2018-07-26 Revised:2018-10-30 Published:2019-05-20 Online:2019-05-14
  • Supported by:
    National Natural Science Foundation of China U1710115(U1710115);Natural Science Foundation of Shanxi Province(201701D121050);Joint Foundation of China Electronic Technology Group Corporation(6401B08110304)


Co3O4@activated carbon fibers (ACF) composites were prepared through a facile hydrothermal method followed by calcination process, involving the growth of Co3O4 nanowires on ACF surface. Co(NO3)2·6H2O was used as Co source, urea and NH4F as additives. The structures and morphologies of Co3O4@ACF composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N2 adsorption/desorption measures, and thermogravimetric analysis (TGA). The electrochemical properties of Co3O4@ACF composites were investigated by cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results showed that Co3O4 nanowire arrays uniformly grew on the surface of ACF along the vertical direction, forming abundant mesoporous structures. Co3O4@ACF composites with various Co3O4 fractions could be obtained by adding different amount of Co(NO3)2·6H2O. Furthermore, Co3O4@ACF composite with 47wt% Co3O4 fraction exhibited a high specific capacitance of 566.9 F/g at a current density of 1 A/g, which was almost twice as high as that of pure Co3O4. Even at 15 A/g, the composite still delivered a specific capacitance of 393.3 F/g, showing good rate capability. The specific capacitance of the composite could retain 84.2% of initial value after 5000 charging/discharging cycles, which indicates its superior cycling stability.

Key words: activated carbon fiber, hydrothermal method, cobaltosic oxide, supercapacitor

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