Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (03): 615-619.doi: 10.3866/PKU.WHXB20110317

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Supercapacitance of NiCo2O4 Nanowire Arrays Grown on Nickel Foam

YU Li-Qiu, CHEN Shu-Li, CHANG Sha, LI Yun-Hu, GAO Yin-Yi, WANG Gui-Ling, CAO Dian-Xue   

  1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
  • Received:2010-10-15 Revised:2010-11-27 Published:2011-03-03
  • Contact: CAO Dian-Xue
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973048) and Fundamental Research Funds for the Central Universities, China (HEUCF101004).


We prepared an electrode consisting of NiCo2O4 nanowire arrays that stand freely on nickel foam by a template-free growth method. Its morphology was determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase structure of the nanowires was analyzed by X-ray diffraction (XRD). The supercapacitance of the electrode was investigated by cyclic voltammetry, galvanostatic charge-discharge testing, and electrochemical impedance spectroscopy. The results showed that the nanowires were nearly vertical grow on and densely cover the nickel foam substrate. The nanowires have diameters around 500-1000 nm and lengths up to around 10 μm. The NiCo2O4 nanowire arrays have a specific capacitance of 741 F·g-1 and this value is 655 F·g-1 after 420 charge-discharge cycles. Electrochemical impedance spectroscopy measurements showed that the charge transfer resistance was only 0.33 Ω and this increased by only 0.06 Ω after 420 cycles.

Key words: NiCo2O4, Nanowire array, Template-free growth method, Nickel foam, Surpercapacitor


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