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 E-mail:caodianxue@hrbeu.edu.cn
  • 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).

Abstract:

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

MSC2000: 

  • O646