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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2011,Vol.27>> Issue(03)>> 615-619     doi: 10.3866/PKU.WHXB20110317         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
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
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
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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.



Keywords: NiCo2O4   Nanowire array   Template-free growth method   Nickel foam   Surpercapacitor  
Received: 2010-10-15 Accepted: 2010-11-27 Publication Date (Web): 2011-01-28
Corresponding Authors: CAO Dian-Xue Email: caodianxue@hrbeu.edu.cn

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

Cite this article: YU Li-Qiu, CHEN Shu-Li, CHANG Sha, LI Yun-Hu, GAO Yin-Yi, WANG Gui-Ling CAO Dian-Xue. Supercapacitance of NiCo2O4 Nanowire Arrays Grown on Nickel Foam[J]. Acta Phys. -Chim. Sin., 2011,27 (03): 615-619.    doi: 10.3866/PKU.WHXB20110317

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