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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 04: 372 - 376

DOI: https://doi.org/10.6023/A1110012

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Electrochemical Capacitance of Ni Foam Supported Co(OH)2 Nanowires

  • Xu Yang ,
  • Liu Xinwei ,
  • Zhai Jingru ,
  • Chen Shuli ,
  • Cao Dianxue ,
  • Wang Guiling
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  • a College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001;
    b College of Pharmacy, Heilongjiang University of Traditional Chinese Medicine, Harbin 150040

Received date: 2011-10-09

  Revised date: 2011-11-03

  Online published: 2011-11-09

Supported by

Project was supported by the National Natural Science Foundation of China (No. 20973048).

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Abstract

The electrode of Co(OH)2 nanowires freely standing on nickel foam was prepared via template- free growth method. Its morphology was examined by scanning electron microscopy (SEM) and transmission electron microscope (TEM), the phase structure of Co(OH)2 was analyzed by X-ray diffraction spectroscopy (XRD), and the electrochemical capacitance of the electrode was investigated by cyclic voltammetry, galvanostatic charge-discharge test and electrochemical impedance spectroscopy. The results show that Co(OH)2 nanowires grow on and densely cover the nickel foam substrate. The Co(OH)2 nanowires have diameters around 300 nm and lengths up to around 8～10 μm. The Co(OH)2 nanowires display a specific capacitance of 677 F·g-1 and remain to be 574 F·g-1 after 500 charge-discharge cycles. Electrochemical impedance spectroscopy measurement shows that the charge transfer resistance is only 0.23 Ω and increased only by 0.03 Ω after 500 cycles.

Key words： template-free growth method; Co(OH)2 nanowire; nickel foam; morphology; electrochemical capacitor

Cite this article

Xu Yang , Liu Xinwei , Zhai Jingru , Chen Shuli , Cao Dianxue , Wang Guiling . Electrochemical Capacitance of Ni Foam Supported Co(OH)2 Nanowires[J]. Acta Chimica Sinica, 2012 , 70(04) : 372 -376 . DOI: 10.6023/A1110012

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