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化学学报
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化学学报 ›› 2012, Vol. 70 ›› Issue (04): 372-376.DOI: 10.6023/A1110012 上一篇    下一篇

研究论文

泡沫镍载Co(OH)2 纳米线的电化学电容性能

徐暘a,b, 刘新伟a, 翟婧如a, 陈书礼a, 曹殿学a, 王贵领a   

  1. a 哈尔滨工程大学材料科学与化学工程学院 哈尔滨 150001;
    b 黑龙江中医药大学药学院 哈尔滨 150040
  • 投稿日期:2011-10-09 修回日期:2011-11-03 发布日期:2011-11-09
  • 通讯作者: 王贵领
  • 基金资助:

    国家自然科学基金(No. 20973048)资助项目.

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

Xu Yanga,b, Liu Xinweia, Zhai Jingrua, Chen Shulia, Cao Dianxuea, Wang Guilinga   

  1. 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:2011-10-09 Revised:2011-11-03 Published:2011-11-09
  • Supported by:

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

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以无模板法制备了泡沫镍载Co(OH)2 纳米线电极, 利用扫描电镜(SEM)和透射电镜(TEM)观测了纳米线的表面形貌, 利用X 射线衍射(XRD)分析了Co(OH)2 纳米线的结构, 通过循环伏安、恒流充放电和交流阻抗测试了电极的电化学电容性能. 结果表明: Co(OH)2 呈线状生长, 其直径约为300 nm, 长度约为8～10 μm, 密集地生长在泡沫镍骨架上. 电流密度为10 mA·cm-2 时电极的放电比容量高达677 F·g-1, 循环500 次后比容量仍保持在574 F·g-1, 电化学阻抗测试其电荷传递电阻仅为0.23 Ω, 500 次循环后电荷传递电阻仅增加0.03 Ω.

关键词: 无模板法, Co(OH)2 纳米线, 泡沫镍, 形貌, 电化学电容器

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