物理化学学报 >> 2011, Vol. 27 >> Issue (03): 615-619.doi: 10.3866/PKU.WHXB20110317

电化学和新能源 上一篇    下一篇

泡沫镍负载的NiCo2O4纳米线阵列电极的超级电容性能

于丽秋, 陈书礼, 常莎, 李云虎, 高胤义, 王贵领, 曹殿学   

  1. 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001
  • 收稿日期:2010-10-15 修回日期:2010-11-27 发布日期:2011-03-03
  • 通讯作者: 曹殿学 E-mail:caodianxue@hrbeu.edu.cn
  • 基金资助:

    国家自然科学基金(20973048)和中央高校基金(HEUCF101004)资助项目

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).

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摘要：

采用无模板自然生长法制备了泡沫镍支撑的NiCo2O4纳米线阵列电极, 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超级电容性能. 结果表明: NiCo2O4纳米线直径约为500-1000 nm、长度约为10 μm, 垂直且密集地生长在泡沫镍骨架上. 纳米线阵列电极的放电比容量高达741 F·g-1, 循环420次后比容量仍保持在655 F·g-1, 电化学阻抗测试其电荷传递电阻仅为0.33 Ω, 420次循环后电荷传递电阻仅增加0.06 Ω.

关键词: NiCo2O4, 纳米线阵列, 无模板生长法, 泡沫镍, 超级电容器

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