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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (6): 591-599.    下一篇

研究论文

电化学混合电容器用新型β-Ni(OH)2/CNTs纳米复合物

苏岳锋, 吴锋*, 包丽颖, 徐斌, 陈实   

  1. (北京理工大学化工与环境学院 国家高技术绿色材料发展中心 北京 100081)
  • 投稿日期:2007-09-28 修回日期:2007-11-16 发布日期:2008-03-28
  • 通讯作者: 吴锋

A Novel β-Ni(OH)2/CNTs Nano-composite Used in Electrochemical Hybrid Capacitor

SU Yue-Feng; WU Feng*; BAO Li-Ying; XU Bin; CHEN Shi   

  1. (National Development Center of Hi-Tech Green Materials, School of Chemical Engineering & the Environment, Beijing Institute of Technology, Beijing 100081)
  • Received:2007-09-28 Revised:2007-11-16 Published:2008-03-28
  • Contact: WU Feng

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采用水热合成法制备出一种新型β-Ni(OH)2/碳纳米管(CNTs)纳米复合物, Ni(OH)2微晶粒径控制在50～80 nm之间, 与CNTs直径相当, CNTs与Ni(OH)2质量比为1∶15. 将纳米复合物应用于活性炭(AC)/NiOOH电化学混合电容器, 电化学测试表明: 在0.4 A/g电流条件下, 其放电比容量达279 mAh/g, 是β-Ni(OH)2理论容量的96.5%; 当电流密度从0.4 A/g增加至8 A/g时, 电容器的容量保持率在76.5%以上, 高倍率充放电特性优异. 此外, 纳米复合物良好的电化学可逆性使AC/NiOOH电化学混合电容器更易活化, 并具有较高的充放电效率和良好的循环稳定性能.

关键词: 水热合成, β-Ni(OH)2/CNTs纳米复合物, 电化学混合电容器

A novel β-Ni(OH)2/carbon nanotubes (CNTs) nano-composite was prepared by hydrothermal synthesis method in this work. The dimension of the β-Ni(OH)2 grain was controlled between 50～80 nm, as large as the diameter of the CNTs. The mass ratio of the CNTs to Ni(OH)2 was 1∶15. The nano-composite was applied to activated carbon (AC)/NiOOH electrochemical hybrid capacitor and the electrochemical performance of the capacitor was tested. The results showed that the discharge capacity of the nano-composite could reach 279 mAh/g at a 0.4 A/g current density, being about 96.5% of the theoretical capacity for β-Ni(OH)2. When the current density was increased from 0.4 to 8 A/g, the capacity of the hybrid capacitor could remain about 76.5%. The nano-composite showed an excellent high rate charge-discharge performance and furthermore a high electrochemical reversibility. The AC/NiOOH electrochemical hybrid capacitor using this nano-composite could be activated quickly and possessed high charge-discharge efficiency and good cycle performance.

Key words: hydrothermal synthesis, β-Ni(OH)2/CNTs nano-composite, electrochemical hybrid capacitor