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Pseudocapacitive Behavior of Nickel Oxide/Carbon Nanotubes Composite Prepared by Cathodic Deposition
Wang Xiaofeng*1, Ruan Dianbo1, Liang Ji2
1.Department of Precision Instruments and Mechanics, Tsinghua University, Beijing100084;2.Department of Mechanical Engineering, Tsinghua University, Beijing100084
Abstract:
A novel type of composite electrode based on multiwalled carbon nanotubes coated with nano nickel oxide particles has been used in supercapacitors. Nickel oxide cathodically deposited from Ni(NO3)2 solution with carbon nanotubes as the matrix exhibited large pseudocapacitance of 25F/g in 6 mol/L KOH. The morphology of composites was examined by scanning electron microscope (SEM). To characterize the CNTs/nickel oxide composite electrode, a charge discharge cycling test for measuring specific capacitance, cyclic voltammetry, and ac impedance test is executed. The nickel oxide composite exhibiting excellent pseudocapacitive behavior(i.e.high reversibility, high specific capacitance, and low self discharge rate) has been demonstrated to be a potential candidate for the application of electrochemical supercapacitors.
Key words:  Nickel oxide, Carbon nanotubes, Supercapacitor, Nanocomposite electrode, Cathodic deposition
FundProject:
电化学阴极沉积制备氧化镍/碳纳米管复合电极的准电容特性
王晓峰*1, 阮殿波1, 梁吉2
1.清华大学精密仪器与机械学系, 北京 100084;2.清华大学机械系, 北京100084
摘要:
采用催化裂解的方法制备了碳纳米管,其比容量为12 F/g.采用碳纳米管作为电极基体,采用阴极电化学还原Ni(NO3)2的方法在碳纳米管基体表面均匀的沉积了纳米氧化镍颗粒并由此制备了氧化镍碳纳米管复合电极材料.采用循环伏安、恒流充放电、交流阻抗及扫描电镜等方法考察了复合电极材料的容量特性、阻抗特性、自放电特性以及电极表观特征.实验表明复合电极具有良好的电化学特性,碳纳米管基体在明显降低氧化镍材料的阻抗的同时还提高了电极材料的电化学容量并拓宽了电极材料的有效工作电位窗,复合电极在6 mol/L KOH电解液中
关键词:  氧化镍  碳纳米管  超电容器  纳米复合电极  阴极沉积
DOI:10.1088/1674-0068/18/3/421-427
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