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Pseudo-capacitive Behavior of Cobalt Hydroxide/Carbon Nanotubes Composite Prepared by Cathodic Deposition
Xiao-feng Wang* ,Dian-bo Ruan ,Zheng You
Author NameAffiliation
Xiao-feng Wang* Department of Precision Instruments and Mechanics, Tsinghua University, Beijing 100084, China 
Dian-bo Ruan Department of Precision Instruments and Mechanics, Tsinghua University, Beijing 100084, China 
Zheng You Department of Precision Instruments and Mechanics, Tsinghua University, Beijing 100084, China 
Abstract:
A novel type of composite electrode based on multiwalled carbon nanotubes coated with sheet-like cobalt hydroxide particles was used in supercapacitors. Cobalt hydroxide cathodically deposited from Co(NO3)2 solution with carbon nanotubes as matrix exhibited large pseudo-capacitance of 322 F/g in 1 mol/L KOH. To characterize the cobalt hydroxide nanocomposite electrode, a charge-discharge cycling test, cyclic voltammetry, and an impedance test were done. This cobalt hydroxide composite exhibiting excellent pseudo-capacitive behavior (i.e. high reversibility, high specific capacitance, low impedance), was demonstrated to be a candidate for the application of electrochemical supercapacitors. A combined capacitor consisting of cobalt hydroxide composite as a cathode and activated carbon fiber as an anode was reported. The electrochemical performance of the combined capacitor was characterized by cyclic voltammetry and a dc charge/discharge test. The combined capacitor showed ideal capacitor behavior with an extended operating voltage of 1.4 V. According to the extended operating voltage, the energy density of the combined capacitor at a current density of 100 mA/cm2 was found to be 11 Wh/kg. The combined capacitor exhibited high-energy density and stable power characteristics.
Key words:  Cobalt hydroxide, Carbon nanotubes, Nanocomposite, Cathodic deposition, Supercapacitor
FundProject:
电化学阴极沉积制备氧化钴/CNTs复合电极的准电容特性
王晓峰 ,阮殿波 ,尤政
摘要:
采用电化学阴极沉积还原Co(NO3)2的方法制备了 具有准电容特性的氧化钴电极材料,其比容量达到280 F/g,采 用CNTs作为电极基体,在其表面均匀的沉积了纳米钴化镍颗粒并 由此制备了氧化钴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,CNTs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1 mo
关键词:  氧化钴, CNTs,复合电极,阴极沉积, 复合型超级电容器
DOI:10.1360/cjcp2006.19(6).499.7
分类号: