Capacitance performance enhancement of TiO_2 doped with Ni and graphite  

作　　者：WANG Hong TANG Zhiyuan SUN Lei HE Yanbing WU Yaxian LI Zhongyan 

机构地区：[1]School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China [2]McNair Technology Co., Ltd., Dongguan 523800, China

出　　处：《Rare Metals》2009年第3期231-236,共6页稀有金属（英文版）

摘　　要：Nano-amorphous TiO2 was prepared by a sol-gel method. The results of X-ray diffraction （XRD） and scanning electron microscopy （SEM） show that the composite electrode material （TiO2-NiO-C） is made of powder with a grain size of 36.2 nm. Doping of nickel and graphite can increase the electrical conductivity and the specific surface area of nano-amorphous TiO2. The electrochemical properties of TiO2-NiO-C, such as self-discharge, leakage current, and cycle life, were studied using cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS）, and charge-discharge test. With a charge-discharge current density of 500 mA/g, the specific capacity of the TiO2-NiO-C composite material reaches 12.88 mAh/g. Also, the expense of capacity is only 3.88% after 500 cycles. The electrochemical capacitor with the electrode material of TiO2-NiO-C shows excellent capacity and cycling performance.Nano-amorphous TiO2 was prepared by a sol-gel method. The results of X-ray diffraction （XRD） and scanning electron microscopy （SEM） show that the composite electrode material （TiO2-NiO-C） is made of powder with a grain size of 36.2 nm. Doping of nickel and graphite can increase the electrical conductivity and the specific surface area of nano-amorphous TiO2. The electrochemical properties of TiO2-NiO-C, such as self-discharge, leakage current, and cycle life, were studied using cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS）, and charge-discharge test. With a charge-discharge current density of 500 mA/g, the specific capacity of the TiO2-NiO-C composite material reaches 12.88 mAh/g. Also, the expense of capacity is only 3.88% after 500 cycles. The electrochemical capacitor with the electrode material of TiO2-NiO-C shows excellent capacity and cycling performance.

关 键 词：electrochemical capacitor metal oxide sol-gel method TIO2 

分 类 号：O643.36[理学—物理化学] TM53[理学—化学]