Capacitance performance enhancement of TiO2 doped with Ni and graphite
来源期刊：Rare Metals2009年第3期
论文作者：WANG Honga, TANG Zhiyuana, SUN Leia, HE Yanbinga, WU Yaxiana, and LI Zhongyanb a School of Chemical Engineering and Technology, Tianjin University, Tianjin , China b McNair Technology Co., Ltd., Dongguan , China
文章页码：231 - 236
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.
WANG Honga, TANG Zhiyuana, SUN Leia, HE Yanbinga, WU Yaxiana, and LI Zhongyanb a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China b McNair Technology Co., Ltd., Dongguan 523800, China
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.
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