以中孔硅分子筛SBA-15为模板,蔗糖为炭源,炭化温度为700℃制备中孔炭材料,利用透射电镜(TEM)和N2吸脱附等温线表征该材料的结构与形貌。以中孔炭材料为超级电容器的电极材料,组装成扣式电容器进行循环伏安、恒流充放电、交流阻抗、漏电流、自放电、循环寿命等电化学测试。结果表明:样品孔结构呈二维六角有序分布;该样品的孔体积为1.88cm3/g,比表面积为1394m2/g,具有典型的中孔结构和集中的中孔分布,它的最可几孔径为3.4nm;制备的中孔炭作电极材料组装的超级电容器有良好的电化学性能,在500mA/g的充放电电流密度下,循环10000次的平均比电容高达95F/g,比容量波动范围仅为-4%-4%。
The templated mesoporous carbon(TMC) was prepared using SBA-15 as a template and sucrose as a carbon source at 700 ℃ carbonized temperature. The structure and morphology of mesoporous carbon were characterized by transmission electron microscopy (TEM) and N2 adsorption-desorption isotherm. The electrochemical properties of mesoporous carbon which was used as the active material of coin supercapacitor were studied by cyclic voltammery, constant current charge-discharge, electrochemical impedance spectroscopy, leakage current, self-discharge, and cycle life measurements. The results show that the sample possesses two-dimensional (2-D) hexagonally ordered mesoporous structure, and the pore volume of the sample is 1.88 cm3/g, the specific surface area is 1 394 m2/g; it possesses mesoporous structure and narrow pore size distribution, the average pore size is 3.4 nm. The supercapacitor has good electrochemical performance, the specific capacitance is 95 F/g at a charge/discharge current density of 500 mA/g after 10 000 cycles, and specific capacitance fluctuates between -4% and 4%.