论文部分内容阅读
以石油焦为前驱体和KOH作为活化剂制备一种用于电化学电容器的高比表面积活性炭,采用廉价弱腐蚀性的Na_2SO_4电解液制备一种高电压的对称活性炭基水系电化学电容器,用N2吸附-脱附仪表征活性炭电极材料的孔结构参数,用循环伏安、恒流充放电和交流阻抗等电化学测试方法研究其电化学性能。研究结果表明,活性炭的比表面积为2855m~2/g,平均孔径为2.31nm;活性炭基水系电化学电容器在1.0mol/L Na_2SO_4电解液中扫描速率为2mV/s的比电容能达到188F/g,在功率密度为200W/kg时能量密度达到19.4Wh/kg,活性炭基水系电化学电容器在电压值为1.6V下展现了良好的循环性能,意味着Na_2SO_4电解液对开发能量密度高和环境友好的电化学电容器有着重要的意义。
A petroleum-based coke was used as activator to prepare a kind of high specific surface area activated carbon for electrochemical capacitor. A kind of high-voltage symmetric activated carbon-based aqueous electrochemical capacitor was prepared by using cheap and weakly corrosive Na_2SO_4 electrolyte. Adsorption - desorption instrument characterization of activated carbon electrode material pore structure parameters, with cyclic voltammetry, constant current charge and discharge and electrochemical impedance spectroscopy electrochemical test methods to study its electrochemical properties. The results showed that the specific surface area of activated carbon was 2855m 2 / g and the average pore diameter was 2.31nm. The specific capacitance of activated carbon-based electrochemical capacitors with a scan rate of 2mV / s in 1.0mol / L Na_2SO_4 electrolyte reached 188F / g , An energy density of 19.4Wh / kg at a power density of 200W / kg and a good cyclic performance of an activated carbon-based aqueous electrochemical capacitor at a voltage of 1.6V means that the Na_2SO_4 electrolyte is highly energy-efficient and environmentally friendly The electrochemical capacitor has important significance.