超级电容器用葛根基活性炭的制备及性能研究

以葛根为原料,通过K2CO3/KOH混合碱活化方法制备了高比表面积电极材料活性炭,采用氮气吸-脱附、X射线衍射光谱法(XRD)、恒流充放电以及循环伏安法考察活性炭样品的表面性质、孔结构以及电化学性能,进一步考察了碱活化浓度、活化温度对活性炭的比表面积、孔结构和电化学性能影响。结果表明:活性炭的最佳碱炭比为3∶1,活化温度为800℃,比表面积最高达2700 m2/g,在6 mol/L的KOH电解液中,超级电容器法拉第比电容为325 F/g,具有很好的电化学性能。

Preparation and property of kudzu-based activated carbon for supercapacitor

Kudzu root was used as raw material,and KOH/K2CO3 activation method was used for producing electrode material activated carbon with high specific surface area.Measurements such as N2 adsorption desorption,XRD,constant current charge-discharge techniques and cyclic voltammetry were carried out to investigate specific surface area,pore structure and electrochemical properties.The effect of KOH base concentration and activation temperature on specific surface area,pore structure and electrochemical properties of the activated carbons was investigated.The optimum preparation conditions are determined as follows:the ratio of the activation agent to rice husks being 3∶1,activation temperature being 800℃.The activated carbons have the highest specific surface area of 2700 m2/g.The supercapacitor has a large specific capacitance of 325 F/g in 6 mol/L KOH electrolyte,which means it has very good performance.