碱处理对剑麻基活性炭电化学性能的影响

采用剑麻制得生物质碳材料，取部分所得碳材料进行碱处理．借助X射线衍射（XRD）、扫描电子显微镜（SEM）等对材料的结构和形貌进行了表征，并采用三电极体系，通过恒流充放电、循环伏安等方法，对该碳材料的充放电特性和比电容进行考察．恒流充放电测试结果表明，在电流密度为1A·g-1时，未经碱处理样品的电极放电比电容为231．85F·g-1，而经碱处理的样品则增至290．35F·g-1；在其它电流密度下，经碱处理样品的电极放电比电容总是大于未经碱处理的样品，经1000次循环后，样品比电容有所增加，经碱处理的样品具有更好的循环稳定性，且碳碱质量比为7：1时，比电容达到最大．

Electrochemical Performance of Sisal-based Activated Carbon Treated with Alkali

Sisal-based biomass carbon materials were prepared using sisal; and then some as-prepared samples were treated by alkali. The structures and morphologies of the samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）. Electrochemical properties of the carbon material were elucida- ted by cyclic voltammetry,galvanostatic charge-discharge with three-electrode system. The results show that the untreated sample＇s specific capacitance is 231.85 F·g-1 ; while the alkali-treated sample is about 290.35 F. g-1 at 1A·g-1. Further research indicates that the discharge specific capacitance of the alkali-treated sample is always greater than that of the initial sisal-based activated carbon. Furthermore, alkali-treated sample shows good cycle stability and capacitance retainability after 1000 cycles. If the biomass carbon is treated by alkali with the mass ratio of carbon and alkali is 7：1,specific capacitance of the sample reaches the maximum value.