用CVD法合成微米螺旋碳纤维(carbon microcoils, CMCs), 用硝酸和KOH等对其进行纯化和活化处理, 用扫描电镜(SEM)、光学显微镜观察其形貌, 用X--射线能谱仪分析反应后催化剂成分, 并采用恒流充放电、循环伏安、 交流阻抗等电化学方法分析CMCs超级电容器性能。结果表明, 在50 mA•g-1电流密度条件下, 初始CMCs产物的比电容为12.7 F•g-1, 纯化处理后的比电容为41.4 F•g-1, 活化处理后则达到111.1 F•g-1, 为处理前的8.75倍。表明纯化特别是活化处理使其电容性能显著提高。
Carbon microcoils (CMCs) were prepared by CVD, and then were purified and activated with nitric acid and KOH. The morphology of CMC samples with their catalyzer were characterized by means of scanning electron microscope, optical microscope and X-ray spectrometer, respectively. CMCs supercapacitors were characterized by charge-discharge, cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The results show that in the current density of 50 mA·g-1, the electrochemical capacity of no-disposed CMCs, purification CMCs and activation CMCs are 12.7 F·g-1, 41.4 F·g-1 and 111.1 F·g-1 (about 8.75 times before the disposed), respectively. It can be concluded that the capacity of CMCs supercapacitors can be improved by purification and activation.
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