中文摘要：

以废茶叶的炭化料为前驱体，KOH为活化剂（碱炭比1：1、2：1、3：1），在800℃下活化1h制备双电层电容器用活性炭电极材料。利用扫描电镜、低温Nz吸附对活性炭的形貌、孔结构进行表征，采用恒流充放电、循环伏安和交流阻抗等测试方法评价其在3mol／LKOH电解液中的电化学性能。结果表明，3种活性炭比表面积、总孔容和中孔率最高分别达1900rn2／g、0．9194cm^2／g和35．7％；3种活性炭电极材料在0．0556A／g电流密度下的比电容分别为202F／g、255F／g、194F／g，电流密度增加到2．780A／g时，电容保持率分别为84．2％、67．1％、86．6％；等效串联电阻仅为0．10～O．12Q；在碱碳比为2：1时制备的活性炭电极材料在2．363A／g下比电容为148F／g，经1000次循环充放电后，其质量比电容为147．7F／g，电容保持率高达99．3％。

英文摘要：

Activated carbons for electrode materials of electric double layer capacitors have been prepared from the carbonizedmaterials of waste tea-leaves with KOH as activation agent at 800 ℃ for 1 hour. The mass ratios of KOH to carbonized material vary from 1 to 3. The micro-morphology and pore structure of as-prepared activated carbons were investigated using scanning electron mi- croscope and N2 adsorption, respectively. The electrochemical performances were monitored by galvanostatic charge/discharge, cy- clic voltammetry and electrochemical impedance spectroscopy in a two-electrode system with 3 mol/L KOH solution as the electro- lyte. The results show that the largest specific surface area, total pore volume, and mesoporosity of the three carbons reach the ma- ximum of 1 900 m^2/g,0. 919 4 cm^3/g and 35. 7%, respectively. When the three carbons are used as electrode material, they deliver specific capacitance of 202 F/g, 255 F/g and 194 F/g at the current density of 0. 055 6 A/g, respectively. And when the current den- sity increases from 0. 055 6 A/g to 2. 780 A/g, the capacitance retentions are 84. 2% ,67. 1% and 86. 6%, respectively. Meanwhile, the equivalent series resistances of three carbon electrodes are low and vary from 0. 10 Ω to 0. 12Ω. The specific capacitance of the carbon electrode with mass ratio of 2 decreases from 148 F/g to 147. 7 F/g after 1 000 cycles at the current density of 2. 363 A/g, of which the specific capacitance retention is 99. 3 %.