苎麻基活性炭纤维超级电容器材料的制备

Preparation of ramie-based activated carbon fiber and its application in supercapacitors

以天然植物纤维苎麻为原料,采用ZnCl2化学活化法,制备不同活化温度下的活性炭纤维,并组装成超级电容器,通过低温氮气吸附测定了活性炭纤维的BET比表面积和孔结构,发现比表面积随活化温度的升高而减小。电化学测试结果表明经过650℃活化的活性炭纤维超级电容器在50mA/g恒流放电时比电容达253F/g,并且具有较低的内阻和较好的功率特性以及较长的循环寿命。

Activated carbon fiber （ACF） for supercapacitor application was prepared from ramie fiber activated by zinc chloride（ZnCl2） at different activation temperature. The BET specific surface area and pore structure parameters of ACFs were determined by the N2 adsorption-desorption isotherms at 77 K. It is found that BET specific surface area is decreased with the activation temperature. The electrochemical test indicates that ACF activated at 650 ℃ shows higher specific capacitance （253 F/g） under 50 mA/g, lower series resistance, better power capability and longer cycle life.