用于超电容器的高性能活性炭研究

运用化学活化法制备了超电容器用高比表面积活性炭。利用碘吸附、亚甲蓝吸附和BET测试,对样品的孔隙性进行了分析。以制备的活性炭为超电容器电极材料,利用循环伏安和恒流充放电测试其电容特性。结果表明,实验研制的活性炭的比表面积为173m2·g–1,平均孔径为2.36nm,绝大部分孔径都在5nm以内;在10–2A·cm–2的电流密度下活性炭的比容达180F·g–1,基于研制的活性炭的超电容器具有良好的功率特性。

Research on High Performance Activated Carbon for Supercapacitors

High specific surface area activated carbon(AC) for supercapacitors was fabricated by chemical activation method. Iodine adsorption, methylene blue adsorption and BET were used to analyse the as prepared AC. The AC was made into supercapacitor electrode to study its capacitive performance by cyclic voltammetry and galvanostatic charge/discharge. The results show that the prepared AC has a specific surface area of 1733 m2·g–1 and a mean pore diameter of 2.36 nm. The diameter of most pores is smaller than 5 nm. At a current density of 10–2 A·cm–2, a specific capacitance of 180 F·g–1 is reached. Supercapacitors based on the AC have excellent power property.