梧桐皮基高比表面积碳材料的制备及其超电容性能

Preparation of porous carbon with high specific surface area derived from plane tree bark and its supercapacitance characteristics

以废弃的梧桐皮为原料、KOH为活化剂,采用二次活化法制备了高比表面积碳材料,对样品进行了扫描电镜(SEM)和氮气吸脱附表征,并利用循环伏安以及恒电流充放电研究了样品的超电容性能。研究结果表明,当活化剂与梧桐皮的质量比为3:1时,样品的比表面积达到最大(2141m2·g-1),电化学性能最佳。当电流密度为1A·g-1时,其最大比电容可达344F·g-1,表现出优异的电化学性能。

Porous carbons with high specific surface area were prepared, wherein waste plane tree bark was used as carbon precursor, KOH was used as active agent. The as-prepared sample was characterized by scanning electron microsco- py,nitrogen isotherm adsorption-desorption measurement, cyclic voltammtetry and constant current charge^discharge. The results indicated when the mass ratio between the active agent and the plane tree bark was 3 ： 1, the sample possessed a large surface area of 2141m2·g-1 and a specific capacitance of about 344F· g-1 at a current density of 1A ·g-1 ,which showed excellent electrochemical performance.