椰壳活性炭孔结构的调节及对超电容性能的影响  

Adjustment of Pore Structure of Coconut Shell Activated Carbon and Its Influence on the Performance of Supercapacitors

作　　者：晏荣伟 侯博[1] 夏靳松 杨硕 余凤 陈永[1] YAN Rong-wei;HOU Bo;XIA Jin-song;YANG Shuo;YU Feng;CHEN Yong(State Key Laboratory of South China Sea Marine Resource Utilisation,Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources,College of Materials Science and Chemical Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学材料与化工学院,海南省硅锆钛资源综合开发与利用重点实验室,南海海洋资源利用国家重点实验室,海口570228

出　　处：《人工晶体学报》2018年第3期550-555,563,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51362009,51162006);海南省重点项目(ZDXM2015118);国际科技合作专项(KJHZ201542);中央引导地方科技发展专项资金项目(ZY2〇16HN〇7)

摘　　要：以椰壳为原料采用化学活化法制备活性炭,通过改变碱炭比,得到不同比表面积和孔结构的活性炭材料,并进行机理研究。其中,高比表面积产生大量容量;大量介孔为离子快速转移提供通道,有利于提高超电容的倍率性能。以6 mol·L-1的KOH为电解液组装成对称电极的超级电容器,并进行电化学性能测试。制备的AC-4活性炭比表面积为3831 m2·g-1,介孔率42.8%,组装为超级电容器在1 A·g-1电流密度下放电比容量达到260 F·g-1,100 A·g-1时仍保持216.116 F·g-1,最高功率密度24.5 k W·kg^(-1),能量密度13.35 Wh·kg^(-1)。Porous carbon with different specific surface area and pore structure were prepared from coconut shells by changing the ratio of KOH to carbon.Among them,Specific surface area and mesopores respectively promoting capacity and providing a rapid transfer of ions channels.It was found that the mesopores playing an important role in enhancing the rate ability.Two-electrode supercapacitors with porous carbon electrodes were assembled using KOH aqueous solution(6 mol·L-1)as the electrolyte.The specific surface area of AC^l-is 3831 m2·g-1 and a ratio of mesopore to total pore volume is 42.8%.The supercapacitors were assembled with the sample AC4 have a high capacitance of 260 F·g-1 at 1 A·g-1 and 216.116 F·g-1 at 100 A·g-1.Moreover,a high power density of 24.5 kW·kg-1 and energy density 13.35 Wh·kg-1 were achieved on the sample AC-4.

关 键 词：超级电容器 椰壳 活性炭 比表面积 

分 类 号：TG53[金属学及工艺—金属切削加工及机床]