用于高性能超级电容器电极的栓皮栎基多孔活性炭的制备  

Preparation of Cork-derived Porous Activated Carbon for High Performance Supercapacitors

作　　者：许伟佳[1] 邱大平 刘诗强 李敏[1] 杨儒[1] XU Wei-Jia;QIU Da-Ping;LIU Shi-Qiang;LI Min;YANG Ru(Beijing Key Laboratory of Electrochemical Process and Technology for Materials,The State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学材料电化学过程与技术北京市重点实验室化工资源有效利用国家重点实验室

出　　处：《无机材料学报》2019年第6期625-632,I0001-I0002,共10页Journal of Inorganic Materials

基　　金：国家自然科学基金(51372012,51432003)~~

摘　　要：本研究以空腔细胞组成的栓皮栎为原料,KOH为活化剂制备了具有多孔结构的栓皮栎软木基多孔活性炭。以此方法制得的活性炭呈薄片状外形,最大比表面积达到2312m^2/g,具有特殊的微孔?介孔结构。在呈碱性的KOH三电极体系中,0.1A/g电流密度时比电容达296F/g;两电极体系中,5A/g时的比电容达到201F/g,循环5000次后电容保持率达99.5%。在呈中性的Na2SO4两电极体系中,电流密度0.5A/g(174F/g)至50A/g(140F/g)时电容保持率达80.5%,倍率性能良好,能量密度高达19.62Wh/kg。The quercus variabilis cork made up of cavity cells is used as raw material. Herein, the cork-derived activated carbon with the various pores was successfully prepared by the facile carbonization of cork followed by chemical activation. The as-prepared activated carbon sheets possess large specific surface area (2312 m^2/g) and unique interconnected pores. As a result, it shows excellent electrochemical performance as electrode material for supercapacitors. In three electrode system of KOH, it exhibits a high specific capacitance of 296 F/g at a current density of 0.1 A/g. The assembled symmetric supercapacitor shows a high specific capacitance of 201 F/g at 5 A/g, with a good cycling stability of 99.5 % capacitance retention after 5000 cycles. In two electrode system of Na2SO4, the symmetric supercapacitor displays a good rate performance of 80.5% retention from 0.5 A/g (174 F/g) to 50 A/g (140 F/g) and a high energy density of 19.62 Wh/kg.

关 键 词：软木 活性炭 互联孔结构 超级电容器 

分 类 号：O613[理学—无机化学]