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

被引:5
|
作者
Xu Wei-Jia [1 ]
Qiu Da-Ping [1 ]
Liu Shi-Qiang [1 ]
Li Min [1 ]
Yang Ru [1 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Electrochem Proc & Technol Mat, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
cork; activated carbon; interconnected pores; supercapacitor; BIOMASS; OXYGEN; CARBONIZATION; ADSORPTION; ELECTRODES; REMOVAL; SUBERIN; STALK; SO2;
D O I
10.15541/jim20180426
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:625 / +
页数:10
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