Effect of activation time on the properties of activated carbons prepared by microwave-assisted activation for electric double layer capacitors

被引：138

作者：

He, Xiaojun ^{[1
]}

Geng, Yejing ^{[1
]}

Qiu, Jieshan ^{[2
]}

Zheng, Mingdong ^{[1
]}

Long, Suan ^{[1
]}

Zhang, Xiaoyong ^{[1
]}

机构：

[1] Anhui Univ Technol, Anhui Key Lab Coal Clean Convers & Utilizat, Sch Chem & Chem Engn, Maanshan 243002, Peoples R China

[2] Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Carbon Res Lab, Dalian 116012, Peoples R China

来源：

CARBON | 2010年 / 48卷 / 05期

关键词：

ELECTROCHEMICAL PERFORMANCE; CHEMICAL ACTIVATION; METAL IONS; SUPERCAPACITORS; ELECTROLYTES; ENERGY; FABRICS; STORAGE; EDLCS; KOH;

D O I：

10.1016/j.carbon.2010.01.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Activated carbons (ACs) were prepared by microwave-assisted heat treatment of petroleum coke with KOH as activation agent, and characterized by infrared spectroscopy and nitrogen adsorption technique with the aim of studying the effect of activation time on the properties of ACs for electrodes in electric double layer capacitors (EDLCs) The electrochemical properties of AC electrodes in EDLCs were studied by cyclic voltammetry, constant current charge-discharge and electrochemical impedance spectroscopy The results show that the specific surface area (S(BET)) and total pore volume of ACs goes through a maximum as the activation time increases At 35 min of the activation time, the as-made AC (denoted as AC-35) has a S(BET) of 2312 m(2)/g With AC-35 as the electrode, its specific capacitance in EDLC at a current density of 50 mA/g can reach 342 8 F/g, and remains at 245 6 F/g even after 800 cycles while the energy density of the capacitor remains at 8 0 wh/kg The results have demonstrated that the microwave-assisted heat treatment is an efficient approach to the preparation of ACs with high performance for EDLCs (C) 2010 Elsevier Ltd All rights reserved

引用

页码：1662 / 1669

页数：8

共 30 条

[1] Effect of microwave and conventional regeneration on the microporous and mesoporous network and on the adsorptive capacity of activated carbons [J].