Enhanced capacitance of carbon nanotubes through chemical activation

被引:228
|
作者
Frackowiak, E
Delpeux, S
Jurewicz, K
Szostak, K
Cazorla-Amoros, D
Béguin, F [3 ]
机构
[1] Poznan Univ Technol, Inst Chem & Tech Electrochem, PL-60965 Poznan, Poland
[2] Univ Alicante, Dept Quim Inorgan, E-03080 Alicante, Spain
[3] Univ Orleans, CNRS, Ctr Rech Mat Divisee, F-45071 Orleans, France
关键词
D O I
10.1016/S0009-2614(02)00684-X
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
Microporosity of pure multi-walled carbon nanotubes (MWNTs) has been highly developed using chemical KOH activation. Depending on the nanotubular material, the burn-off ranged from 20% to 45% after the activation process. At least twofold increase of surface area has been obtained with maximum values of ca. 1050 m(2)/g for KOH/C ratio of 4:1. The activated material still possesses a nanotubular morphology with many defects on the outer walls that give a significant increase of micropore volume, while keeping a noticeable mesoporosity. Such activated MWNTs have been used as electrode material for supercapacitors in alkaline, acidic and aprotic medium. Enhanced values of capacitance were always observed after activation: in some cases it increased almost seven times from 15 F/g (for non-activated nanotubes) to 90 F/g (after chemical activation). (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:35 / 41
页数:7
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