Enhanced capacitance of carbon nanotubes through chemical activation
Enhanced capacitance of carbon nanotubes through chemical activation
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DOI：
10.1016/s0009-2614(02)00684-x
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发表时间：
2002-07-24
影响因子：
2.8
通讯作者：
Béguin, F
中科院分区：
文献类型：
--
作者：
Frackowiak, E;Delpeux, S;Béguin, F
纯多壁碳纳米管（MWNTs）的微孔性已高度开发使用化学KOH活化。取决于纳米管材料，在活化过程之后烧除的范围为20%至45%。表面积至少增加了两倍，ca的最大值。对于4：1的KOH/C比率，1050 m2/g。活化的材料仍然具有纳米管形态，在外壁上具有许多缺陷，这些缺陷使纳米管体积显著增加，同时保持明显的中孔性。这种活化的MWNTs已被用作碱性、酸性和非质子介质中的超级电容器的电极材料。在活化后总是观察到电容值的增强：在某些情况下，它从15 F/g（对于未活化的纳米管）增加到90 F/g（在化学活化后）几乎七倍。(C)2002 Elsevier Science B. V.保留所有权利。
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.