Capacitive performance of binder-free carbon/carbon composite cryogels
Capacitive performance of binder-free carbon/carbon composite cryogels
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DOI：
10.1016/j.micromeso.2012.08.022
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发表时间：
2013-01-01
影响因子：
5.2
通讯作者：
Tamon, Hajime
中科院分区：
文献类型：
--
作者：
Kraiwattanawong, Kriangsak;Sano, Noriaki;Tamon, Hajime
将间苯二酚-甲醛（RF）溶胶倒入装棉纤维的小瓶中，与丁醇交换溶剂，在惰性气氛下进行冷冻干燥和热解，制备了碳/碳（C/C）复合低温凝胶。用氮气吸附法分析了C/C复合材料的多孔性，并用扫描电镜观察了其介孔结构。采用恒流充放电法和循环伏安法分析了C/C复合材料的电容性能。结果表明，随着棉纤维添加量的增加，C/C复合材料的电容量增加，这是因为C/C复合材料的微孔尺寸分布更宽，碳通道更大，促进了孔隙结构内电荷的传播。为了获得高电容值，合适的孔隙结构和碳通道可以发挥与高表面积相关的关键作用。(C) 2012爱思唯尔公司版权所有。
A carbon/carbon (C/C) composite cryogel was prepared by pouring a resorcinol-formaldehyde (RF) sol into vials containing cotton fibers, followed by solvent exchange with t-butanol, freeze drying and pyrolysis under inert atmosphere. The porous properties of C/C composites were analyzed by nitrogen adsorption, and their mesopore texture was observed by a scanning electron microscope. The capacitive performance of C/C composites was also analyzed by galvanostatic charge/discharge method and cyclic voltammetry. The results demonstrate that the capacitance can be increased with the increase of amount of cotton fibers added to C/C composites, because the broader micropore size distribution and the carbon tunnels of C/C composites promote the charge propagation inside the pore structure. The suitable pore texture and the carbon tunnels can play the crucial role relevant to the high surface area in order to obtain the high capacitance value. (C) 2012 Elsevier Inc. All rights reserved.