Low-cost production of mesoporous carbon/carbon composite cryogels
Low-cost production of mesoporous carbon/carbon composite cryogels
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DOI：
10.1016/j.carbon.2011.04.018
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发表时间：
2011-09-01
期刊：
影响因子：
10.9
通讯作者：
Tamon, Hajime
中科院分区：
文献类型：
--
作者：
Kraiwattanawong, Kriangsak;Sano, Noriaki;Tamon, Hajime
将棉纤维（CF）分散在间苯二酚-甲醛（RF）溶胶中，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。将CF与RF的质量比从0%提高到25%，观察在选定的RF合成条件下C/C复合材料的介孔结构变化。采用氮吸附法和汞孔法对多孔结构进行了表征，并用扫描电镜（SEM）对其结构进行了观察。随着CF含量的增加，C/C复合材料的中孔直径略有增大。与不加CF的碳冷冻液相比，该制备可以增加中孔体积，降低生产成本。SEM图像显示，经过冷冻干燥步骤后，出现了纳米多孔凝胶球。这些球被转化为纳米孔碳球，周围有纳米笼，CF同时被热解转化为碳纤维。(C) 2011 Elsevier Ltd.版权所有。
A carbon/carbon (C/C) composite cryogel was prepared by dispersing cotton fibers (CF) in a resorcinol and formaldehyde (RF) sol, followed by solvent exchange with t-butanol, freeze drying and pyrolysis under inert atmosphere. The mass ratio of CF to RF was increased from 0% up to 25% to observe the mesopore structure change of C/C composites under a selected RF synthesis condition. The porous structures were characterized by nitrogen adsorption and mercury porosimetry, and their structure was observed by a scanning electron microscope (SEM). The mesopore diameter of the C/C composites increases slightly with the increase of CF content. The preparation can increase the mesopore volume and also reduce the production cost compared with carbon cryogels prepared without CF. The SEM images show that nanoporous gel spheres appeared after the freeze drying step. These spheres are converted to be nanoporous carbon spheres with surrounding nanocages, and CF are converted into carbon fibers at the same time by pyrolysis. (C) 2011 Elsevier Ltd. All rights reserved.