Preparation of porous carbons from thermoplastic precursors and their performance for electric double layer capacitors
Preparation of porous carbons from thermoplastic precursors and their performance for electric double layer capacitors
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DOI：
10.1016/j.carbon.2006.04.030
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发表时间：
2006-10-01
期刊：
影响因子：
10.9
通讯作者：
Inagaki, Michio
中科院分区：
文献类型：
--
作者：
Morishita, Takahiro;Soneda, Yasushi;Inagaki, Michio
以聚乙烯醇（PVA）、羟丙基纤维素和聚对苯二甲酸乙二酯等热塑性前驱体为原料，在900 ℃惰性气氛下，通过与MgO的混合物的碳化反应，成功地制备了具有高比表面积的多孔炭。碳化后，使用稀硫酸溶解MgO，并分离形成的碳。PVA碳前体与MgO前体（试剂级MgO、乙酸镁或柠檬酸镁）的混合以粉末形式或在水溶液中进行。通过溶液混合获得的炭的BET表面积可以达到非常高的值，例如2000 m2/g，而无需任何活化过程。发现所得碳的孔结构强烈依赖于混合方法;通过溶液混合制备的碳富含中孔，但通过粉末混合制备的碳富含微孔。发现中孔的尺寸与MgO颗粒的尺寸几乎相同，这表明了控制所得碳中的中孔尺寸的方法。在1 mol/LH_2SO_4电解液中进行电容测量。在900 ° C下通过乙酸镁与PVA的溶液混合制备的BET表面积为1900 m2/g的多孔碳显示出相当高的EDLC电容，在20 mA/g的电流密度下约为250 F/g，在1000 mA/g的电流密度下约为210 F/g。速率性能与介孔比表面积密切相关。(c)2006爱思唯尔有限公司保留所有权利。
Porous carbons with high surface area were successfully prepared from thermoplastic precursors, such as poly(vinyl alcohol) (PVA), hydroxyl propyl cellulose and poly(ethylene terephthalate), by the carbonization of a mixture with MgO at 900 degrees C in an inert atmosphere. After carbonization the MgO was dissolved out using a diluted sulfuric acid and the carbons formed were isolated. The mixing of the PVA carbon precursor with the MgO precursors (reagent grade MgO, magnesium acetate or citrate) was done either in powder form or in an aqueous solution. The BET surface area of the carbons obtained via solution mixing could reach a very high value, such as 2000 m(2)/g, without any activation process. The pore structure of the resultant carbons was found to depend strongly on the mixing method; the carbons prepared via solution mixing were rich in mesopores, but those produced via powder mixing were rich in micropores. The size of mesopores was found to be almost the same as that of the MgO particles, suggesting a way of controlling the mesopore size in the resultant carbons. Measurement of capacitance was carried out in 1 mol/L H2SO4 electrolyte. The porous carbon with a BET surface area of 1900 m2/g prepared at 900 degrees C through solution mixing of Mg acetate with PVA showed a fairly high EDLC capacitance, about 250 F/g with a current density of 20 mA/g and 210 F/g with 1000 mA/g. The rate performance was closely related to the mesoporous surface area. (c) 2006 Elsevier Ltd. All rights reserved.