KOH activation of ordered mesoporous carbons prepared by a soft-templating method and their enhanced electrochemical properties
KOH activation of ordered mesoporous carbons prepared by a soft-templating method and their enhanced electrochemical properties
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DOI：
10.1016/j.carbon.2010.02.005
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发表时间：
2010-06-01
期刊：
影响因子：
10.9
通讯作者：
Nishiyama, Norikazu
中科院分区：
文献类型：
--
作者：
Jin, Jin;Tanaka, Shunsuke;Nishiyama, Norikazu
采用软模板法合成了有序介孔炭（COU-2）。采用KOH对COU-2介孔炭进行活化处理，以提高其孔隙率。COU-2的中孔尺寸为5.5 nm，并且不受KOH活化的影响。但经KOH活化后，COU-2的BET比表面积从694 m2/g增加到1685 m2/g，总孔容从0.54 cm 3/g增加到0.94 cm 3/g。体积的大幅度增加是由于表面积的增加。在水性（1 M硫酸）和有机（1 M四氟硼酸四乙基铵/聚碳酸亚丙酯）电解质溶液中进行电化学循环伏安法测量。KOH活化的COU-2碳在水溶液和有机电解质溶液中均显示出优于COU-2碳和商业微孔碳的上级电容。这些结果表明，在薄孔壁中具有规则互连的均匀中孔和微孔的碳是电化学双层电容器中的电极所期望的。(C)2010爱思唯尔有限公司版权所有。
Ordered mesoporous carbon (COU-2) was synthesized by a soft-templating method. The COU-2 mesoporous carbon was activated by using KOH to improve its porosity. The mesopore size of COU-2 was 5.5 nm and did not change by the KOH activation. But, the BET surface area of COU-2 largely increased from 694 to 1685 m(2)/g and total pore volume was increased from 0.54 to 0.94 cm(3)/g after the KOH activation. The large increase of micropore volume is due to the increase of the surface area. Electrochemical cyclic voltammetry measurements were conducted in aqueous (1 M sulfuric acid) and organic (1 M tetraethyl ammonium tetrafluoroborate/polypropylene carbonate) electrolyte solutions. The KOH-activated COU-2 carbon shows superior capacitances over the COU-2 carbon and a commercial microporous carbon both in aqueous and organic electrolyte solutions. These results suggest that the carbons having regularly-interconnected uniform mesopores and micropores in thin pore walls are desirable for the electrodes in electrochemical double-layer capacitors. (C) 2010 Elsevier Ltd. All rights reserved.