Preparation, structural characterization, and electrochemical properties of chemically modified mesoporous carbon
Preparation, structural characterization, and electrochemical properties of chemically modified mesoporous carbon
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DOI：
10.1016/j.micromeso.2006.07.021
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发表时间：
2006-11-26
影响因子：
5.2
通讯作者：
Wang, Ruoding
中科院分区：
文献类型：
--
作者：
Li, Hongfang;Xi, Hong' an;Wang, Ruoding
采用易氧化法制备了一系列化学修饰有序介孔碳材料(FC-x，x=0，0.5，1.0，1.5，2.0，3.0)。傅里叶变换红外光谱研究表明，随着氧化处理时间的延长，-COOH和C-OH等官能团的含量增加。小角X射线衍射图和透射电子显微镜都证实了表面氧化后有序的介观结构被保留下来。氮气吸附测试表明，随着氧化时间的延长，碳材料的比表面积和孔径先增大后减小。经化学修饰的有序介孔碳材料比未经酸处理的CMK-3具有更好的电容性能。引入的官能团产生了假电容，导致比电容增加。处理1.5h的碳材料具有最高的高倍率容量。在1 mV S(-1)的扫描速率下，比电容达到250Fg(-1)。(C)2006 Elsevier Inc.保留所有权利。
A series of chemically modified ordered mesoporous carbon materials (FC-x, x = 0, 0.5, 1.0, 1.5, 2.0, and 3.0) were prepared by an easy oxidation method in nitric acid aqueous solution. Fourier transform infrared spectroscopy study indicated that the content of the functional groups, such as -COOH and C-OH, increased as a function of oxidation treatment time. Both small-angle X-ray diffraction patterns and transmission electron micrographs confirmed that the ordered mesostructures were preserved after surface oxidation. Nitrogen adsorption measurement showed that the specific surface area and pore size of the carbon materials first increased and then decreased when the oxidation time was longer. The chemically modified ordered mesoporous carbon materials showed better capacitance performance than that of the CMK-3 without acid treatment. The introduced functional groups produced pseudo-capacitance, which resulted in an increase in specific capacitance. The carbon materials treated for 1.5 h showed the highest high-rate capacity. The specific capacitance reached similar to 250 F g(-1) at a scan rate of 1 mV s(-1). (c) 2006 Elsevier Inc. All rights reserved.