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Hybrid capacitor capable of large increasing capacitance

可大容量增加的混合电容器

基本信息

批准号：
14550692
负责人：
SATO Yuichi
金额：
$ 2.05万
依托单位：
Kanagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Activated carbon has high power density, but has limited specific capacity, if it is used as the electrode materials for double layer capacity. To increase the capacity of activated carbon, ruthenium oxide was loaded into coal-based activated carbon with surface area of 3000 m^2/g in an aqueous RuCl_3 solution followed by neutralization. Although the BET surface area of the activated carbon decreased upon ruthenium oxide loading compared to that of the starting material, its capacitance increased. The maximum capacity obtained in this study was 324 F/g for activated carbon loaded with 3.2 wt% ruthenium, an increase of about 25 %.This unexpected large increase is considered to be due to an introduction of pseudocapacitance of ruthenium oxide and new mesopore formation by oxidation of activated carbon through catalytic action of RuO_2 during the heating process of the composite in air to improve the pore utility for double layer capacitance.In order to increase the double layer capacitance of activated carbon, further study was carried out. Two sorts of conducting material such as Ketjen black(KB) and boron-doped hydrophobic acetylene black(WWAB) are added to activated carbon to construct the electro-conductive network in the electrode and to increase the effective efficiency of activated carbon. The best results are 329 F/g for KB,359 F/g for WWAB, about 27 % for KB, and 39 % for WWAB increase compared to un-added activated carbon respectively. The optimum content is 4 wt% for KB and 9 wt% for WWAB.

活性炭具有较高的功率密度，但用作双电层电容器的电极材料时，其比容量有限。为了提高活性炭的容量，在RuCl_3水溶液中将氧化钌负载到比表面积为3000 m^2/g的煤基活性炭中，然后中和。虽然与起始材料相比，活性炭的BET表面积在负载氧化钌后降低，但其电容增加。对于负载有3.2wt%钌的活性炭，在该研究中获得的最大容量为324 F/g，增加约25%。这种意想不到的大幅增加被认为是由于氧化钌的伪电容的引入以及通过RuO_的催化作用氧化活性炭而形成新的中孔。2.在空气中加热过程中，对活性炭进行改性，以提高双电层电容的孔隙利用率。通过在活性炭中加入两种导电材料，即科琴黑（KB）和硼掺杂疏水乙炔黑（WWAB），在电极中构筑导电网络，提高活性炭的有效效率。最好的结果是KB的329 F/g，WWAB的359 F/g，与未添加的活性炭相比，KB的约27%和WWAB的39%分别增加。KB和WWAB的最佳含量分别为4wt%和9wt%。