Hybrid capacitor capable of large increasing capacitance

活性炭具有较高的功率密度，但比容量有限，如果用作双层容量的电极材料。为了提高活性炭的容量，将氧化钌装入表面积为3000 m^2/g的煤基活性炭中，并在RuCl_3水溶液中进行中和。负载氧化钌后，活性炭的BET比表面积减小，但电容增大。在本研究中，负载3.2% wt%钌的活性炭的最大容量为324 F/g，提高了约25%。这一意想不到的大幅增长被认为是由于在空气中加热复合材料的过程中，引入了氧化钌的赝电容和通过RuO_2的催化作用，活性炭氧化形成了新的介孔，以提高双层电容的孔隙利用率。为了提高活性炭的双层电容，进行了进一步的研究。在活性炭中加入两种导电材料Ketjen black（KB）和硼掺杂疏水乙炔black(WWAB)，在电极中构建导电网络，提高活性炭的有效效率。与未添加活性炭相比，最佳效果是KB提高329 F/g， WWAB提高359 F/g， KB提高27%，WWAB提高39%。KB的最佳含量为4 wt%， WWAB的最佳含量为9 wt%。

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.