Hybrid capacitor capable of large increasing capacitance

作为双电层容量的电极材料，活性碳具有较高的功率密度，但比容量有限。为了提高活性碳的容量，在RuCl3水溶液中将氧化Ru负载到比表面积为3000m2/g的煤基活性炭中，然后进行中和处理。与原料相比，负载Ru后，活性炭比表面积减小，但比容量增加。负载量为3.2wt%Ru的活性炭的最大比容量为324F/g，增加了约25%。这一意外的大幅增加被认为是由于在复合材料在空气中加热过程中，氧化Ru_2的催化作用，使活性炭氧化形成了新的中孔，从而提高了双电层电容的孔利用率。为了提高活性碳的双电层电容，进一步进行了研究。将凯金黑(KB)和掺硼疏水乙炔黑(WWAB)两种导电材料加入到活性碳中，构建了电极的导电网络，提高了活性碳的有效效率。与未添加活性碳相比，最佳效果分别为：KB提高329 F/g，WWAB提高359 F/g，KB提高约27%，WWAB提高39%。KB和WWAB的最佳用量分别为4wt%和9wt%。

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.