电化学混合电容器用新型聚吡咯/介孔碳纳米复合电极

采用介孔碳CMK-3作为载体,通过化学原位聚合的方法制备出一种新型的聚吡咯/介孔碳(PPy-CMK-3)纳米复合材料.将该纳米复合材料作为正极,配以介孔碳CMK-3为负极和1.0mol·L-1NaNO3中性电解液,组装成为电化学混合电容器.电化学测试表明:在5.0mA·cm-2电流密度和1.4V充放电电位条件下,其放电比容量达57F·g-1,电容器功率密度为2.5×102W·kg-1,能量密度达17Wh·kg-1.当电流密度从5.0mA·cm-2增加至50mA·cm-2时,电容器的容量保持率在80%以上,显示高倍率充放电特性优异.此外,聚吡咯-介孔碳/介孔碳电化学混合电容器易活化,并具有优异的充放电效率和良好的循环稳定性能.

Novel Polypyrrole/Mesoporous Carbon Nanocomposite Electrode for an Electrochemical Hybrid Capacitor

With mesoporous carbon (CMK-3) serving as a support, we prepared a novel nanocomposite of polypyrrole/mesoporous carbon (PPy-CMK-3) by an in situ chemical polymerization method. An electrochemical hybrid capacitor was successfully designed using a PPy-CMK-3 composite and CMK-3 as positive and negative electrodes, respectively. The electrochemical capacitance performance of this kind of hybrid capacitor was investigated in 1.0 mol·L-1 NaNO3 electrolyte solution. The discharge capacity of the hybrid capacitor reached 57 F·g-1 under a current density of 5.0 mA·cm-2 and cell voltage of 1.4 V. The energy density of the hybrid capacitor reached 17 Wh·kg-1 with a power density of 2.5×102 W·kg-1. When the current density was increased from 5.0 to 50 mA·cm-2, the capacity of the hybrid capacitor remained at about 80% and it showed excellent high rate charge-discharge performance. Furthermore, the PPy-CMK-3/CMK-3 hybrid capacitor containing this PPy-CMK-3 nanocomposite could be active easily and it possessed a high charge-discharge efficiency and good cycle performance.