活化和MnO_2沉积提高碳纳米管超级电容器的性能

Enhanced performance of carbon nanotubes supercapacitors by activation and MnO_2 deposition

为了提高碳纳米管( carbon nanotubes,CNTs)超级电容器的性能,分别对 CNTs进行活化处理增大其比表面积和在CNTs表面沉积MnO2 引进赝电容,并利用TEM、BET、循环伏安和恒流充放电测试对实验样品进行了分析和表征。结果表明活化和MnO2 沉积有效地提高了 CNTs 超级电容器的性能。在充放电电流密度为 5mA/cm2 时,在 CNTs 的比容为46F/g的情况下,活化 CNTs和 CNTs/MnO2 复合物的比容分别达到87和150F/g,而且基于活化CNTs和CNTs/MnO2 复合物的超级电容器具有良好的功率特性。

In order to enhance the performance of carbon nanotubes (CNTs) supercapacitor, two methods were used. One was to activate the CNTs to increase its specific surface area. The other was to coat the CNTs with MnO2 to introduce pseudocapacitance. The samples were analyzed by TEM, BET, cyclic voltammetry and gal-vanostatic charge/discharge. The results show that activation and MnO2 deposition can enhance the performance of the CNTs supercapacitors effectively. At a current density of 5 mA/cm2, the specific capacitance of CNTs was 46 F/g, while the activated CNTs and CNTs/MnO2 composite reach a specific capacitance of 87 F/g and 150 F/g, respectively. And supercapacitors based on activated CNTs and CNTs/MnO2 composite keep fairly excellent power performance.