石墨烯-聚吡咯纳米管杂化材料的制备及电容特性

使用化学连接的方法制备一种石墨烯-聚吡咯纳米管杂化材料。使用扫描电镜、透射电镜、傅里叶变换红外光谱仪、光电子能谱仪以及电化学工作站对产物的形貌、结构以及电容特性进行表征。结果表明,在杂化材料中石墨烯和聚吡咯纳米管分散均匀,在石墨烯与聚吡咯纳米管之间通过酰胺基团形成了共价键连接。此杂化材料在0.3 A.g-1电流密度下的比电容为1 368F.g-1,在1.5 A.g-1电流密度下的比电容为759 F.g-1,在1 000次循环伏安循环后的剩余比电容值为初始比电容值的85.5%,显示出良好的电容特性。

Preparation and Capacitance Properties of Graphene-Polypyrrole Nanotube Hybrid

A graphene-polypyrrole nanotube hybrid is fabricated by chemical hybridization method. Scanning electron microscopy, transmission electron microscopy, fourier-transmission infrared spectroscopy, X-ray photoelectron spectroscopy and electrochemical workstation are used out to characterize the morphology, structure and properties of graphene-polypyrrole nanotube hybrid. The electron microscopy images show that graphene sheets and polypyrrole nanotubes distribute well in the hybrid. The results of spectroscopy analysis confirm the existence of amide group which connects graphene and polypyrrole nanotube in the hybrid. The specific capacitance of the hybrid is 1368 F·g^-1 at a current density of 0.3 A·g^-1 as well as the specific capacitance of 759 F·g^-1 at a current density of 1.5 A·g^-1. In long-term cyclic voltammetry tests, after 1000 cycles, the preserved specific capacitance of the hybrid is 85.5% of its initial specific capacitance, demonstrating a good electrochemical stability. The Nyquist plot of the graphene-polypyrrole nanotube hybrid reveals its good pseudo-capacitance performance.