聚吡咯/氧化石墨烯层状复合材料的制备及其在超级电容器中的应用(英文)

通过将吡咯单体在低温下与氧化石墨烯进行原位聚合,获得聚吡咯/石墨烯(Ppy/CRGO)复合材料.采用场发射电子显微镜(FESEM)、红外(FT-IR)和热重分析(TGA)对复合物的表面形貌、结构进行表征.FESEM结果表明,通过控制氧化石墨烯(GO)和吡咯单体的质量比例,可以对复合物的层状和厚度进行调控.FT-IR和TGA结果表明,聚吡咯(Ppy)是通过化学键合的方式与氧化石墨烯复合在一起.通过机械冷压法将粉末状Ppy/CRGO复合物压成圆片电极,并探讨了石墨烯和聚吡咯复合比例、反应时间、烘干温度和孔隙率等因素对Ppy/CRGO复合物电极的电学和电化学性能的影响.结果表明,Ppy与CRGO质量比为10∶1所制得的Ppy/CRGO复合物的电容量为421 F·g-1,通过在电极中引入孔隙,电容量能进一步提升为509 F·g-1.

Electrochemical Performances of Layered Polypyrrole/Chemically Reduced Graphene Oxide Nanocomposites as Supercapacitor Electrodes

Nanocomposites of polypyrrole(Ppy) and chemically reduced graphene oxide(CRGO),Ppy/CRGO,have been fabricated through in-situ polymerization of pyrrole on graphene oxide(GO) sheets.The as-synthesized Ppy/CRGO composites were characterized complementarily using scanning electron microscopy(SEM),thermogravimetric analysis(TGA) and Fourier transformed infrared spectroscopy(FT-IR).By controlling the initial ratio of the GO to pyrrole,the layered composites could be obtained and their thickness could be tuned properly.The Ppy/CRGO electrodes were prepared using a mechanical compressing technique and their electrical conductivity and electrochemical properties were characterized systematically.We demonstrated that as electrodes for supercapacitor,the Ppy/CRGO composites with Ppy to CRGO mass ratio of 10∶ 1 showed a competitive capacitance of 421 F·g-1 that could be further increased to 509 F·g-1 by introducing pores in it,which is higher than that of Ppy alone.Given the manifest electrical and electrochemical properties,we envisage that the Ppy/CRGO composites should find applications in supercapacitors.