Study on the Supercapacitance Performance of Graphene Oxide-pristine SWNT composites

Abstract:

Graphene Oxide-Pristine SWNT composites were fabricated using graphene oxide(GO) as a surfactant to directly disperse pristine SWNT, followed by a freeze-drying method of the sample. The morphology, structure, component and electrochemical property of the compounds were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical measurements. The results showed that the electrochemical properties of the compounds were significantly improved due to the insertion of SWNTs into a GO matrix. Through changing the ratio between SWNTs and graphene oxide, the sample corresponding to a SWNT ratio of 10% showed the best supercapacitor property. At such a optimized mixing ratio, the specific capacitance of the nanocomposite was 155 F·g-1 at a current of 0.5A·g-1 in the KOH aqueous electrolyte of 6 mol·L-1 , which was 1.9-fold higher than that of pure graphene oxide (81.5F·g-1). These results clearly demonstrate that GO-SWNT composites prepared by our present simple method is very promising for next generation high-performance energy storage devices.