High rate capability supercapacitors assembled from wet-spun graphene films with a CaCO3 template

Abstract

We fabricated continuous wrinkle-structured graphene film electrodes by a wet-spinning method. The assembled supercapacitors showed an excellent rate performance (79% retention from 1 to 100 A g⁻¹) with a high specific capacitance (177 F g⁻¹ at 1 A g⁻¹). When further functionalized with polyaniline, the electrodes maintained their wrinkled structure and showed an improved rate capability (90% retention from 1 to 100 A g⁻¹) with a superior capacitance as high as 505 F g⁻¹ (1 A g⁻¹).