Guohua Sun
Institute of Coal Chemistry, China
Title: Porous full carbon film of graphene and activated carbon fiber for flexible supercapacitors
Biography
Biography: Guohua Sun
Abstract
Binder-free and free-standing flexible carbon film with a high specific surface and bimodal porous structure was successfully prepared by a facile vacuum-assisted filtration and subsequent annealing process, in which two-dimensional graphene oxide and one-dimensional activated carbon fiber were employed as the basic building blocks. When the mass ratio of activated carbon fiber to graphene oxide was up to 2, the as-prepared flexible film exhibited a high energy density of 20 Wh kg-1 at a power density of 11.3 kW kg-1, with a good rate capability of 63.6% retention from 1 A g-1 to 8 A g-1 and excellent capacitance retention of 94.8% after 2000 cycles in a flexible supercapacitor with 1.0 M Et4NBF4/PC as the electrolyte.Figure 1: Production process of flexible film by controllable filtration and annealing of GO flakes and ACF particles. (Microstructure analyses of GO, ACF and flexible film were obtained by AFM, TEM and SEM techniques, respectively).
