Hydroxyl covalent organic frameworks integrated on functionalized graphene for enhanced electrochemical energy storage

Abstract

A series of a-rGO@TD-COF hybrid materials were synthesized by adjusting the doping ratio of aniline-functionalized graphene oxide (a-GO) on the surface of which a 2D TAPT-DHTA-COF containing hydrogen bonds was grown in situ. The structure of a-rGO@TD-COFs was characterized by various tests, and their energy storage performance in terms of electrochemistry was studied in detail. Our findings reveal that a-rGO@TD-COF-4 has a specific capacitance of 195 F g⁻¹, which is about two times that of a-rGO (116 F g⁻¹) and thirteen times that of the pristine TAPT-DHTA-COF (15 F g⁻¹). When we put together a symmetric supercapacitor using a-rGO@TD-COF-4, it produced an energy density of 12.2 W h kg⁻¹ at a power density of 500.2 W kg⁻¹. These results show that this kind of hybrid material not only has a combination of the respective advantages of COFs and a-rGO, but also produces a certain synergistic effect between them.