Mechanically Tough Large‐Area Hierarchical Porous Graphene Films for High‐Performance Flexible Supercapacitor Applications

Abstract

Mechanically tough large-area hierarchical porous graphene films are fabricated by blade-casting of graphene oxide hydrogel and postcasting reduction. The as-prepared graphene films, which consist of well-exfoliated graphene nanosheets, possess interpenetrating 3D hierarchical porous structures, high strength and modulus, large specific area, and high electrical conductivity. Flexible film supercapacitors fabricated with the graphene electrodes show superior areal capacitance, good rate performance, and excellent mechanical stability.

Recent advances in flexible supercapacitors based on carbon nanotubes and graphene

“…To address the poor processability of aqueous graphene dispersions, a novel strategy has been developed to prepare graphene films from blade-casted graphene hydrogel [107]. Thin GO hydrogel films prepared by blade-casting on glass substrates were pretreated with piranha solution.…”

Bendable solid-state supercapacitors with Au nanoparticle-embedded graphene hydrogel films

“…In recent years, bendable electrical double layer capacitors—or supercapacitors—have been regarded as one of the most promising energy storage devices, owing to their fast charge/discharge rates and favorable cycle lifetimes when compared with batteries1234. Unlike batteries, which store energy through electrochemical reactions in the electrode bulk, supercapacitors store energy primarily at the interface of the electrode and electrolyte.…”

Engineering Graphenes from the Nano- to the Macroscale for Electrochemical Energy Storage

“…This GO film was then reduced to obtain macropores and mesopores. This porous graphene film was used as the electrode in a flexible supercapacitor and showed a high areal capacitance (~ 71 mF cm −2 in H 2 SO 4 electrolyte) and could be bent to arbitrary angles [56]. Our group analyzed the removal of trapped water in [44].…”