A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

A liquid–air interfacial assembly is used to produce a flexible substrate‐supported graphene film, which does not need the tedious substrate‐transfer procedure that is generally required for many other film‐making methods. The graphene film is used as the active working electrode in its planar configuration and an acidic polymer gel is used as the electrolyte, which leads to a flexible planar graphene film supercapacitor with a large areal...