▎ 摘　　要

NOVELTY - Method of fabricating a graphene oxide film involves (a) suspending a graphene oxide in a first solvent to form a graphene oxide suspension; (b) dispersing the graphene oxide suspension in a second solvent to form a graphene oxide dispersion; (c) reducing the graphene oxide dispersion; (d) filtering the graphene oxide dispersion through a membrane to form a graphene oxide film on the membrane; and (e) freeze-casting the graphene oxide film on the membrane. USE - The method is useful for fabricating a graphene oxide film. ADVANTAGE - The method provides three-dimensional porous reduced graphene oxide films that may avoid the shortcomings of current supercapacitor technology and provides a simple, yet versatile technique for the fabrication of supercapacitors through the direct preparation of three-dimensional porous reduced graphene oxide films by filtration and freeze casting.