▎ 摘　　要

NOVELTY - Preparing (M1) a reduced graphene oxide foam, involves: preparing a colloidal suspension of graphene oxide; forming a graphene oxide compact layered film from the colloidal suspension of graphene oxide using flow-directed assembly; and chemically reducing the graphene oxide compact layered film using a chemical reducing agent to form a porous and continuous cross-linked structure that is the reduced graphene oxide foam. USE - For preparing reduced graphene oxide foam, useful in oil absorbent and flexible supercapacitor (claimed). ADVANTAGE - The continuous cross-linked structures not only effectively overcome the restack between graphene sheets, but also possess better conductive contacts between the sheets to lower the resistance of foams. The reduced graphene oxide foams prepared by the leavening strategy effectively overcome the self-agglomeration of graphene sheets without the assistance of any spacers or templates. Since the foams are flexible, such foams having also high surface area and numerous pores can be used to prepare flexible supercapacitors. The reduced graphene oxide foams possess the properties of hydrophobicity, and hence will have superwetting behavior for organic solvents for environmental clean-up. These reduced graphene oxide foams can be used for fabricating supercapacitor devices where neither an insulating binder nor a low capacitance conducting additive is required. Thus the foam supercapacitors are quite stable under bending, and the foams are suitable for the flexible device applications. Compared to the regular reduced graphene oxide layered films, the reduced graphene oxide foams show greatly improved performance as flexible electrode materials for supercapacitors and selective organic absorbents. The ease of fabrication and enhanced performance could make porous reduced graphene oxide foams a general and effective template for designing high performance energy storage or environmental remediation materials. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) an oil absorbent comprising a reduced graphene oxide foam prepared using the method (M1), where the reduced graphene oxide foam is hydrophobic and exhibiting superwetting behavior for organic solvents; and (2) a flexible supercapacitor having a current collector and an electrode, where each of the current collector and the electrode comprising the reduced graphene oxide foam prepared using the method (M1).