NOVELTY - An electrode structure comprises: a rolled graphene film which is wound about a central axis, and a nanomaterial (20a, 20b) dispersed on a surface of the rolled graphene film. A top or bottom surface of the electrode structure has a shape of in a circular form, an elliptical form or a polygonal form. A thickness of the electrode structure is 10-1000 mm, taken along the central axis.    USE - As an electrode structure useful in electric device comprising supercapacitor, secondary battery, fuel cell and solar cell (claimed).    ADVANTAGE - The electrode structure facilitates the diffusion of electrolyte ions as well as having a high electrode density (preferably 0.1-1.5 g per cubic centimeter). The electrode has improved density and has a distribution of pores. The electric device e.g. supercapacitor including electrode structure can control dimension and/or distribution of pores in it so as to increase the diffusion of electrolyte ions; can have high density, and simultaneously, can stably maintain the rolled graphene film structure disposed perpendicular to the current collector. Thus power and energy density can be improved.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an electric device (100) comprising: an electrode (110a, 110b) containing a current collector (10a, 10b), and the electrode structure on the current collector; and    (2) manufacturing electrode structure, involving: providing a graphene oxide film comprising a nanomaterial dispersed on its surface; winding the graphene oxide film about a central axis; separating a portion of the wound graphene oxide film from a remainder of the wound graphene oxide film; and reducing the separated portion of the wound graphene oxide film.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the electrode of supercapacitor.    Current collector (10a, 10b)    Nanomaterial (20a, 20b)    Separator (30)    Supercapacitor electric device (100)    Electrode (110a, 110b)