▎ 摘　　要

NOVELTY - A graphene oxide-carbon complex comprises an oxidized graphene, a porous structure comprising a polymer comprising a cationic functional group, and carbon contained in portion(s) of surface of the porous structure or pores of the porous structure. USE - Graphene oxide-carbon complex is used for lithium secondary battery, membrane electrode assembly of fuel cell (all claimed), and capacitor. ADVANTAGE - The graphene oxide-carbon complex has large surface area. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of graphene oxide-carbon complex; and (2) membrane electrode assembly, which comprises an electrode catalyst layer comprising the graphene oxide-carbon complex.