▎ 摘　　要

NOVELTY - Modified graphene oxide comprises graphene oxide main body, nucleophilic reagent and sodium hydroxide solution as raw material. USE - The modified graphene oxide composite material is useful in proton exchange membrane fuel cell technology field, where the fuel cell is a high-efficiency energy conversion device using hydrogen as raw material, converting chemical energy into electric energy. ADVANTAGE - The modified graphene oxide has excellent hydrophobicity, and can supply water in time and can drain in time under high current density, thus preventing Membrane Electrode Assembliy (MEA) from wetting by water, when the battery is used early, when there is need to wet the water. The GDL can be used in the proton exchange membrane fuel cell for a long period of time. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of modified graphene oxide; (2) a preparation method of composite material; (3) a gas diffusion layer (GDL); and (4) a preparation method of GDL. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of a method of a modified graphene oxide. (Drawing includes non-English language text).