▎ 摘　　要

NOVELTY - A highly conductive hydrophobic gas diffusion layer comprises a porous conductive substrate and a microporous layer, where the porous conductive substrate made of hydrophobically modified graphene, the microporous layer made of modified graphene/carbon material, and the microporous layer is evenly coated on one side of the porous conductive base layer. USE - Highly conductive hydrophobic gas diffusion layer for a fuel cell. ADVANTAGE - The highly conductive hydrophobic gas diffusion layer has strong practicability, high specific surface area of graphene and its strong interaction with carbon materials, low energy consumption and environmental protection, and graphene can be used to coat conductive substrates and conductive carbon materials while being tightly combined with carbon materials to reduce contact resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a highly conductive hydrophobic gas diffusion layer, which involves first adding hydrophobically modified graphene to an organic solvent, and ultrasonic stirring to obtain a hydrophobically modified graphene dispersion with a concentration of 0.1-3.0 mg/mL, immersing the porous conductive base material in the dispersion liquid, taking out and drying after ultrasound, immersing in the dispersion liquid, and repeating the dipping-drying process 2-5 times, finally drying to obtain a porous conductive base material coated with hydrophobically modified graphene, slowly adding conductive carbon material to the hydrophobically modified graphene dispersion, and continuously stirring and ultrasonically dispersing, and slowly adding a binder and stirring sufficiently to obtain a hydrophobically modified graphene/conductive carbon material composite slurry, applying the slurry to one of the hydrophobically modified graphene-coated porous conductive materials by spray coating, blade coating, spin coating, slit extrusion coating, electrospinning, and drying in a vacuum oven at 60-80 degrees C to obtain the finished product.