▎ 摘　　要

NOVELTY - Method for preparing a gas diffusion layer of a proton exchange membrane fuel cell, involves (a) coating a slurry of poly-dopamine grafted micron carbon particles on a surface of a carbon paper by fast printing or coating technology, (b) using graphene oxide sheet, self-assembling on the surface of the carbon paper layer by layer, preparing a graphene oxide thin layer, (c) using nanometer carbon ball slurry, assembling and forming continuous single-layer or multi-layer film on surface of carbon paper, and (d) using polytetrafluoromethane emulsion to process the air diffusion layer to form a thin layer deposition with low surface energy. USE - Preparation method of gas diffusion layer of proton exchange membrane fuel cell (PEMFC) used in power generation technology, energy, automobile and household appliance. ADVANTAGE - The proton exchange membrane fuel cell gas diffusion layer is ultra-thin microporous layer stacking assembly structure. The method is simple, easy operation, suitable for industrial production. The graphene oxide and nano-carbon ball three kinds of material particles are different in geometric characteristic, after coating, forming a gradient change aperture structure, at the same time, using polytetrafluoroethylene to form a hydrophobic structure, using PTFE treatment to form hydrophilic structure, improving gas diffusion water by constructing gradient GDL, gas guiding ability, and improving the electrochemical reaction efficiency. The product carbon paper keeps good mechanical strength which is easy to carry out subsequent processing and surface processing operation. The process is simple in preparation, low in cost and good for mass production.