Gas diffusion layer with high air permeability, and preparation method thereof

The invention particularly relates to a gas diffusion layer with high air permeability, and a preparation method thereof, and belongs to the technical field of fuel cells. The method comprises the following steps: obtaining an impressing plate, and arranging a channel on the impressing surface of the impressing plate; coating the substrate layer with a microporous layer slurry to obtain a blank to be impressed; impressing the impressing plate on the microporous layer slurry of the blank to be impressed, and then drying to obtain a primary product; and performing heat treatment on the primary product to obtain the gas diffusion layer. The gas diffusion layer with a hydrophobic structure, higher porosity and larger total pore volume is obtained through the method for preparing the groove in the GDL through template imprinting. 本发明特别涉及一种透气性高的气体扩散层及其制备方法，属于燃料电池技术领域，方法包括：获得压印板，所述压印板的压印面设有槽道；将微孔层浆料涂布于基底层，获得待压印坯料；将所述压印板压印于所述待压印坯料的微孔层浆料，后进行干燥，获得初品；将所述初品进行热处理，获得气体扩散层；通过模板压印在GDL上制备沟槽的方法获得具有疏水结构且孔隙率更高，总孔体积更多的气体扩散层。