A proton exchange membrane integrated bidirectional gradient porous gas diffusion layer based on in-situ polymerization and a manufacturing method thereof

Abstract

The application discloses an in-situ polymerization-based proton exchange membrane integrated bidirectional gradient porous gas diffusion layer and a manufacturing method thereof, and belongs to the technical field of fuel cells. In the prior art, the interlayer contact loss of the proton exchange membrane is high, the pore distribution is single, and the process is complicated. In the method, photodegradable polymer microspheres PLA-PEG, NaCl crystals, aniline monomers and graphene are dissolved in an N-methyl pyrrolidone solution, and after being mixed sufficiently, a gas diffusion layer coating is obtained; the gas diffusion layer coating is scraped on the surface of a proton exchange membrane substrate; the gas diffusion layer coating on the surface of the proton exchange membrane substrate is irradiated with ultraviolet light; and template removal and activation work are performed on the surface of the proton exchange membrane semi-finished product. The method has the advantages that the porous layer has the functions of a gas diffusion layer and a micro-reaction interface, realizes the triple optimization of gas transmission, electron conduction and water management, and is suitable for high-power-density fuel cell systems.

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