Method for producing slurry for forming fine pore layer and gas diffusion layer containing fine pore layer produced by the same

摘要

The present invention uses a water based wet dispersion agent having an acid value of 5 mgKOH / g or more and an amine value of 10 mgKOH / g and dilutes the organic solvent into a black solvent and a hydrophobic fluorine resin to produce a slurry for forming a fine porous layer.At this time, the addition amount of the water based wet dispersing agent is adjusted by 5 to 30 parts by weight with respect to 100 parts by weight of the black carbon.According to the present invention, the slurry is coated on at least one surface of a carbon fiber paper and dried to form a fine porous layer in which two independent peaks are generated on a particle size analysis graph, and then two layers are peeled on the particle size analysis graph which is formed by pressing and stacking them. A gas diffusion layer containing a fine porous layer to be generated is produced.In the gas diffusion layer of the present invention, since two independent peaks are generated on the grain size analysis graph, the drain diffusion performance is excellent, and the current value of the concentration polarization curve increases by an equivalent voltage value.