Membrane electrode for hydrogen production by alkaline water electrolysis, method for manufacturing the same, and electrolytic cell

Abstract

The present invention provides a membrane electrode for hydrogen production by alkaline water electrolysis, a method for producing the same, and an electrolytic cell. The manufacturing method according to the present invention is a method of direct coating and hot pressing, which can obtain a membrane electrode in which the catalyst layer is uniform and firmly attached to the surface of the diaphragm, can be given good stability to the membrane electrode, and the obtained membrane electrode has a significantly reduced water electrolysis overpotential. The manufacturing method includes the step of directly coating a catalyst slurry on both sides of a diaphragm, drying it, hot pressing it, and then forming a catalyst layer on each side of the diaphragm to obtain the membrane electrode, wherein the diaphragm is selected from a porous diaphragm or an alkaline anion exchange membrane, the catalyst slurry contains a binder solution and a catalyst, the binder solution is one or more of a perfluorosulfonic acid resin solution and a perfluorosulfonic acid ionomer dispersion, the mass concentration of the binder solution is 5 to 30%, and the mass ratio of the binder solution to the catalyst is 1:1 to 4:1.

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