Patent ID: 7883817

Claim:
A method for producing a gas diffusion electrode comprising at least a catalyst layer including a carbon powder carrying an electrode catalyst and a cation exchange resin, said method comprising: a mixture preparation step for preparing a catalyst layer-forming mixture containing said carbon powder carrying an electrode catalyst, said cation exchange resin, and a liquid containing an alcohol capable of dissolving or dispersing said cation exchange resin and having a vapor pressure at 20° C. of 0.6 to 12.3 kPa; and a catalyst layer forming step for forming said catalyst layer on a support sheet using said mixture, wherein: in said catalyst layer forming step, organic substance comprising at least one of said alcohol, a partial oxide of said alcohol, a product of intramolecular dehydrogenation reaction of said alcohol, a product of intermolecular condensation reaction of said alcohol, a product of intermolecular condensation reaction between said alcohol and said partial oxide, and a product of intermolecular condensation reaction of said partial oxide is removed, whereby a rate [mass %] of said organic substance which remains in said catalyst layer is adjusted to satisfy the following equation (1): {100× A 1 /( E 1 +G 1 )}≦50.05 (1), where A 1 represents a total mass of said organic substance, E 1 represents a total mass of said carbon powder and G 1 represents a total mass of said cation exchange resin, and said method further comprises a packing and preserving step for packing a laminate comprising said support sheet and said catalyst layer obtained in said catalyst forming step or said catalyst layer obtained by peeling off said support sheet from said laminate into a hermetically sealed container and preserving it until initial use.