CATALYST-SUPPORTING POROUS SUBSTRATE FOR ELECTROLYSIS, ELECTRODE FOR ELECTROLYSIS, GAS DIFFUSION LAYER, STACK CELL FOR ELECTROLYSIS, AND CELL MODULE FOR ELECTROLYSIS

摘要

The present invention addresses the problem of providing: a catalyst-supporting porous substrate that has a novel configuration (form) and exceptional durability and electrolysis performance in a cell for electrolysis; an electrode for electrolysis; and a stack cell for electrolysis in which the same is used. The problem is solved by providing a catalyst-supporting porous substrate 3, an electrode 2 for electrolysis, a gas diffusion layer in which the same is used, a unit cell 1 for electrolysis, a stack cell 9 for electrolysis, and a cell module 10 for electrolysis. In the catalyst-supporting porous substrate 3: there is a porous substrate 3p on which is supported a catalyst 3c that is present on both sides of a PEM, is in contact with the PEM, constitutes a negative electrode or a positive electrode, and also functions as a gas diffusion layer; the catalyst 3c is supported on the side surfaces of holes in the porous substrate 3p or on the side surfaces of fibers 3q that form the porous substrate 3p, and is present from the surfaces of the porous substrate 3p into the interior; and an ionomer 4 fills the porous substrate 3p from the surface thereof into the interior thereof while being in contact with the catalyst 3c, and has a concentration gradient in the thickness direction of the porous substrate 3p.