Patent ID: 8435695

Claim:
A gas diffusion electrode comprising: a membrane formed of conductive fibers; a layer formed of conductive particles existing while coming into contact with one of surfaces of the membrane; and a catalyst, wherein the membrane formed of the conductive fibers comprises a layer carrying the catalyst and a layer free from carrying the catalyst, the layer carrying the catalyst including a surface of the membrane formed of the conductive fibers on an opposite side of a surface of the membrane formed of the conductive fibers, which is brought into contact with the layer formed of the conductive particles, and wherein a pore ratio of the membrane formed of the conductive fibers is larger than a pore ratio of the layer formed of the conductive particles, wherein the membrane formed of the conductive fibers has spaces having a mode diameter of 10 μm to 100 μm, wherein each of the layer carrying the catalyst of the membrane formed of the conductive fibers, the layer free from carrying the catalyst of the membrane formed of the conductive fibers, and the layer formed of the conductive particles comprises a hydrophobic agent, wherein the layer carrying the catalyst has a thickness of 20 μm or more in a direction perpendicular to the one of the surfaces, and wherein the layer free from carrying the catalyst has a thickness of 50 μm or more in the direction perpendicular to the one of the surfaces.