Toray Industries, Inc.

Junichi Urai

Masamichi Utsunomiya

Yasuaki Tanimura

Yasutaka Okano

Toshiya Kamae

Kazuyo Shigeta

A gas diffusion electrode including: a conductive porous substrate and a microporous layer on at least one side of the conductive porous substrate; in which the total of regions passing through the microporous layer in the thickness direction has an area ratio of 0.1% or more and 1% or less; and in which the microporous layer has a portion that has penetrated into the conductive porous substrate (hereinafter referred to as penetration portion), the penetration portion having a thickness ratio of 30% or more and 70% or less with respect to 100% of the thickness of the microporous layer. The gas diffusion electrode used for fuel cells affords fuel cells having high water removal performance and high power generation performance.

Gas diffusion electrode and fuel cell

A gas diffusion electrode substrate has an electrically conductive porous substrate and a microporous layer-on one side of the electrically conductive porous substrate. The microporous layer-includes a dense portion A and a dense portion B. The dense portion A is a region containing a fluorine resin and a carbonaceous powder having a primary particle size of 20 nm to 39 nm. The dense portion A has a thickness of 30% to 100% with respect to the thickness of the microporous layer-as 100% and a width of 10 &#x3bc;m to 200 &#x3bc;m. The dense portion B is a region containing a fluorine resin and a carbonaceous powder having a primary particle size of 40 nm to 70 nm.

Gas diffusion electrode base, laminate and fuel cell

A gas diffusion electrode includes a porous carbon electrode substrate and a microporous layer(s) provided at least on one surface of the porous carbon electrode substrate. The porous carbon electrode substrate is composed of carbon short fibers bonded with a resin carbide. When the region of the porous carbon electrode substrate, extending from a plane that has a 50% filling rate and is closest to one surface of the substrate to a plane that has the 50% filling rate and is closest to the other surface thereof, is trisected in the through-plane direction to obtain three layers, a layer located closer to one surface has a layer filling rate different from the layer filling rate of the layer located closer to the other surface. The microporous layer has a thickness under an added pressure of 0.15 MPa of from 28 to 45 &#x3bc;m, and has a thickness under an added pressure of 2 MPa of from 25 to 35 &#x3bc;m.

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Otsu, Japan

Junichi Urai