Toray Industries, Inc.

Takashi Ando

Toru Sugahara

Katsuya Sode

Masamichi Utsunomiya

Takashi Chida

Toshiya Kamae

Yasuaki Tanimura

A porous carbon sheet includes a carbon fiber and a binding material, wherein when in a measured surface depth distribution, a ratio of an area of a portion having a depth of 20 &#x3bc;m or less in a measured area of one surface is a surface layer area ratio X, and a ratio of an area of a portion having a depth of 20 &#x3bc;m or less in a measured area of another surface is a surface layer area ratio Y, the surface layer area ratio X is larger than the surface layer area ratio Y, and a difference between the surface layer area ratios is 3% or more and 12% or less.

Carbon sheet, gas diffusion electrode substrate and fuel cell

The purpose of the present invention is to provide a carbon sheet that is suitably employed in a gas-diffusion-electrode substrate that has excellent flooding resistance and with which it is possible to suppress internal peeling of the carbon sheet. In order to achieve the aforementioned purpose, the present invention has the following configuration. Specifically, provided is a porous carbon sheet containing carbon fibers and a binder, wherein, in a section between a surface on one side of the carbon sheet and a surface on the other side thereof, when layers obtained by dividing, under compression, the carbon sheet into six equal parts in the thickness direction are assumed to be layer, layer, layer, layer, layer, and layer, in order starting from the layer including the surface on the one side to the layer including the surface on the other side, the layer in which the packing ratio under compression is the greatest is layer, and the relationships of the packing ratios under compression among layer, layer, layer, layer, and layerare such that layerhas the greatest packing ratio, and layerhas the second-greatest packing ratio.

Carbon sheet, gas diffusion electrode substrate, wound body, and fuel cell

A porous carbon sheet contains carbon fiber and a binder, wherein the carbon sheet is characterized in that in a section from a plane having a 50% filling ratio closest to one surface to a plane having a 50% filling ratio closest to the other surface, when letting layer X be a layer with the largest filling ratio close to the one surface, layer Y be a layer with a filling ratio smaller than layer X close to the other surface, and layer Z be the layer positioned between layer X and layer Y for layers obtained by dividing the carbon sheet equally into three in a direction perpendicular to the surfaces, the filling ratio for the layers becomes smaller in order of layer X, layer Y, and layer Z.

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Otsu, Japan

Takashi Ando