Gas diffusion electrode and fuel cell
AssigneeToray Industries, Inc.
InventorsKazuyo Shigeta, Masamichi Utsunomiya, Yasutaka Okano, Yasuaki Tanimura, Toshiya Kamae
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Abstract
A gas diffusion electrode in which a microporous layer is provided on at least one surface of a conductive porous substrate, wherein the areas obtained by dividing the cross section perpendicular to the plane of the microporous layer into three equal parts in the thickness direction are a first area, a second area, and a third area, with respect to the conductive porous substrate side, the fluorine strength of the third area being 0.8 to 1.2 times the fluorine strength of the second area.
Claims8
A gas diffusion electrode comprising a microporous layer on at least one surface of an electrically conductive porous substrate, wherein
- provided that regions obtained by dividing a cross-section perpendicular to the surface of the microporous layer into three equal parts in a thickness direction are a first region, a second region and a third region from a side of the electrically conductive porous substrate, the fluorine intensity of the third region is 0.8 to 1.2 times the fluorine intensity of the second region,
- wherein the microporous layer contains a fluororesin and electrically conductive fine particles,
- wherein the microporous layer has a two-layer structure such that a first microporous layer is on the electrically conductive porous substrate side and a second microporous layer is on the surface side of the microporous layer, and
- wherein the content of the fluororesin in a second microporous layer coating material of the second microporous layer is smaller than the content of the fluororesin in a first microporous layer coating material of the first microporous layer,
- wherein the microporous layer contains carbon black, the carbon black in the third region has a structure index of less than 3.0, and the carbon black in the first region has a structure index of 3.0 or more.
A gas diffusion electrode comprising a microporous layer on at least one surface of an electrically conductive porous substrate, wherein
- provided that regions obtained by dividing a cross-section perpendicular to the surface of the microporous layer into three equal parts in a thickness direction are a first region, a second region and a third region from a side of the electrically conductive porous substrate, the fluorine intensity of the third region is 0.8 to 1.2 times the fluorine intensity of the first region,
- wherein the microporous layer contains carbon black, the carbon black in the third region has a structure index of less than 3.0, and the carbon black in the first region has a structure index of 3.0 or more.
Dependencies are inferred from the claim text.