Carbon sheet, gas diffusion electrode substrate and fuel cell
US-2017237079-A1 · Aug 17, 2017 · US
Gas diffusion electrode and fuel cell
US10950868B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10950868-B2 |
| Application number | US-201615777447-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 16, 2016 |
| Priority date | Dec 24, 2015 |
| Publication date | Mar 16, 2021 |
| Grant date | Mar 16, 2021 |
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Abstract
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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.
First claim
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The invention claimed is: 1. 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. 2. 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. 3. The gas diffusion electrode according to claim 1 , wherein the fluorine intensity of the third region is 0.8 to 0.98 times the fluorine intensity of the second region. 4. The gas diffusion electrode according to claim 1 , wherein the fluorine intensity of the third region is 0.8 to 1.0 times the fluorine intensity of the first region. 5. The gas diffusion electrode according to claim 1 , wherein the fluorine intensity of the third region is 0.8 to 1.0 times the fluorine intensity of the second region, and 0.8 to 1.0 times the fluorine intensity of the first region. 6. The gas diffusion electrode according to claim 1 , wherein the fluorine intensity/carbon intensity ratio of the third region is 1.0 to 1.3 times the fluorine intensity/carbon intensity ratio of the second region where the fluorine intensity/carbon intensity ratio is a ratio of the fluorine intensity to the carbon intensity (fluorine intensity/carbon intensity). 7. The gas diffusion electrode according to claim 1 , wherein the fluorine intensity/carbon intensity ratio of the third region is 1.0 to 1.3 times the fluorine intensity/carbon intensity ratio of the first region where the fluorine intensity/carbon intensity ratio is a ratio of the fluorine intensity to the carbon intensity (fluorine intensity/carbon intensity). 8. A fuel cell comprising the gas diffusion electrode according to claim 1 .
Assignees
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Classifications
in the form of layered or coated products · CPC title
- H01M8/0234Primary
Carbonaceous material · CPC title
Inert electrodes with catalytic activity, e.g. for fuel cells · CPC title
with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying · CPC title
Fuel cells with solid electrolytes · CPC title
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- What does patent US10950868B2 cover?
- 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 fluo…
- Who is the assignee on this patent?
- Toray Industries
- What technology area does this patent fall under?
- Primary CPC classification H01M8/0234. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 16 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).