Gas diffusion electrode base, laminate and fuel cell

Patent metadata

Field	Value
Publication number	US-10804542-B2
Application number	US-201716078330-A
Country	US
Kind code	B2
Filing date	Mar 27, 2017
Priority date	Mar 29, 2016
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

A gas diffusion electrode substrate has an electrically conductive porous substrate and a microporous layer-1 on one side of the electrically conductive porous substrate. The microporous layer-1 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-1 as 100% and a width of 10 μm to 200 μm. 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.

First claim

The invention claimed is:

1. A gas diffusion electrode substrate comprising:
an electrically conductive porous substrate and
a microporous layer- 1 on one side of said electrically conductive porous substrate;
wherein said microporous layer- 1 comprises a dense portion A and a dense portion B;
wherein said dense portion A is a region including a fluorine resin and a carbonaceous powder having a primary particle size of 20 nm to 39 nm;
wherein said dense portion A has a thickness of 30% to 100% with respect to the thickness of said microporous layer- 1 as 100% and a width of 10 μm to 200 μm; and
wherein said dense portion B is a region including a fluorine resin and a carbonaceous powder having a primary particle size of 40 nm to 70 nm.

2. The gas diffusion electrode substrate according to claim 1 , wherein a difference (T(0.15)−T(3.00)) between the thickness of said gas diffusion electrode substrate under a pressure of 0.15 MPa T(0.15) and the thickness of said gas diffusion electrode substrate under a pressure of 3.00 MPa T(3.00) is 30 μm to 60 μm.

3. The gas diffusion electrode substrate according to claim 1 , wherein the pore size peak of said dense portion B is larger than the pore size peak of said dense portion A.

4. The gas diffusion electrode substrate according to claim 1 , wherein the pore size peak of said dense portion A is 0.05 μm to 0.20 μm.

5. The gas diffusion electrode substrate according to claim 1 , wherein the pore size peak of said dense portion B is 0.21 μm to 0.60 μm.

6. The gas diffusion electrode substrate according to claim 1 , further comprising, on said microporous layer- 1 , a microporous layer- 2 which contains a fluorine resin and a carbonaceous powder having a primary particle size of 20 nm to 39 nm, and which has a thickness of 10 μm or less.

7. The gas diffusion electrode substrate according to claim 6 , wherein the pore size peak of said dense portion B is larger than the pore size peak of said microporous layer- 2 .

8. The gas diffusion electrode substrate according to claim 6 , wherein the pore size peak of said microporous layer- 2 is 0.05 μm to 0.20 μm.

9. The gas diffusion electrode substrate according to claim 1 , wherein said carbonaceous powder is carbon black.

10. The gas diffusion electrode substrate according to claim 1 , wherein a water contact angle to the microporous layer side of said gas diffusion electrode substrate is 130 degrees or more.

11. The gas diffusion electrode substrate according to claim 1 , wherein the number of fluffy points on the microporous layer side of said gas diffusion electrode substrate is 0.5 points/cm 2 or less.

12. The gas diffusion electrode substrate according to claim 1 , wherein the number of fluffy points on said electrically conductive porous substrate is 1.0 points/cm 2 or less.

13. A laminate comprising a catalyst layer on the microporous layer side of said gas diffusion electrode substrate according to claim 1 .

14. A fuel cell comprising said gas diffusion electrode substrate according to claim 1 .

Assignees

• Toray Industries

Inventors

• Utsunomiya Masamichi
• Tanimura Yasuaki
• Kamae Toshiya
• Urai Junichi

Classifications

• B32B2457/18

  Fuel cells · CPC title

• B32B2307/302

  Conductive · CPC title

• B32B2307/202

  Conductive · CPC title

• B32B2266/045

  Metal · CPC title

• B32B2255/28

  Multiple coating on one surface · CPC title