US 12,176,547 B2
Catalyst layer for polymer electrolyte fuel cells, membrane-electrode assembly, and polymer electrolyte fuel cell
Hiroaki Koyama, Tokyo (JP); and Madoka Ozawa, Tokyo (JP)
Assigned to TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed by TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed on Sep. 17, 2021, as Appl. No. 17/478,485.
Application 17/478,485 is a continuation of application No. PCT/JP2020/012754, filed on Mar. 23, 2020.
Claims priority of application No. 2019-055655 (JP), filed on Mar. 22, 2019.
Prior Publication US 2022/0006099 A1, Jan. 6, 2022
Int. Cl. H01M 4/86 (2006.01); H01M 4/90 (2006.01); H01M 8/1004 (2016.01); H01M 8/1018 (2016.01)
CPC H01M 4/8657 (2013.01) [H01M 4/9083 (2013.01); H01M 8/1004 (2013.01); H01M 8/1018 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A catalyst layer for polymer electrolyte fuel cells, comprising:
a catalyst, carbon particles, a fluorine polymer electrolyte, and a fibrous material, the carbon particles carrying the catalyst, wherein:
the fibrous material has a fiber length of 0.1 μm or more and 200 μm or less and an average fiber diameter of 0.5 nm or more and 500 nm or less;
the catalyst layer for polymer electrolyte fuel cells includes voids; and
a percentage of frequencies of the voids having a cross-sectional area of 10,000 nm2 or more is 13% or more and 20% or less among the voids observed in a thickness-direction cross section of the catalyst layer perpendicular to a surface thereof.