US 12,272,849 B2
Membrane electrode assembly for fuel cell, and fuel cell
Shinichiro Imura, Hyogo Ken (JP); Takeshi Minamiura, Osaka Fu (JP); Kenichi Ezaki, Osaka Fu (JP); Tsutomu Kawashima, Nara Ken (JP); and Miyuki Yoshimoto, Osaka Fu (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jun. 24, 2022, as Appl. No. 17/849,346.
Application 17/849,346 is a continuation of application No. PCT/JP2020/045712, filed on Dec. 8, 2020.
Claims priority of application No. 2019-236908 (JP), filed on Dec. 26, 2019.
Prior Publication US 2022/0359899 A1, Nov. 10, 2022
Int. Cl. H01M 8/1004 (2016.01); H01M 4/88 (2006.01); H01M 4/96 (2006.01)
CPC H01M 8/1004 (2013.01) [H01M 4/8807 (2013.01); H01M 4/96 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A membrane electrode assembly for a fuel cell comprising:
a catalyst layer having a first main surface and a second main surface,
a gas diffusion layer disposed on a side of the first main surface, and
an electrolyte membrane disposed on a side of the second main surface, wherein
the gas diffusion layer includes a conductive material and a polymer resin,
the conductive material comprises a fibrous carbon material,
an average fiber diameter D of the fibrous carbon material is equal to or less than 25% of a thickness T of the catalyst layer, and
in a cross section in a thickness direction of the catalyst layer, an arithmetic mean roughness Ra1 of the first main surface and an arithmetic mean roughness Ra2 of the second main surface satisfies the relation, Ra1>Ra2.