The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2025
Filed:
Jun. 24, 2022
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Shinichiro Imura, Hyogo Ken, JP;
Takeshi Minamiura, Osaka Fu, JP;
Kenichi Ezaki, Osaka Fu, JP;
Tsutomu Kawashima, Nara Ken, JP;
Miyuki Yoshimoto, Osaka Fu, JP;
Abstract
A membrane electrode assembly for a fuel cell includes 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 Raof the first main surface and an arithmetic mean roughness Raof the second main surface satisfies the relation, Ra>Ra