公开(公告)号：US20240282994A1

公开(公告)日：2024-08-22

申请号：US18638661

申请日：2024-04-17

Applicant: TOPPAN HOLDINGS INC.

Inventor： Hiroyuki MORIOKA ,  Madoka Ozawa

IPC: H01M8/1004 ,  H01M4/86 ,  H01M4/88 ,  H01M8/10

CPC classification number: H01M8/1004 ,  H01M4/8673 ,  H01M4/8807 ,  H01M2008/1095

Abstract: A membrane electrode assembly includes: a polymer electrolyte membrane; a pair of electrode catalyst layers disposed with the polymer electrolyte membrane therebetween while being in contact with a surface of the polymer electrolyte membrane; and a gas diffusion layer laminated on each of the pair of electrode catalyst layers. The gas diffusion layer includes a microporous layer in contact with the electrode catalyst layer and a diffusion substrate layer made of a fiber substrate. An average fiber diameter of a fiber material contained in the diffusion substrate layer is 10 times or more and 150 times of less of an average fiber diameter of the fibrous substance contained in the electrode catalyst layer.