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:
Jan. 31, 2006
Filed:
Mar. 05, 2002
Eiichi Yasumoto, Kyoto, JP;
Akihiko Yoshida, Hirakata, JP;
Makoto Uchida, Hirakata, JP;
Junji Morita, Moriguchi, JP;
Yasushi Sugawara, Higashiosaka, JP;
Hisaaki Gyoten, Shijonawate, JP;
Masao Yamamoto, Kishiwada, JP;
Osamu Sakai, Neyagawa, JP;
Junji Niikura, Hirakata, JP;
Eiichi Yasumoto, Kyoto, JP;
Akihiko Yoshida, Hirakata, JP;
Makoto Uchida, Hirakata, JP;
Junji Morita, Moriguchi, JP;
Yasushi Sugawara, Higashiosaka, JP;
Hisaaki Gyoten, Shijonawate, JP;
Masao Yamamoto, Kishiwada, JP;
Osamu Sakai, Neyagawa, JP;
Junji Niikura, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
It has been difficult to keep the voltage of a polymer electrolyte fuel cell stable for a long period of time because uniform water content control over the plane of the membrane-electrode assembly is impossible. A gas diffusion electrode is produced by forming a conductive polymer layer composed of conductive particles and a polymer material on a porous material composed of carbon fiber, and forming a catalyst layer composed of platinum-carried carbon particles on the plane of the conductive polymer layer. The conductive polymer layer is composed of conductive particles different in particle size, and the content of the conductive particles having the smaller particle size is decreased from one end towards the other end of the gas diffusion electrode.