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:
May. 05, 2020
Filed:
Jan. 04, 2018
Ngk Insulators, Ltd., Nagoya-shi, Aichi, JP;
Shinji Fujisaki, Kuwana, JP;
Yoshihiko Yamamura, Nagoya, JP;
Takashi Ryu, Nagoya, JP;
Makoto Ohmori, Nagoya, JP;
NGK INSULATORS, LTD., Nagoya-shi, Aichi, JP;
Abstract
A fuel cell cathode contains a perovskite oxide as a main component. The perovskite oxide is expressed by the general formula ABOand including La and Sr at the A site. A solid electrolyte layer is disposed between an anode and the cathode. The cathode has a surface on an opposite side to the solid electrolyte layer. A first ratio of a Sr concentration relative to an La concentration is less than or equal to 4 times a second ratio of the Sr concentration relative to the La concentration. The first ratio is detected by the use of X-ray photoelectron spectroscopy on the surface of the cathode. The second ratio of a Sr concentration relative to a La concentration is detected by the use of X-ray photoelectron spectroscopy on an exposed surface exposed by surface processing of the surface and positioned within 5 nm of the surface in relation to a direction of thickness.