公开(公告)号：US20200147590A1

公开(公告)日：2020-05-14

申请号：US16473422

申请日：2017-12-27

Applicant: SHOWA DENKO K.K.

Inventor： Takuya IMAI ,  Kazuo FURUYA ,  Kunchan LEE ,  Suguru SAKAGUCHI ,  Yoshishige OKUNO

IPC: B01J23/75 ,  H01M4/90 ,  H01M8/10

Abstract: An oxygen reduction catalyst containing as constituent elements cobalt, sulfur, and a transition metal element M being at least one element selected from chromium and molybdenum, the oxygen reduction catalyst being ascertained to have a crystal structure of a cobalt disulfide cubic crystal in powder X-ray diffraction measurement, and having a molar ratio of the transition metal element M to cobalt (M/cobalt) of 5/95 to 15/85. Also disclosed is an electrode having a catalyst layer containing the oxygen reduction catalyst, a membrane electrode assembly including a polymer electrolyte membrane wherein the electrode serves as a cathode and/or an anode, and a fuel cell including the membrane electrode assembly.

公开(公告)号：US20200028182A1

公开(公告)日：2020-01-23

申请号：US16495635

申请日：2018-03-22

Applicant: SHOWA DENKO K.K.

Inventor： Takuya IMAI ,  Kazuo FURUYA ,  Kunchan LEE

IPC: H01M4/90 ,  H01M8/1004

Abstract: Provided are an oxygen reduction catalyst having a high electrode potential under a fuel cell operating environment, an electrode containing the oxygen reduction catalyst, a membrane electrode assembly in which a cathode is the electrode, and a fuel cell including the membrane electrode assembly. The oxygen reduction catalyst used here contains cobalt, sulfur, and oxygen as elements, has a CoS hexagonal structure in powder X-ray diffractometry, and having an S—Co/S—O peak area ratio of 2.1 to 8.9 in an S2p spectrum in X-ray photoelectron spectroscopic analysis.

公开(公告)号：US20200020966A1

公开(公告)日：2020-01-16

申请号：US16495637

申请日：2018-03-22

Applicant: SHOWA DENKO K.K.

Inventor： Takuya IMAI ,  Kazuo FURUYA ,  Kunchan LEE

IPC: H01M8/1004 ,  H01M4/92 ,  B01J27/043

Abstract: Provided are an oxygen reduction catalyst having a high electrode potential under a fuel cell operating environment, an electrode containing the oxygen reduction catalyst, a membrane electrode assembly in which a cathode is the electrode, and a fuel cell including the membrane electrode assembly. The oxygen reduction catalyst used here contains cobalt, sulfur, and oxygen as elements, has a CoS2 cubic structure in powder X-ray diffractometry, and having an S—Co/S—O peak area ratio of 6 to 15 in an S2p spectrum in X-ray photoelectron spectroscopic analysis.