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公开(公告)号:US11990627B2
公开(公告)日:2024-05-21
申请号:US17967180
申请日:2022-10-17
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama
IPC: H01M4/92 , H01M8/1004
CPC classification number: H01M4/925 , H01M8/1004
Abstract: The carrier metal catalyst achieves suppression of internal resistance of a fuel cell. A carrier metal catalyst includes: a carrier powder; and metal fine particles supported on the carrier powder; wherein: the carrier powder is an aggregates of carrier fine particles; the carrier fine particles includes a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the carrier fine particles include titanium oxide; the carrier fine particles are doped with an element having a valence different from a valence of titanium; the titanium oxide of the carrier powder has an anatase phase/rutile phase ratio of 0.2 or lower; the metal fine particles have a mean particle size of 3 to 10 nm; the metal fine particles include platinum; and a cell resistance measured under standard conditions of a fuel cell prepared using the carrier metal catalyst is 0.090 Ωcm·2 or lower.
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公开(公告)号:US12244022B2
公开(公告)日:2025-03-04
申请号:US17782964
申请日:2020-12-10
Applicant: UNIVERSITY OF YAMANASHI , NIHON KAGAKU SANGYO CO., LTD.
Inventor: Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama , Isao Amemiya , Chisato Arata , Sumitaka Watanabe
Abstract: A support and metal catalyst with improved electric conductivity is provided. A support and metal catalyst, including: a support powder; and metal fine particles supported on the support powder; wherein: the support powder is an aggregate of support fine particles; the support fine particles have a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the support fine particles are structured with metal oxide; and the metal oxide is doped with a dopant element, and an atomic ratio of titanium with respect to total of titanium and tin is 0.30 to 0.80, is provided.
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公开(公告)号:US20210339224A1
公开(公告)日:2021-11-04
申请号:US17286785
申请日:2019-10-16
Applicant: Nihon Kagaku Sangyo Co., Ltd. , University of Yamanashi
Inventor: Chisato Arata , Hajime Kashima , Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama
Abstract: A support powder can improve cell performance under high humidity environment. A support and metal catalyst, including: a support powder; and metal fine particles supported on the support powder; wherein: the support powder is an aggregate of support fine particles; the support fine particles are fine particles of oxide compound and has a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the crystallites have a size of 10 to 30 nm; the support powder has a void; the void includes a secondary pore having a pore diameter of more than 25 nm and 80 nm or less determined by BJH method; and a volume of the secondary pore per unit volume of the support fine particles structuring the support powder is 0.313 cm3/cm3 or more, is provided.
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公开(公告)号:US10333152B2
公开(公告)日:2019-06-25
申请号:US15234688
申请日:2016-08-11
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Makoto Uchida , Katsuyoshi Kakinuma , Masahiro Watanabe , Akihiro Iiyama
IPC: H01M8/04 , H01M4/92 , H01M8/04223 , H01M8/04225
Abstract: A fuel cell system and a method of operating the same is provided that is capable of reducing degradation of a cathode catalyst of a fuel cell. A fuel cell system is provided that includes a fuel cell having a catalyst used for an anode, wherein a carrier of the catalyst is composed of a material with a property where electric resistance in an oxygen containing atmosphere is greater than electric resistance in a hydrogen atmosphere; and a control device configured to control the fuel cell, when supply of fuel gas is stopped during stoppage of operation of the fuel cell, to consume all or part of the fuel gas in a fuel gas chamber, followed by introducing oxygen containing gas into the fuel gas chamber.
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公开(公告)号:US11752490B2
公开(公告)日:2023-09-12
申请号:US17286785
申请日:2019-10-16
Applicant: Nihon Kagaku Sangyo Co., Ltd. , University of Yamanashi
Inventor: Chisato Arata , Hajime Kashima , Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama
CPC classification number: B01J21/063 , B01J23/14 , B01J35/006 , B01J35/1014 , B01J35/1038 , B01J35/1061 , B01J35/1066 , B01J37/08 , H01M4/9075
Abstract: A support powder can improve cell performance under high humidity environment. A support and metal catalyst, including: a support powder; and metal fine particles supported on the support powder; wherein: the support powder is an aggregate of support fine particles; the support fine particles are fine particles of oxide compound and has a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the crystallites have a size of 10 to 30 nm; the support powder has a void; the void includes a secondary pore having a pore diameter of more than 25 nm and 80 nm or less determined by BJH method; and a volume of the secondary pore per unit volume of the support fine particles structuring the support powder is 0.313 cm3/cm3 or more, is provided.
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公开(公告)号:US11563219B2
公开(公告)日:2023-01-24
申请号:US16632657
申请日:2018-07-18
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama
Abstract: A carrier powder is thermodynamically stable and conductivity can be easily provided thereto. A carrier powder includes an aggregate of carrier fine particles; wherein: the carrier fine particles include a chained portion structured by fusion bonding a plurality of crystallites into a chain; the carrier fine particles contain titanium oxide; and a ratio of anatase phase/rutile phase of the titanium oxide of the carrier powder is 0.2 or lower.
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公开(公告)号:US11502309B2
公开(公告)日:2022-11-15
申请号:US16774242
申请日:2020-01-28
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Katsuyoshi Kakinuma , Makoto Uchida , Akihiro Iiyama
IPC: H01M4/92 , H01M8/1004
Abstract: The carrier metal catalyst achieves suppression of internal resistance of a fuel cell. A carrier metal catalyst includes: a carrier powder; and metal fine particles supported on the carrier powder; wherein: the carrier powder is an aggregates of carrier fine particles; the carrier fine particles includes a chained portion structured by a plurality of crystallites being fusion bonded to form a chain; the carrier fine particles include titanium oxide; the carrier fine particles are doped with an element having a valence different from a valence of titanium; the titanium oxide of the carrier powder has an anatase phase/rutile phase ratio of 0.2 or lower; the metal fine particles have a mean particle size of 3 to 10 nm; the metal fine particles include platinum; and a cell resistance measured under standard conditions of a fuel cell prepared using the carrier metal catalyst is 0.090 Ω·cm2 or lower.
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