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公开(公告)号:US20190341639A1
公开(公告)日:2019-11-07
申请号:US16515973
申请日:2019-07-18
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Makoto UCHIDA , Katsuyoshi Kakinuma
IPC: H01M8/1004 , C23C16/02 , H01M4/88 , H01M4/92
Abstract: A method for forming an electrode catalyst layer by putting catalyst ink within an insulative container having a conductive nozzle in communication with the interior of the container and applying an electrospray voltage to the nozzle to cause electrospray of the catalyst ink through the tip end of the nozzle and thereby to form an electrode catalyst layer, the method includes preparing catalyst ink containing a mixture of at least electrode catalyst, polymer electrolyte binder and volatile organic compound and/or water, putting the catalyst ink within the container with a space remaining inside thereof and air-tightly sealing the container, and electrospraying with the space inside of the air-tightly sealed container being conditioned to have a negative pressure of a level at which the catalyst ink cannot drip off from the nozzle.
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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:US11108070B2
公开(公告)日:2021-08-31
申请号:US16515973
申请日:2019-07-18
Applicant: UNIVERSITY OF YAMANASHI
Inventor: Makoto Uchida , Katsuyoshi Kakinuma
IPC: H01M8/1004 , C23C16/02 , H01M4/88 , H01M4/92
Abstract: A method for forming an electrode catalyst layer by putting catalyst ink within an insulative container having a conductive nozzle in communication with the interior of the container and applying an electrospray voltage to the nozzle to cause electrospray of the catalyst ink through the tip end of the nozzle and thereby to form an electrode catalyst layer, the method includes preparing catalyst ink containing a mixture of at least electrode catalyst, polymer electrolyte binder and volatile organic compound and/or water, putting the catalyst ink within the container with a space remaining inside thereof and air-tightly sealing the container, and electrospraying with the space inside of the air-tightly sealed container being conditioned to have a negative pressure of a level at which the catalyst ink cannot drip off from the nozzle.
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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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5.
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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7.
公开(公告)号:US11332623B2
公开(公告)日:2022-05-17
申请号:US15779674
申请日:2016-11-28
Applicant: University of Yamanashi , Denka Company Limited
Inventor: Makoto Uchida , Katsuyoshi Kakinuma , Daiki Ikeda , Yusaku Harada , Takeshi Miyakawa
Abstract: An electrode catalyst support, capable of improving the power of a fuel cell, and an electrode catalyst and a solid polymer fuel cell using the same.
Provided is carbon black wherein pores which are at most 6 nm in pore diameter have a cumulative pore volume of less than 0.25 cm3/g, a specific surface area by BET is 500 to 900 m2/g, and a volatile matter content is 1.0 to 10.0%. Also provided are an electrode catalyst for a fuel cell comprising a support which includes this carbon black, and a solid polymer fuel cell having the electrode catalyst.-
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:US11594737B2
公开(公告)日:2023-02-28
申请号:US16434031
申请日:2019-06-06
Inventor: Koji Taniguchi , Masahiro Watanabe , Makoto Uchida , Katsuyoshi Kakinuma
IPC: H01M8/10 , H01M4/86 , H01M8/1004 , H01M4/90 , H01M4/92
Abstract: A membrane-electrode assembly including a catalyst layer that includes a catalyst-supporting carrier in which a catalyst is supported on a carrier made of an inorganic oxide, and a highly hydrophobic substance having a higher degree of hydrophobicity than the inorganic oxide, the catalyst layer being formed on at least one surface of a polymer electrolyte membrane. It is preferable that, in the membrane-electrode assembly, the degree of hydrophobicity of the highly hydrophobic substance is from 0.5 vol % to 45 vol % at 25° C., the degree of hydrophobicity being defined as a concentration of methanol (vol %) when a light transmittance of a dispersion obtained by dispersing the highly hydrophobic substance in a mixed solution of water and methanol reaches 80%.
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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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