公开(公告)号：US20240266554A1

公开(公告)日：2024-08-08

申请号：US18294266

申请日：2022-08-04

Applicant: UNIVERSITY OF YAMANASHI ,  Nikki-Universal Co., Ltd.

Inventor： Toshihiro MIYAO ,  Hanako NISHINO ,  Makoto UCHIDA ,  Akihiro IIYAMA ,  Naoto KOIZUMI ,  Kazuya SHIBANUMA ,  Naoki TONE

IPC: H01M4/92 ,  C01B32/05 ,  H01M4/86

CPC classification number: H01M4/926 ,  C01B32/05 ,  C01P2006/16 ,  C01P2006/40 ,  H01M2004/8689

Abstract: A supported metal catalyst, including: a support that is a collective body of conductive particles; and dispersed active metal particles supported on the conductive particles. The conductive particles include a plurality of pores; an average entrance pore diameter of the pores is 1 to 20 nm; a standard deviation of the average entrance pore diameter is equal to or less than 50% of the average entrance pore diameter; a number fraction of the active metal particles supported in a surface layer region of the conductive particles divided by a total number of the active metal particles is equal to or more than 50%; the surface layer region is a region on a surface of the conductive particles or a region in the pores within a depth of 15 nm from the surface; and an average interparticle distance of the active metal particles is 5 to 20 nm.

公开(公告)号：US20200164349A1

公开(公告)日：2020-05-28

申请号：US16632657

申请日：2018-07-18

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Katsuyoshi KAKINUMA ,  Makoto UCHIDA ,  Akihiro IIYAMA

IPC: B01J23/89 ,  B01J32/00 ,  B01J37/08 ,  B01J37/16 ,  H01M4/92

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.

公开(公告)号：US20190030514A1

公开(公告)日：2019-01-31

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

IPC: B01J23/42 ,  B01J32/00 ,  B01J37/08 ,  C09C1/48 ,  H01M4/96 ,  H01M8/10

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：US20170141407A1

公开(公告)日：2017-05-18

申请号：US15300075

申请日：2015-03-05

Applicant: Mitsui Mining & Smelting Co., Ltd. ,  University of Yamanashi

Inventor： Koji TANIGUCHI ,  Masahiro WATANABE ,  Makoto UCHIDA ,  Katsuyoshi KAKINUMA

IPC: H01M4/86 ,  H01M8/1004 ,  H01M4/92

CPC classification number: H01M4/8663 ,  H01M4/8605 ,  H01M4/9075 ,  H01M4/925 ,  H01M8/1004 ,  H01M2008/1095 ,  H01M2300/0082

Abstract: To provide 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%.

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.

公开(公告)号：US20180175397A1

公开(公告)日：2018-06-21

申请号：US15737091

申请日：2016-03-23

Applicant: PANASONIC CORPORATION ,  NATIONAL UNIVERSITY CORPORATION UNIVERSITY OF YAMANASHI

Inventor： Haruhiko SHINTANI ,  Katsuyoshi KAKINUMA ,  Makoto UCHIDA ,  Masahiro WATANABE

IPC: H01M4/92 ,  B01J23/42 ,  B01J23/648 ,  H01M8/0206 ,  H01M8/1004 ,  H01M8/1018 ,  H01M4/86

CPC classification number: H01M4/92 ,  B01J23/42 ,  B01J23/648 ,  H01M4/86 ,  H01M4/8657 ,  H01M4/8673 ,  H01M4/90 ,  H01M8/02 ,  H01M8/0206 ,  H01M8/10 ,  H01M8/1004 ,  H01M8/1018 ,  H01M2004/8684 ,  H01M2008/1095

Abstract: A cell includes: a membrane electrode assembly; and a pair of separators. The membrane electrode assembly includes a polymer electrolyte membrane, an anode catalyst layer on a first main surface of the polymer electrolyte membrane, and a cathode catalyst layer on a second main surface. The anode catalyst layer contains a first catalyst material having activity against a hydrogen oxidation reaction and a first electrically conductive material whose electrical resistance under a hydrogen atmosphere and under an oxygen atmosphere are different from each other. The cathode catalyst layer contains a second catalyst material having activity against an oxygen reduction reaction and a second electrically conductive material different from the first electrically conductive material. An electrical resistance of the cell when the anode catalyst layer is under oxygen atmosphere is more than twice the electrical resistance of the cell when the anode catalyst layer is under hydrogen atmosphere.

公开(公告)号：US20170250409A1

公开(公告)日：2017-08-31

申请号：US15444517

申请日：2017-02-28

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Katsuyoshi KAKINUMA ,  Makoto UCHIDA ,  Akihiro IIYAMA

IPC: H01M4/92 ,  C22C5/04

CPC classification number: H01M4/921 ,  C22C5/04 ,  H01M4/925 ,  H01M2008/1095 ,  H01M2250/20 ,  Y02T90/32

Abstract: To spread the use of catalysts for fuel cells, there is a demand to develop a catalyst that uses less Pt and has a high power generation efficiency. An electrode catalyst includes a support particle containing a metal oxide and a precious-metal alloy supported on the support particle. The support particle includes multiple branches, a hole between the branches, and a pore. The pore is surrounded by the branches and the hole. The precious-metal alloy includes a precious metal element and at least one or more transition elements.

公开(公告)号：US20250003089A1

公开(公告)日：2025-01-02

申请号：US18711328

申请日：2022-11-22

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Katsuyoshi KAKINUMA ,  Makoto UCHIDA ,  Akihiro IIYAMA

IPC: C25B11/037 ,  C25B1/04 ,  C25B9/19 ,  C25B9/40 ,  C25B11/054 ,  C25B11/067 ,  C25B11/081

Abstract: An electrode catalyst, including: a support powder; and active particles supported on the support powder. The support powder is an aggregate of support fine particles having a chained portion structured by a plurality of crystallites being fusion-bonded to form a chain; the support fine particles contain a metal oxide doped with a dopant element; the metal oxide contains tin as a main element; the active particles contain a platinum group oxide containing a platinum group element; and a loading ratio of the active particles is 25 mass % or higher.

公开(公告)号：US20240055616A1

公开(公告)日：2024-02-15

申请号：US18259304

申请日：2021-12-23

Applicant: UNIVERSITY OF YAMANASHI ,  NIHON KAGAKU SANGYO CO., LTD.

Inventor： Katsuyoshi KAKINUMA ,  Akihiro IIYAMA ,  Makoto UCHIDA ,  Sumitaka WATANABE ,  Isao AMEMIYA

IPC: H01M4/92 ,  H01M4/90

CPC classification number: H01M4/925 ,  H01M4/9075

Abstract: The present invention provides a supported metal catalyst that has an electric conductivity acceptable as a catalyst and can suppress the generation of hydrogen peroxide.
According to the present invention, provided is a supported metal catalyst, comprising: 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 a metal oxide; the metal oxide contains cerium; and an electric conductivity of the supported metal catalyst is 10−4 S/cm or higher.

公开(公告)号：US20230006219A1

公开(公告)日：2023-01-05

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

IPC: H01M4/92 ,  C25B11/067

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.