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：US20230299307A1

公开(公告)日：2023-09-21

申请号：US18007844

申请日：2021-06-07

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Katsuyoshi KAKINUMA

IPC: H01M4/90 ,  H01M4/86 ,  C25B11/031 ,  C25B11/091

CPC classification number: H01M4/9041 ,  H01M4/8657 ,  C25B11/031 ,  C25B11/091 ,  H01M4/8605 ,  H01M4/9075 ,  C25B1/04

Abstract: An electrode catalyst including a void-containing body having a void, the void-containing body includes a core part and a skin layer covering the core part, the core part is structured with metal, and the skin layer is structured with an oxide containing Ni.

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：US20230321633A1

公开(公告)日：2023-10-12

申请号：US18042531

申请日：2021-08-20

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Katsuyoshi KAKINUMA ,  Makoto UCHIDA ,  Akihiro IIYAMA

IPC: B01J23/14 ,  B01J35/10 ,  B01J35/00 ,  B01J23/42 ,  B01J35/02

CPC classification number: B01J23/14 ,  B01J35/1014 ,  B01J35/0013 ,  B01J23/42 ,  B01J35/026 ,  B01J35/0033

Abstract: A supported metal catalyst in which an electric conductivity is enhanced. The supported metal catalyst includes a support powder; and metal fine particles supported by the support powder. The support powder is an aggregate of support fine particles; the support fine particles are provided with 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; and the supported amount of metal fine particles per unit area of the surface area of the support powder calculated based on sphere approximation is 3.4 to 13.7 (mg/m2).

公开(公告)号：US20230049745A1

公开(公告)日：2023-02-16

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

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.

公开(公告)号：US20190288297A1

公开(公告)日：2019-09-19

申请号：US16434031

申请日：2019-06-06

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

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

IPC: H01M4/86 ,  H01M4/92 ,  H01M8/1004 ,  H01M4/90

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%.

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.