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：US20240043283A1

公开(公告)日：2024-02-08

申请号：US18265372

申请日：2021-12-15

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

Inventor： Chisato ARATA ,  Sumitaka WATANABE ,  Katsuyoshi KAKINUMA

IPC: C01G35/00 ,  H01M4/90

CPC classification number: C01G35/006 ,  C01G35/00 ,  H01M4/9075 ,  C01P2004/50 ,  C01P2002/54 ,  C01P2002/20 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64

Abstract: A bead string of tin oxide crystallite or a bead string of complex oxide crystallite of tin oxide and titanium oxide contains tantalum and has specific hue as well as a crystallite size on the order of nanometer, and exhibits excellent conductivity and improves the catalytic activity. A bead string includes a tin oxide crystal particle aggregate or a crystal particle aggregate of a complex oxide of tin oxide and titanium oxide, in which the crystal particle aggregate contains at least one particle having a crystallite size of 5 to 50 nm, and when the crystal particle aggregate is pressed under a pressure of 0.1 MPa to have a thickness of 1 cm, in the color of the resultant particle aggregate represented by Lab color space, a lightness L* value is 80 or less, a chromaticity a* value is −4 or less, and a chromaticity b* is −3 or less.

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.

公开(公告)号：US20200243872A1

公开(公告)日：2020-07-30

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.

公开(公告)号：US20170047600A1

公开(公告)日：2017-02-16

申请号：US15234688

申请日：2016-08-11

Applicant: UNIVERSITY OF YAMANASHI

Inventor： Makoto UCHIDA ,  Katsuyoshi KAKINUMA ,  Masahiro WATANABE ,  Akihiro IIYAMA

IPC: H01M8/04082 ,  H01M8/04746

CPC classification number: H01M4/925 ,  H01M8/04225 ,  H01M8/04238

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.

Abstract translation: 提供了能够降低燃料电池的阴极催化剂的劣化的燃料电池系统及其操作方法。 提供了一种燃料电池系统，其包括具有用于阳极的催化剂的燃料电池，其中，所述催化剂的载体由具有在含氧气氛中的电阻大于氢气氛中的电阻的性质的材料构成 ; 以及控制装置，被配置为当在燃料电池的停止操作期间停止供应燃料气体时，控制燃料电池，以消耗燃料气体室中的全部或部分燃料气体，随后将含氧气体引入到燃料电池 燃气舱。