Patents by Inventor Takeshi Kaieda

Takeshi Kaieda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11239473
    Abstract: The present invention relates to a catalyst for solid polymer fuel cells in which catalyst particles including platinum or platinum alloy are supported on a carbon powder carrier. The catalyst of the present invention is a catalyst for solid polymer fuel cells in which the bond energy (Ec) at a gravity center position is 2.90 eV or more and 3.85 eV or less as calculated from a spectrum area of a Pt5d orbit-derived spectrum which is obtained by measuring a valence band spectrum in a range of 0 eV or more and 20 eV or less in the result of subjecting the catalyst particles to X-ray photoelectron spectroscopic analysis.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: February 1, 2022
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Takeshi Kaieda, Koichi Matsutani
  • Patent number: 11145874
    Abstract: The present invention relates to a catalyst for solid polymer fuel cells in which catalyst particles including platinum and a transition metal M are supported on a carbon powder carrier. The catalyst of the present invention is a catalyst for solid polymer fuel cells in which a molar ratio (Pt/M) of platinum to the transition metal M that form catalyst particles is 2.5 or more, and a ratio (SCOMSA/SBET) of a platinum specific surface area (SCOMSA) measured by a CO adsorption method to a catalyst specific surface area (SBET) measured by a BET method is 0.26 or more and 0.32 or less. The catalyst can be produced by preparing an alloy catalyst, then washing the alloy catalyst with a platinum compound solution, and additionally supplying platinum to the surfaces of catalyst particles.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: October 12, 2021
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Koichi Matsutani, Wataru Hashimoto, Takeshi Kaieda
  • Patent number: 10998556
    Abstract: The present invention relates to a catalyst for a solid polymer fuel cell, including platinum, cobalt, and zirconium supported as a catalytic metal on a carbon powder carrier, in which the supporting ratio of platinum, cobalt, and zirconium on the carbon powder carrier is Pt:Co:Zr=3:0.5 to 1.5:0.1 to 3.0 by molar ratio. In the present invention, it is preferable that the peak position of Pt3Co seen in the X-ray diffraction pattern of catalyst particles is 2?=41.10° or more and 42.00° or less, and moderate alloying has occurred in the catalytic metal.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: May 4, 2021
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Wataru Hashimoto, Tatsunori Namai, Minoru Ishida, Hitoshi Nakajima, Kazuki Okaya, Takeshi Kaieda, Koichi Matsutani
  • Publication number: 20210126264
    Abstract: The present invention relates to a catalyst for solid polymer fuel cells in which catalyst particles including platinum and a transition metal M are supported on a carbon powder carrier. The catalyst of the present invention is a catalyst for solid polymer fuel cells in which a molar ratio (Pt/M) of platinum to the transition metal M that form catalyst particles is 2.5 or more, and a ratio (SCOMSA/SBET) of a platinum specific surface area (SCOMSA) measured by a CO adsorption method to a catalyst specific surface area (SBET) measured by a BET method is 0.26 or more and 0.32 or less. The catalyst can be produced by preparing an alloy catalyst, then washing the alloy catalyst with a platinum compound solution, and additionally supplying platinum to the surfaces of catalyst particles.
    Type: Application
    Filed: April 16, 2018
    Publication date: April 29, 2021
    Applicant: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Koichi MATSUTANI, Wataru HASHIMOTO, Takeshi KAIEDA
  • Publication number: 20200122123
    Abstract: Provided is a catalyst having a core-shell structure (which employs a core comprised of a highly electrochemically stable, relatively inexpensive material and thereby reduces the amount of platinum used, while providing a better cost/performance ratio in catalytic activity as compared to when platinum particles are used as a catalyst) for use in an oxygen reduction reaction (cathode reaction in a fuel cell), and to provide an oxygen reduction method using the catalyst. Provided is a core-shell catalyst for use for an oxygen reduction reaction, including: a core that is comprised of silver; and a shell layer that comprised of platinum, the shell layer being comprised of platinum atoms constituting a (111) plane of or a (001) plane of a face centered cubic lattice, in the shell layer, a nearest neighbor platinum-platinum interatomic distance falling within the range of from 2.81 {acute over (?)} to 2.95 {acute over (?)}.
    Type: Application
    Filed: August 29, 2017
    Publication date: April 23, 2020
    Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Wilson Agerico tan DIÑO, Bhume CHANTARAMOLEE, Ryo KISHIDA, Paulus Himawan LIM, Hiroshi NAKANISHI
  • Publication number: 20200052309
    Abstract: The present invention relates to a catalyst for solid polymer fuel cells in which catalyst particles including platinum or platinum alloy are supported on a carbon powder carrier. The catalyst of the present invention is a catalyst for solid polymer fuel cells in which the bond energy (Ec) at a gravity center position is 2.90 eV or more and 3.85 eV or less as calculated from a spectrum area of a Pt5d orbit-derived spectrum which is obtained by measuring a valence band spectrum in a range of 0 eV or more and 20 eV or less in the result of subjecting the catalyst particles to X-ray photoelectron spectroscopic analysis.
    Type: Application
    Filed: April 16, 2018
    Publication date: February 13, 2020
    Applicant: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Takeshi KAIEDA, Koichi MATSUTANI
  • Patent number: 10497942
    Abstract: A method for forming catalyst particles, each of which has a core/shell structure, by a Cu-UPD method. Namely, a method of manufacturing a catalyst wherein catalyst particles, each of which has a core/shell structure composed of a shell layer that is formed of platinum and a core particle that is covered with the shell layer and is formed of a metal other than platinum, are supported on a carrier. This method is characterized by comprising: an electrolysis step wherein the carrier supporting the core particles is electrolyzed in an electrolytic solution containing copper ions, so that copper is precipitated on the surfaces of the core particles; and a substitution reaction step wherein a platinum compound solution is brought into contact with the core particles, on which copper has been precipitated, so that the copper on the surface of each core particle is substituted by platinum, thereby forming a shell layer that is formed of platinum.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: December 3, 2019
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Koichi Matsutani, Takeshi Kaieda, Tomohiro Akiyama
  • Publication number: 20190296363
    Abstract: Provided are (i) a catalyst that has a core-shell structure and is highly active in an oxygen reduction reaction, which is a cathode reaction of a fuel cell, and (ii) a reaction acceleration method in which the catalyst is used. A core-shell catalyst for accelerating an oxygen reduction reaction, contains: silver or palladium as a core material; and platinum as a shell material, the core-shell catalyst having, on a surface thereof, a (110) surface of a face centered cubic lattice.
    Type: Application
    Filed: June 14, 2019
    Publication date: September 26, 2019
    Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Hideaki KASAI, Hiroshi NAKANISHI, Koji SHIMIZU
  • Publication number: 20190221858
    Abstract: The present invention relates to a catalyst for a solid polymer fuel cell, including platinum, cobalt, and zirconium supported as a catalytic metal on a carbon powder carrier, in which the supporting ratio of platinum, cobalt, and zirconium on the carbon powder carrier is Pt:Co:Zr=3:0.5 to 1.5:0.1 to 3.0 by molar ratio. In the present invention, it is preferable that the peak position of Pt3Co seen in the X-ray diffraction pattern of catalyst particles is 2?=41.10° or more and 42.00° or less, and moderate alloying has occurred in the catalytic metal.
    Type: Application
    Filed: September 7, 2017
    Publication date: July 18, 2019
    Inventors: Wataru HASHIMOTO, Tatsunori NAMAI, Minoru ISHIDA, Hitoshi NAKAJIMA, Kazuki OKAYA, Takeshi KAIEDA, Koichi MATSUTANI
  • Publication number: 20180138518
    Abstract: Provided are (i) a catalyst that has a core-shell structure and is highly active in an oxygen reduction reaction, which is a cathode reaction of a fuel cell, and (ii) a reaction acceleration method in which the catalyst is used. A core-shell catalyst for accelerating an oxygen reduction reaction, contains: silver or palladium as a core material; and platinum as a shell material, the core-shell catalyst having, on a surface thereof, a (110) surface of a face centered cubic lattice.
    Type: Application
    Filed: June 17, 2016
    Publication date: May 17, 2018
    Applicants: TANAKA KIKINZOKU KOGYO K.K., OSAKA UNIVERSITY
    Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Hideaki KASAI, Hiroshi NAKANISHI, Koji SHIMIZU
  • Publication number: 20180034062
    Abstract: A method for forming catalyst particles, each of which has a core/shell structure, by a Cu-UPD method. Namely, a method of manufacturing a catalyst wherein catalyst particles, each of which has a core/shell structure composed of a shell layer that is formed of platinum and a core particle that is covered with the shell layer and is formed of a metal other than platinum, are supported on a carrier. This method is characterized by comprising: an electrolysis step wherein the carrier supporting the core particles is electrolyzed in an electrolytic solution containing copper ions, so that copper is precipitated on the surfaces of the core particles; and a substitution reaction step wherein a platinum compound solution is brought into contact with the core particles, on which copper has been precipitated, so that the copper on the surface of each core particle is substituted by platinum, thereby forming a shell layer that is formed of platinum.
    Type: Application
    Filed: March 2, 2016
    Publication date: February 1, 2018
    Applicant: Tanaka Kikinzoku Kogyo K.K.
    Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Tomohiro AKIYAMA
  • Patent number: 9368805
    Abstract: The present invention provides a catalyst for a polymer electrolyte fuel cell including catalyst particles made of platinum supported on a carbon powder carrier, wherein the carbon powder carrier includes 0.7 to 3.0 mmol/g (based on the weight of the carrier) of a hydrophilic group bonded thereto; and the platinum particles have an average particle size of 3.5 to 8.0 nm and the platinum specific surface area based on CO adsorption (COMSA) of 40 to 100 m2/g. The catalyst for a polymer electrolyte fuel cell according to the present invention is a catalyst excellent in initial activity and satisfactory in durability.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: June 14, 2016
    Assignee: TANAKA KIKINZOKU KOGYO K.K
    Inventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima
  • Publication number: 20130244137
    Abstract: The present invention provides a catalyst for a polymer electrolyte fuel cell including catalyst particles made of platinum supported on a carbon powder carrier, wherein the carbon powder carrier includes 0.7 to 3.0 mmol/g (based on the weight of the carrier) of a hydrophilic group bonded thereto; and the platinum particles have an average particle size of 3.5 to 8.0 nm and the platinum specific surface area based on CO adsorption (COMSA) of 40 to 100 m2/g. The catalyst for a polymer electrolyte fuel cell according to the present invention is a catalyst excellent in initial activity and satisfactory in durability.
    Type: Application
    Filed: December 2, 2011
    Publication date: September 19, 2013
    Applicant: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima