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).
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Patent number: 11527761Abstract: 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: GrantFiled: June 14, 2019Date of Patent: December 13, 2022Assignees: TANAKA KIKINZOKU KOGYO K.K., OSAKA UNIVERSITYInventors: Koichi Matsutani, Takeshi Kaieda, Yasushi Masahiro, Hideaki Kasai, Hiroshi Nakanishi, Koji Shimizu
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Patent number: 11239473Abstract: 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: GrantFiled: April 16, 2018Date of Patent: February 1, 2022Assignee: TANAKA KIKINZOKU KOGYO K.K.Inventors: Takeshi Kaieda, Koichi Matsutani
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Patent number: 11145874Abstract: 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: GrantFiled: April 16, 2018Date of Patent: October 12, 2021Assignee: TANAKA KIKINZOKU KOGYO K.K.Inventors: Koichi Matsutani, Wataru Hashimoto, Takeshi Kaieda
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Patent number: 10998556Abstract: 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: GrantFiled: September 7, 2017Date of Patent: May 4, 2021Assignee: TANAKA KIKINZOKU KOGYO K.K.Inventors: Wataru Hashimoto, Tatsunori Namai, Minoru Ishida, Hitoshi Nakajima, Kazuki Okaya, Takeshi Kaieda, Koichi Matsutani
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Publication number: 20210126264Abstract: 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: ApplicationFiled: April 16, 2018Publication date: April 29, 2021Applicant: TANAKA KIKINZOKU KOGYO K.K.Inventors: Koichi MATSUTANI, Wataru HASHIMOTO, Takeshi KAIEDA
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Publication number: 20200122123Abstract: 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: ApplicationFiled: August 29, 2017Publication date: April 23, 2020Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Wilson Agerico tan DIÑO, Bhume CHANTARAMOLEE, Ryo KISHIDA, Paulus Himawan LIM, Hiroshi NAKANISHI
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Publication number: 20200052309Abstract: 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: ApplicationFiled: April 16, 2018Publication date: February 13, 2020Applicant: TANAKA KIKINZOKU KOGYO K.K.Inventors: Takeshi KAIEDA, Koichi MATSUTANI
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Patent number: 10497942Abstract: 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: GrantFiled: March 2, 2016Date of Patent: December 3, 2019Assignee: TANAKA KIKINZOKU KOGYO K.K.Inventors: Koichi Matsutani, Takeshi Kaieda, Tomohiro Akiyama
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Publication number: 20190296363Abstract: 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: ApplicationFiled: June 14, 2019Publication date: September 26, 2019Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Hideaki KASAI, Hiroshi NAKANISHI, Koji SHIMIZU
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Publication number: 20190221858Abstract: 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: ApplicationFiled: September 7, 2017Publication date: July 18, 2019Inventors: Wataru HASHIMOTO, Tatsunori NAMAI, Minoru ISHIDA, Hitoshi NAKAJIMA, Kazuki OKAYA, Takeshi KAIEDA, Koichi MATSUTANI
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Publication number: 20180138518Abstract: 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: ApplicationFiled: June 17, 2016Publication date: May 17, 2018Applicants: TANAKA KIKINZOKU KOGYO K.K., OSAKA UNIVERSITYInventors: Koichi MATSUTANI, Takeshi KAIEDA, Yasushi MASAHIRO, Hideaki KASAI, Hiroshi NAKANISHI, Koji SHIMIZU
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Publication number: 20180034062Abstract: 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: ApplicationFiled: March 2, 2016Publication date: February 1, 2018Applicant: Tanaka Kikinzoku Kogyo K.K.Inventors: Koichi MATSUTANI, Takeshi KAIEDA, Tomohiro AKIYAMA
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Patent number: 9368805Abstract: 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: GrantFiled: December 2, 2011Date of Patent: June 14, 2016Assignee: TANAKA KIKINZOKU KOGYO K.KInventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima
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Publication number: 20130244137Abstract: 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: ApplicationFiled: December 2, 2011Publication date: September 19, 2013Applicant: TANAKA KIKINZOKU KOGYO K.K.Inventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima