Patents by Inventor Naoki Takehiro

Naoki Takehiro 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: 10847816
    Abstract: A fuel cell includes a power-generation channel provided on a surface of a cathode-side separator which faces a MEA and a cooling channel provided on a surface of the cathode-side separator opposite to the MEA. Air flows through the power-generation channel and the cooling channel. The cooling channel is separated from the power-generation channel by a side wall. The cross-sectional area of the power-generation channel on the air outlet side is smaller than that of the power-generation channel at a position upstream of the air outlet side, and the cross-sectional area of the cooling channel on the air outlet side is larger than that of the cooling channel at a position upstream of the air outlet side. A through-hole is provided in a side wall that separates the power-generation channel from the cooling channel.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: November 24, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Takehiro, Makoto Adachi
  • Patent number: 10431831
    Abstract: A catalyst particle is composed of an inner particle and an outermost layer that includes platinum and covers the inner particle. The inner particle includes on at least a surface thereof a first oxide having an oxygen defect.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: October 1, 2019
    Assignees: Toyota Jidosha Kabushiki Kaisha, University of Miyazaki
    Inventors: Go Sakai, Tatsuya Arai, Tetsuya Ogawa, Koshi Sekizawa, Naoki Takehiro
  • Patent number: 10243218
    Abstract: An object of the present invention is to provide a method for producing fine catalyst particles, a method for producing carbon-supported fine catalyst particles, a method for producing a catalyst mix, and a method for producing an electrode, all of which are configured to inhibit, when used in fuel cells, etc., performance deterioration during operation at especially high temperature. Disclosed is a method for producing fine catalyst particles each comprising a core particle and an outermost layer, the core particle containing palladium and the outermost layer containing platinum and covering the core particle, the method comprising the steps of: preparing palladium-containing particles; preparing an acid solution configured to dissolve palladium more preferentially than platinum; covering each palladium-containing particle with an outermost layer containing platinum; and bringing the palladium-containing particles each covered with the outermost layer into contact with the acid solution.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: March 26, 2019
    Assignees: Toyota Jidosha Kabushiki Kaisha, Audi AG
    Inventors: Atsuo Iio, Naoki Takehiro, Tatsuya Arai
  • Patent number: 9950314
    Abstract: The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: April 24, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Makoto Adachi, Naoki Takehiro, Keiichi Kaneko
  • Publication number: 20180069256
    Abstract: A fuel cell is provided with: a membrane electrode assembly (MEA); and a cathode-side separator assembled to the MEA, the cathode-side separator including first passages on a first surface of the cathode-side separator on a side closer to the MEA, and second passages on a second surface of the cathode-side separator on an opposite side, the first and second passages allowing oxidant gas to flow through the first and second passages, respectively.
    Type: Application
    Filed: August 14, 2017
    Publication date: March 8, 2018
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Makoto ADACHI, Naoki TAKEHIRO, Masaaki MATSUSUE, Masayuki ITO, Hideo NAGAOSA
  • Publication number: 20170317362
    Abstract: A fuel cell includes a power-generation channel provided on a surface of a cathode-side separator which faces a MEA and a cooling channel provided on a surface of the cathode-side separator opposite to the MEA. Air flows through the power-generation channel and the cooling channel. The cooling channel is separated from the power-generation channel by a side wall. The cross-sectional area of the power-generation channel on the air outlet side is smaller than that of the power-generation channel at a position upstream of the air outlet side, and the cross-sectional area of the cooling channel on the air outlet side is larger than that of the cooling channel at a position upstream of the air outlet side. A through-hole is provided in a side wall that separates the power-generation channel from the cooling channel.
    Type: Application
    Filed: April 21, 2017
    Publication date: November 2, 2017
    Inventors: Naoki TAKEHIRO, Makoto ADACHI
  • Publication number: 20170282171
    Abstract: A catalyst particle is composed of an inner particle and an outermost layer that includes platinum and covers the inner particle. The inner particle includes on at least a surface thereof a first oxide having an oxygen defect.
    Type: Application
    Filed: April 13, 2017
    Publication date: October 5, 2017
    Applicants: Toyota Jidosha Kabushiki Kaisha, University of Miyazaki
    Inventors: Go Sakai, Tatsuya Arai, Tetsuya Ogawa, Koshi Sekizawa, Naoki Takehiro
  • Patent number: 9627692
    Abstract: The present invention is to provide such a carbon-supported catalyst that an activity expected from a catalytic activity by rotating disk electrode (RDE) evaluation is maintained even after the formation of a membrane electrode assembly (MEA). Disclosed is a carbon-supported catalyst wherein the carbon-supported catalyst includes fine catalyst particles that have a palladium-containing particle and a platinum-containing outermost layer covering at least part of the palladium-containing particle, and a carbon support supporting the fine catalyst particles, and wherein, in a cyclic voltammogram that is obtained by measuring, in an acid solution, the carbon-supported catalyst applied to a measurement electrode made of an electroconductive material, the proportion of the area of a hydrogen adsorption region that appears in a reduction current region to the total area of the hydrogen adsorption region and a hydrogen occlusion region that appears in the reduction current region, is 29% to 36%.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: April 18, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiichi Kaneko, Naoki Takehiro, Norimitsu Takeuchi
  • Publication number: 20170028385
    Abstract: The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed.
    Type: Application
    Filed: April 3, 2015
    Publication date: February 2, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Makoto ADACHI, Naoki TAKEHIRO, Keiichi KANEKO
  • Publication number: 20160344038
    Abstract: The present invention is to provide such a carbon-supported catalyst that an activity expected from a catalytic activity by rotating disk electrode (RDE) evaluation is maintained even after the formation of a membrane electrode assembly (MEA). Disclosed is a carbon-supported catalyst wherein the carbon-supported catalyst includes fine catalyst particles that have a palladium-containing particle and a platinum-containing outermost layer covering at least part of the palladium-containing particle, and a carbon support supporting the fine catalyst particles, and wherein, in a cyclic voltammogram that is obtained by measuring, in an acid solution, the carbon-supported catalyst applied to a measurement electrode made of an electroconductive material, the proportion of the area of a hydrogen adsorption region that appears in a reduction current region to the total area of the hydrogen adsorption region and a hydrogen occlusion region that appears in the reduction current region, is 29% to 36%.
    Type: Application
    Filed: January 6, 2015
    Publication date: November 24, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Keiichi KANEKO, Naoki TAKEHIRO, Norimitsu TAKEUCHI
  • Patent number: 9385377
    Abstract: An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: July 5, 2016
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AUDI AG
    Inventors: Keiichi Kaneko, Naoki Takehiro, Takumi Taniguchi, Tatsuya Arai, Noriyuki Kitao, Makoto Adachi, Hiroko Kimura
  • Publication number: 20150318560
    Abstract: An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle.
    Type: Application
    Filed: November 7, 2012
    Publication date: November 5, 2015
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, BALLARD POWER SYSTEMS INC.
    Inventors: Keiichi KANEKO, Naoki TAKEHIRO, Takumi TANIGUCHI, Tatsuya ARAI, Noriyuki KITAO, Makoto ADACHI, Hiroko KIMURA
  • Patent number: 9002689
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: April 7, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura
  • Publication number: 20150093682
    Abstract: The present invention is to provide a method for producing a catalyst for fuel cells with excellent durability, and a fuel cell comprising a catalyst for fuel cells produced by the production method. Disclosed is a method for producing a catalyst for fuel cells, the catalyst comprising fine catalyst particles, each of which comprises a palladium-containing core particle and a platinum-containing outermost layer covering the core particle, and carbon supports on which the fine catalyst particles are supported, wherein the method comprises the steps of: preparing carbon supports on which palladium-containing particles are supported; fining the carbon supports; and covering the palladium-containing particles with a platinum-containing outermost layer after the fining step.
    Type: Application
    Filed: January 21, 2013
    Publication date: April 2, 2015
    Inventors: Hiroko Kimura, Naoki Takehiro
  • Patent number: 8843355
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: September 23, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura
  • Patent number: 8785078
    Abstract: The present invention provides a fuel cell which is capable of improving electric power generation efficiency at a time of high-temperature operation. The fuel cell 10 comprising: a membrane electrode assembly 4; and a pair of gas separators 7, 8 sandwiching the membrane electrode assembly 4 therebetween, wherein at least one of the gas separator(s) 7 and/or 8 comprises a compact layer(s) 7c and/or 8c which is capable of preventing permeation of fluid and a porous layer (s) 7d and/or 8d which allows permeation of fluid, and the porous layer(s) 7d and/or 8d is impregnated with a water-soluble liquid having higher boiling point than that of water.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: July 22, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro
  • Publication number: 20140200133
    Abstract: The present invention provides core-shell type metal nanoparticles having a high surface coverage of the core portion with the shell portion, and a method for producing the same. Disclosed is core-shell type metal nanoparticles comprising a core portion comprising a core metal material and a shell portion covering the core portion, wherein the core portion substantially has no {100} plane of the core metal material on the surface thereof.
    Type: Application
    Filed: March 14, 2014
    Publication date: July 17, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroko KIMURA, Naoki TAKEHIRO, Koshi SEKIZAWA, Atsuo IIO, Tatsuya ARAI
  • Publication number: 20140178575
    Abstract: An object of the present invention is to provide a method for producing fine catalyst particles, a method for producing carbon-supported fine catalyst particles, a method for producing a catalyst mix, and a method for producing an electrode, all of which are configured to inhibit, when used in fuel cells, etc., performance deterioration during operation at especially high temperature. Disclosed is a method for producing fine catalyst particles each comprising a core particle and an outermost layer, the core particle containing palladium and the outermost layer containing platinum and covering the core particle, the method comprising the steps of: preparing palladium-containing particles; preparing an acid solution configured to dissolve palladium more preferentially than platinum; covering each palladium-containing particle with an outermost layer containing platinum; and bringing the palladium-containing particles each covered with the outermost layer into contact with the acid solution.
    Type: Application
    Filed: November 16, 2011
    Publication date: June 26, 2014
    Inventors: Atsuo Iio, Naoki Takehiro, Tatsuya Arai
  • Patent number: 8735019
    Abstract: A fuel cell including a single fuel cell which includes a membrane electrode including a polymer electrolyte membrane, an anode electrode on one surface of the polymer electrolyte membrane, and a cathode electrode on another surface of the polymer electrolyte membrane, the anode electrode including an anode catalyst layer and a gas diffusion layer and the cathode electrode including a cathode catalyst layer and a gas diffusion layer. At least one of the anode cathode catalyst layers includes core-shell type catalyst particles, each having a core and a shell covering the core and including a shell metallic material. At least one of the polymer electrolyte membrane, anode catalyst layer, gas diffusion layer at the anode side, cathode catalyst layer and gas diffusion layer at the cathode side includes metallic nanoparticles having an average particle diameter different from that of the core-shell type catalyst particles and including the shell metallic material.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: May 27, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tatsuya Arai, Naoki Takehiro, Atsuo Iio, Koshi Sekizawa, Hiroko Kimura
  • Publication number: 20140120435
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Application
    Filed: January 7, 2014
    Publication date: May 1, 2014
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura