Patents by Inventor Kenichiro Ota
Kenichiro Ota 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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Publication number: 20200406241Abstract: An object of the invention is to provide an oxygen reduction catalyst composed of a titanium oxynitride having high oxygen reduction capacity. The oxygen reduction catalyst of the invention is a titanium oxynitride that has a nitrogen element content of 0.1 to 2.0 mass %, has a crystal structure of rutile titanium dioxide in a powder X-ray diffraction measurement, and has a signal intensity ratio N—Ti—N/O—Ti—N in an X-ray photoelectron spectroscopic analysis of in the range of 0.01 to 0.50. Further, the oxygen reduction catalyst of the invention is a titanium oxynitride that includes titanium oxide particles, has a crystal structure of rutile titanium dioxide, and has an amorphous layer in a surface layer of the titanium oxide particles.Type: ApplicationFiled: December 22, 2017Publication date: December 31, 2020Applicants: SHOWA DENKO K.K., NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITYInventors: Kunchan LEE, Yoshinori YAMATO, Kenichiro OTA, Akimitsu ISHIHARA
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Patent number: 10658676Abstract: An object of the invention is to provide an oxygen reduction catalyst composed of a titanium oxynitride having high oxygen reduction capacity. The oxygen reduction catalyst of the invention is a titanium oxynitride that has a nitrogen element content of 8.0 to 15 mass %, has a crystal structure of anatase titanium dioxide in a powder X-ray diffraction measurement, and has a signal intensity ratio N—Ti—N/O—Ti—N in an X-ray photoelectron spectroscopic analysis of in the range of 0.35 to 0.70.Type: GrantFiled: December 22, 2017Date of Patent: May 19, 2020Assignees: SHOWA DENKO K.K., NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITYInventors: Kunchan Lee, Yoshinori Yamato, Kenichiro Ota, Akimitsu Ishihara
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Publication number: 20190386319Abstract: An object of the invention is to provide an oxygen reduction catalyst composed of a titanium oxynitride having high oxygen reduction capacity. The oxygen reduction catalyst of the invention is a titanium oxynitride that has a nitrogen element content of 8.0 to 15 mass %, has a crystal structure of anatase titanium dioxide in a powder X-ray diffraction measurement, and has a signal intensity ratio N—Ti—N/O—Ti—N in an X-ray photoelectron spectroscopic analysis of in the range of 0.35 to 0.70.Type: ApplicationFiled: December 22, 2017Publication date: December 19, 2019Applicants: SHOWA DENKO K.K., NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITYInventors: Kunchan LEE, Yoshinori YAMATO, Kenichiro OTA, Akimitsu ISHIHARA
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Patent number: 10050282Abstract: The present invention provides a novel oxygen reduction catalyst having a good stability and a high oxygen reduction performance. The oxygen reduction catalyst includes: a conductive oxide; and an oxide(s), having oxygen holes and provided at least on the surface of the conductive oxide, of at least one or more transition metals selected from the group consisting of Ti, Zr, Nb and Ta.Type: GrantFiled: February 27, 2015Date of Patent: August 14, 2018Assignee: National University Corporation Yokohama National UniversityInventors: Kenichiro Ota, Akimitsu Ishihara, Shigenori Mitsushima, Makoto Hamazaki
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Patent number: 9630169Abstract: A semiconductor material of the present invention is a semiconductor material including an oxynitride containing at least one element selected from the Group 4 elements and Group 5 elements. In the oxynitride, part of at least one selected from oxygen and nitrogen is substituted with carbon. Nb is preferable as the Group 5 element.Type: GrantFiled: August 31, 2012Date of Patent: April 25, 2017Assignee: PANASONIC CORPORATIONInventors: Kazuhito Hato, Kenichi Tokuhiro, Takahiro Suzuki, Takaiki Nomura, Kenichiro Ota, Akimitsu Ishihara
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Publication number: 20170098830Abstract: The present invention provides a novel oxygen reduction catalyst having a good stability and a high oxygen reduction performance. The oxygen reduction catalyst includes: a conductive oxide; and an oxide(s), having oxygen holes and provided at least on the surface of the conductive oxide, of at least one or more transition metals selected from the group consisting of Ti, Zr, Nb and Ta.Type: ApplicationFiled: February 27, 2015Publication date: April 6, 2017Applicant: National University Corporation Yokohama National UniversityInventors: Kenichiro Ota, Akimitsu Ishihara, Shigenori Mitsushima, Makoto Hamazaki
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Patent number: 9190670Abstract: The invention provides catalysts that are not corroded in acidic electrolytes or at high potential and have excellent durability and high oxygen reducing ability. The catalyst includes a metal element M, carbon, nitrogen and oxygen, wherein the catalyst shows peaks at 1340 cm?1 to 1365 cm?1 and at 1580 cm?1 to 1610 cm?1 as analyzed by Raman spectroscopy and the metal element M is one selected from titanium, iron, niobium, zirconium and tantalum. The catalysts of the invention are stable and are not corroded in acidic electrolytes or at high potential, have high oxygen reducing ability and are inexpensive compared to platinum. Fuel cells having the catalysts are therefore relatively inexpensive and have high performance.Type: GrantFiled: April 27, 2010Date of Patent: November 17, 2015Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Takuya Imai, Toshikazu Shishikura, Ryuji Monden, Kenichiro Ota
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Patent number: 9136541Abstract: Provided is a process for producing a fuel cell electrode catalyst having high catalytic activity which uses a transition metal, e.g., titanium, which process comprises thermal treatment at relatively low temperature, i.e., not including thermal treatment at high temperature (calcining) step. The process for producing a fuel cell electrode catalyst comprises a step (1) of mixing at least a transition metal-containing compound, a nitrogen-containing organic compound and a solvent to provide a catalyst precursor solution; a step (2) of removing the solvent from the catalyst precursor solution; and a step (3) of thermally treating a solid residue obtained in the step (2) at a temperature of 500 to 1100° C. to provide an electrode catalyst; wherein the transition metal-containing compound is partly or wholly a compound comprising at least one transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element.Type: GrantFiled: February 9, 2011Date of Patent: September 15, 2015Assignee: SHOWA DENKO K.K.Inventors: Kunchan Lee, Ryoko Konta, Masaki Horikita, Chunfu Yu, Yasuaki Wakizaka, Kenichiro Ota, Ryuji Monden, Kazunori Ichioka, Takashi Sato, Takuya Imai
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Patent number: 9083051Abstract: Provided is a process for producing a fuel cell electrode catalyst having high catalytic activity which uses a transition metal, e.g., titanium, which process comprises thermal treatment at relatively low temperature, i.e., not including thermal treatment at high temperature (calcining) step. The process for producing a fuel cell electrode catalyst comprises a step (1) of mixing at least a transition metal-containing compound, a nitrogen-containing organic compound and a solvent to provide a catalyst precursor solution; a step (2) of removing the solvent from the catalyst precursor solution; and a step (3) of thermally treating a solid residue obtained in the step (2) at a temperature of 500 to 1100° C. to provide an electrode catalyst; wherein the transition metal-containing compound is partly or wholly a compound comprising at least one transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element.Type: GrantFiled: February 9, 2011Date of Patent: July 14, 2015Assignee: SHOWA DENKO K.K.Inventors: Kunchan Lee, Ryoko Konta, Masaki Horikita, Chunfu Yu, Yasuaki Wakizaka, Kenichiro Ota, Ryuji Monden, Kazunori Ichioka, Takashi Sato, Takuya Imai
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Patent number: 9048499Abstract: [Object] The invention provides catalysts that are not corroded in acidic electrolytes or at high potential and have excellent durability and high oxygen reducing ability. [Solution] A catalyst of the invention includes a metal oxycarbonitride that contains titanium and at least one metal (hereinafter, also referred to as “metal M” or simply “M”) selected from silver, calcium, strontium, yttrium, ruthenium, lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.Type: GrantFiled: May 11, 2010Date of Patent: June 2, 2015Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Ryuji Monden, Toshikazu Shishikura, Takuya Imai, Kenichiro Ota
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Publication number: 20140308592Abstract: A method of manufacturing a dispersion liquid for an electrode catalyst, the method comprising a step of supporting a precious metal on the surface of a carrier by an electrodeposition process using a raw material mixed solution in which a particulate carrier is dispersed in a solvent and a compound including the precious metal element is dissolved in the solvent, wherein the carrier has oxygen reduction capability and is free of precious metal elements.Type: ApplicationFiled: September 5, 2012Publication date: October 16, 2014Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Hajime Maki, Yutaka Ito, Yoshinari Sawabe, Kenichiro Ota
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Publication number: 20140224665Abstract: A semiconductor material of the present invention is a semiconductor material including an oxynitride containing at least one element selected from the Group 4 elements and Group 5 elements. In the oxynitride, part of at least one selected from oxygen and nitrogen is substituted with carbon. Nb is preferable as the Group 5 element.Type: ApplicationFiled: August 31, 2012Publication date: August 14, 2014Applicant: PANASONIC CORPORATIONInventors: Kazuhito Hato, Kenichi Tokuhiro, Takahiro Suzuki, Takaiki Nomura, Kenichiro Ota, Akimitsu Ishihara
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Patent number: 8716167Abstract: [Problem] To provide a catalyst which has high oxygen reduction activity, also has excellent durability, and is inexpensive and excellent in electric power generation cost as compared with noble metal catalysts such as platinum. [Solution to problem] A catalyst for a polymer electrolyte fuel cell, including a graphitized carbon powder and a niobium oxycarbonitride or a titanium oxycarbonitride as an active substance, and a polymer electrolyte fuel cell using the catalyst.Type: GrantFiled: June 2, 2010Date of Patent: May 6, 2014Assignee: Showa Denko K.K.Inventors: Toshikazu Shishikura, Ryuji Monden, Kunchan Lee, Yasuaki Wakizaka, Kenichiro Ota
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Publication number: 20130192985Abstract: An electrode catalyst, including: a metal compound which contains an oxygen atom and at least one metal element selected from a group consisting of Group 4 elements and Group 5 elements in the long-form periodic table, and a carbonaceous material which covers at least part of the metal compound; wherein an oxygen deficiency index, which is represented as an inverse number of a peak value of a first nearest neighbor element in a radial distribution function obtained by Fourier-transforming an EXAFS oscillation in EXAFS measurement of the metal element, is 0.125 to 0.170; and a crystallinity index, which is represented as a peak value of a second nearest neighbor element in the radial distribution function, is 4.5 to 8.0.Type: ApplicationFiled: July 6, 2011Publication date: August 1, 2013Applicants: NEC CORPORATION, SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Takeshi Hattori, Yutaka Ito, Hajime Maki, Hideto Imai, Kenichiro Ota
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Publication number: 20130115542Abstract: A method for producing a fuel cell catalyst containing a metal oxycarbonitride, the method including: a step of producing a metal oxycarbonitride by heating a metal carbonitride in an inert gas containing oxygen gas; and a step of bringing the metal oxycarbonitride into contact with an acidic solution.Type: ApplicationFiled: June 13, 2011Publication date: May 9, 2013Applicant: SHOWA DENKO K.K.Inventors: Takuya Imai, Yasuaki Wakizaka, Kenichiro Ota
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Patent number: 8404610Abstract: It is an object of the present invention to provide a production process which can produce a fuel cell catalyst having excellent durability and high oxygen reducing activity. The process for producing a fuel cell catalyst including a metal-containing oxycarbonitride of the present invention includes a grinding step for grinding the oxycarbonitride using a ball mill, wherein the metal-containing oxycarbonitride is represented by a specific compositional formula; balls in the ball mill have a diameter of 0.1 to 1.0 mm; the grinding time using the ball mill is 1 to 45 minutes; the rotating centrifugal acceleration in grinding using the ball mill is 2 to 20 G; the grinding using the ball mill is carried out in such a state that the metal-containing oxycarbonitride is mixed with a solvent containing no oxygen atom in the molecule; and when the ball mill is a planetary ball mill, the orbital centrifugal acceleration mill is 5 to 50 G.Type: GrantFiled: July 14, 2010Date of Patent: March 26, 2013Assignee: Showa Denko K.K.Inventors: Yasuaki Wakizaka, Ryuji Monden, Toshikazu Shishikura, Takuya Imai, Kenichiro Ota
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Publication number: 20120315568Abstract: Provided is a process for producing a fuel cell electrode catalyst having high catalytic activity which uses a transition metal, e.g., titanium, which process comprises thermal treatment at relatively low temperature, i.e., not including thermal treatment at high temperature (calcining) step. The process for producing a fuel cell electrode catalyst comprises a step (1) of mixing at least a transition metal-containing compound, a nitrogen-containing organic compound and a solvent to provide a catalyst precursor solution; a step (2) of removing the solvent from the catalyst precursor solution; and a step (3) of thermally treating a solid residue obtained in the step (2) at a temperature of 500 to 1100° C. to provide an electrode catalyst; wherein the transition metal-containing compound is partly or wholly a compound comprising at least one transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element.Type: ApplicationFiled: February 9, 2011Publication date: December 13, 2012Applicant: SHOWA DENKO K.K.Inventors: Kunchan Lee, Ryoko Konta, Masaki Horikita, Chunfu Yu, Yasuaki Wakizaka, Kenichiro Ota, Ryuji Monden, Kazunori Ichioka, Takashi Sato, Takuya Imai
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Publication number: 20120258381Abstract: There is provided an ink for forming a fuel cell catalyst layer that is capable of efficiently forming a high-performance fuel cell catalyst layer inexpensively. The ink for forming a fuel cell catalyst layer of the present invention comprises a fuel cell catalyst, an electron conductive material, a proton conductive material and a solvent, wherein the fuel cell catalyst comprises a metal-containing oxycarbonitride that contains niobium and/or titanium; the mass ratio [(A)/(B)] of the content (A) of the fuel cell catalyst to the content (B) of the electron conductive material is 1 to 6; and the mass ratio [(D)/(C)] of the content (D) of the proton conductive material to the total content (C) of the fuel cell catalyst and the electron conductive material is 0.2 to 0.6.Type: ApplicationFiled: December 13, 2010Publication date: October 11, 2012Applicant: SHOWA DENKO K.K.Inventors: Takuya Imai, Yasuaki Wakizaka, Toshikazu Shishikura, Masaki Horikita, Kenichiro Ota
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Publication number: 20120115064Abstract: It is an object of the present invention to provide a production process which can produce a fuel cell catalyst having excellent durability and high oxygen reducing activity. The process for producing a fuel cell catalyst including a metal-containing oxycarbonitride of the present invention includes a grinding step for grinding the oxycarbonitride using a ball mill, wherein the metal-containing oxycarbonitride is represented by a specific compositional formula; balls in the ball mill have a diameter of 0.1 to 1.0 mm; the grinding time using the ball mill is 1 to 45 minutes; the rotating centrifugal acceleration in grinding using the ball mill is 2 to 20 G; the grinding using the ball mill is carried out in such a state that the metal-containing oxycarbonitride is mixed with a solvent containing no oxygen atom in the molecule; and when the ball mill is a planetary ball mill, the orbital centrifugal acceleration mill is 5 to 50 G.Type: ApplicationFiled: July 14, 2010Publication date: May 10, 2012Applicant: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Ryuji Monden, Toshikazu Shishikura, Takuya Imai, Kenichiro Ota
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Publication number: 20120094825Abstract: A method for producing an electrode catalyst, comprising a step of calcining a precursor of the electrode catalyst under conditions under which a second material defined below can change into a carbonaceous material, the precursor having been obtained by continuously hydrothermally reacting a mixture containing a first material defined below and the second material defined below in the presence of supercritical or subcritical water, wherein the first material is defined to be a metal compound composed of one or more metal elements selected from the group consisting of the elements of Group 4A and the elements of Group 5A group and one or more non-metal elements selected from the group consisting of hydrogen, nitrogen, chlorine, carbon, boron, sulfur, and oxygen, and the second material is defined to be a precursor of a carbonaceous material.Type: ApplicationFiled: June 16, 2010Publication date: April 19, 2012Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Takeshi Hattori, Yutaka Ito, Hajime Maki, Kenichiro Ota