Patents by Inventor Ikuo Nagashima
Ikuo Nagashima 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: 11866834Abstract: The present invention provides an electrode for electrolysis in which electrolysis performance is hard to deteriorate and excellent catalytic activity is kept stable over a long period of time even when electric power in which there is a large fluctuation in output, such as renewable energy, is used as a power source. The electrode for electrolysis is an electrode 10 for electrolysis provided with an electrically conductive substrate 2 at least the surface of which contains nickel or a nickel-based alloy, an intermediate layer 4 formed on the surface of the electrically conductive substrate 2 and containing a lithium-containing nickel oxide represented by composition formula LixNi2-xO2 (0.02?x?0.5), and a catalyst layer 6 of a nickel cobalt spinel oxide, an iridium oxide, or the like, the catalyst layer 6 formed on the surface of the intermediate layer 4.Type: GrantFiled: March 4, 2019Date of Patent: January 9, 2024Assignees: DE NORA PERMELEC LTD, KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Shigenori Mitsushima, Yoshiyuki Kuroda, Ikuo Nagashima, Tatsuya Taniguchi, Yoshinori Nishiki, Akihiro Kato, Awaludin Zaenal, Fumiya Tsujii, Takaaki Nakai
-
Patent number: 11692276Abstract: The present invention realizes industrially excellent effects such that when electric power having a large output fluctuation, such as renewable energy, is used as a power source, electrolysis performance is unlikely to be deteriorated and excellent catalytic activity is retained stably over a longer period of time, and in addition, the present invention provides a technique that enables forming a catalyst layer of an oxygen generation anode, which gives such excellent effects, with a more versatile materials and by a simple electrolysis method.Type: GrantFiled: March 8, 2021Date of Patent: July 4, 2023Assignees: DE NORA PERMELEC LTD, KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITYInventors: Shigenori Mitsushima, Yoshiyuki Kuroda, Shohei Takatsu, Ikuo Nagashima, Tatsuya Taniguchi, Akihiko Inomata, Ayaka Nagai, Yoshinori Nishiki, Akihiro Kato, Awaludin Zaenal, Takaaki Nakai
-
Publication number: 20230109702Abstract: The present invention realizes industrially excellent effects such that when electric power having a large output fluctuation, such as renewable energy, is used as a power source, electrolysis performance is unlikely to be deteriorated and excellent catalytic activity is retained stably over a longer period of time, and in addition, the present invention provides a technique that enables forming a catalyst layer of an oxygen generation anode, which gives such excellent effects, with a more versatile materials and by a simple electrolysis method.Type: ApplicationFiled: March 8, 2021Publication date: April 13, 2023Inventors: Shigenori MITSUSHIMA, Yoshiyuki KURODA, Shohei TAKATSU, Ikuo NAGASHIMA, Tatsuya TANIGUCHI, Akihiko INOMATA, Ayaka NAGAI, Yoshinori NISHIKI, Akihiro KATO, Awaludin ZAENAL, Takaaki NAKAI
-
Patent number: 11060198Abstract: A water electrolysis system includes: a water electrolysis tank; a cathode side gas passage through which a cathode side gas flows; a monitoring device configured to monitor at least one of a hydrogen concentration of the cathode side gas in the cathode side gas passage, an oxygen concentration of the cathode side gas in the cathode side gas passage, and an amount of electric power supplied to the water electrolysis tank; a hydrogen supply passage through which a hydrogen gas is supplied to the cathode side gas in the cathode side gas passage to increase the hydrogen concentration of the cathode side gas; and a flow regulating valve configured to regulate a flow rate of the hydrogen gas supplied through the hydrogen supply passage to the cathode side gas.Type: GrantFiled: February 15, 2018Date of Patent: July 13, 2021Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tatsuya Taniguchi, Ayaka Oishi, Ikuo Nagashima
-
Publication number: 20200407860Abstract: The present invention provides an electrode for electrolysis in which electrolysis performance is hard to deteriorate and excellent catalytic activity is kept stable over a long period of time even when electric power in which there is a large fluctuation in output, such as renewable energy, is used as a power source. The electrode for electrolysis is an electrode 10 for electrolysis provided with an electrically conductive substrate 2 at least the surface of which contains nickel or a nickel-based alloy, an intermediate layer 4 formed on the surface of the electrically conductive substrate 2 and containing a lithium-containing nickel oxide represented by composition formula LixNi2-xO2 (0.02?x?0.5), and a catalyst layer 6 of a nickel cobalt spinel oxide, an iridium oxide, or the like, the catalyst layer 6 formed on the surface of the intermediate layer 4.Type: ApplicationFiled: March 4, 2019Publication date: December 31, 2020Inventors: Shigenori MITSUSHIMA, Yoshiyuki KURODA, Ikuo NAGASHIMA, Tatsuya TANIGUCHI, Yoshinori NISHIKI, Akihiro KATO, Awaludin ZAENAL, Fumiya TSUJII, Takaaki NAKAI
-
Patent number: 10676832Abstract: Provided is a method capable of producing, in a simple and low-cost manner, an electrolysis electrode which can be used in alkaline water electrolysis and has superior durability against output variation. The method for producing an anode for alkaline water electrolysis includes: a step of dissolving lithium nitrate and a nickel carboxylate in water to prepare an aqueous solution containing lithium ions and nickel ions, a step of applying the aqueous solution to the surface of a conductive substrate having at least the surface composed of nickel or a nickel-based alloy, and a step of subjecting the conductive substrate to which the aqueous solution has been applied to a heat treatment at a temperature within a range from at least 450° C. to not more than 600° C., thereby forming a catalyst layer composed of a lithium-containing nickel oxide on the conductive substrate.Type: GrantFiled: September 11, 2017Date of Patent: June 9, 2020Assignees: DE NORA PERMELEC LTD, NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY, KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Shigenori Mitsushima, Sho Fujita, Ikuo Nagashima, Yoshinori Nishiki, Akiyoshi Manabe, Akihiro Kato
-
Anode for alkaline water electrolysis and method for producing anode for alkaline water electrolysis
Patent number: 10619255Abstract: Provided are an anode for alkaline water electrolysis that can achieve a low overpotential at low cost, and a method for producing the anode for alkaline water electrolysis. An anode for alkaline water electrolysis having electrode catalyst layers 2, 3 composed of a first catalyst component having either a nickel-cobalt spinel oxide or a lanthanide-nickel-cobalt perovskite oxide and a second catalyst component having at least one of iridium oxide and ruthenium oxide formed on the surface of a conductive substrate 1 composed of nickel or a nickel-based alloy, and a method for producing the anode for alkaline water electrolysis.Type: GrantFiled: April 5, 2017Date of Patent: April 14, 2020Assignees: DE NORA PERMELEC LTD, KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kato, Fumiya Tsujii, Yuji Kamei, Ikuo Shimomura, Ikuo Nagashima -
Publication number: 20190271091Abstract: A water electrolysis system includes: a water electrolysis tank; a cathode side gas passage through which a cathode side gas flows; a monitoring device configured to monitor at least one of a hydrogen concentration of the cathode side gas in the cathode side gas passage, an oxygen concentration of the cathode side gas in the cathode side gas passage, and an amount of electric power supplied to the water electrolysis tank; a hydrogen supply passage through which a hydrogen gas is supplied to the cathode side gas in the cathode side gas passage to increase the hydrogen concentration of the cathode side gas; and a flow regulating valve configured to regulate a flow rate of the hydrogen gas supplied through the hydrogen supply passage to the cathode side gas.Type: ApplicationFiled: February 15, 2018Publication date: September 5, 2019Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tatsuya TANIGUCHI, Ayaka OISHI, Ikuo NAGASHIMA
-
Publication number: 20190226102Abstract: Provided is a method capable of producing, in a simple and low-cost manner, an electrolysis electrode which can be used in alkaline water electrolysis and has superior durability against output variation. The method for producing an anode for alkaline water electrolysis includes: a step of dissolving lithium nitrate and a nickel carboxylate in water to prepare an aqueous solution containing lithium ions and nickel ions, a step of applying the aqueous solution to the surface of a conductive substrate having at least the surface composed of nickel or a nickel-based alloy, and a step of subjecting the conductive substrate to which the aqueous solution has been applied to a heat treatment at a temperature within a range from at least 450° C. to not more than 600° C., thereby forming a catalyst layer composed of a lithium-containing nickel oxide on the conductive substrate.Type: ApplicationFiled: September 11, 2017Publication date: July 25, 2019Inventors: Shigenori MITSUSHIMA, Sho FUJITA, Ikuo NAGASHIMA, Yoshinori NISHIKI, Akiyoshi MANABE, Akihiro KATO
-
ANODE FOR ALKALINE WATER ELECTROLYSIS AND METHOD FOR PRODUCING ANODE FOR ALKALINE WATER ELECTROLYSIS
Publication number: 20190078220Abstract: Provided are an anode for alkaline water electrolysis that can achieve a low overpotential at low cost, and a method for producing the anode for alkaline water electrolysis. An anode for alkaline water electrolysis having electrode catalyst layers 2, 3 composed of a first catalyst component having either a nickel-cobalt spinel oxide or a lanthanide-nickel-cobalt perovskite oxide and a second catalyst component having at least one of iridium oxide and ruthenium oxide formed on the surface of a conductive substrate 1 composed of nickel or a nickel-based alloy, and a method for producing the anode for alkaline water electrolysis.Type: ApplicationFiled: April 5, 2017Publication date: March 14, 2019Inventors: Akihiro KATO, Fumiya TSUJII, Yuji KAMEI, Ikuo SHIMOMURA, Ikuo NAGASHIMA -
Patent number: 10088706Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light extended in the same direction as the first linear light, a reflecting bar for reflecting the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. The first linear light and the second linear light are reflected by the reflecting bar and the reflecting surface, and are emitted from the opening portion.Type: GrantFiled: August 10, 2015Date of Patent: October 2, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Nami Okimoto, Saki Maeda, Eiji Niikura, Tomohiko Sawanaka, Masaaki Takeshima, Ikuo Nagashima
-
Publication number: 20160237578Abstract: An anode for alkaline water electrolysis includes a conductive substrate having at least a surface made of nickel or a nickel-base alloy and a lithium-containing nickel oxide catalytic layer formed on a surface of the substrate. The molar ratio (Li/Ni) of lithium and nickel in the catalytic layer is in the range of 0.005 to 0.15.Type: ApplicationFiled: October 29, 2014Publication date: August 18, 2016Inventors: Hiroki ICHIKAWA, Shigenori MITSUSHIMA, Ikuo NAGASHIMA, Yoshio SUNADA, Akihiro KATO, Liang YIN, Akiyoshi MANABE, Yoshinoñ NISHIKI
-
Publication number: 20160054517Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light extended in the same direction as the first linear light, a reflecting bar for reflecting the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. The first linear light and the second linear light are reflected by the reflecting bar and the reflecting surface, and are emitted from the opening portion.Type: ApplicationFiled: August 10, 2015Publication date: February 25, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Nami OKIMOTO, Saki MAEDA, Eiji NIIKURA, Tomohiko SAWANAKA, Masaaki TAKESHIMA, Ikuo NAGASHIMA
-
Patent number: 9214663Abstract: In an alkaline storage battery positive electrode, the surface of positive electrode active material particles is uniformly coated with a conductive agent and the alkaline storage battery positive electrode is capable of suppressing an increase in internal battery resistance. The method of fabricating includes: (A) fixing active material particles to a current collector, the active material particles containing, as a main component, nickel hydroxide coated with a conductive agent, the conductive agent containing, as a main component, at least one kind of cobalt compound selected from the group consisting of cobalt hydroxide, tricobalt tetroxide, and cobalt oxyhydroxide; and (B) reducing the cobalt atom in the cobalt compound such that the cobalt atom has an oxidation number of less than +2, by applying a reduction current in an electrolyte solution to the current collector to which the active material particles are fixed, after the step (A).Type: GrantFiled: October 28, 2011Date of Patent: December 15, 2015Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Kosuke Nakayama, Ikuo Nagashima, Kenjin Higaki
-
Publication number: 20130273420Abstract: In an alkaline storage battery positive electrode, the surface of positive electrode active material particles is uniformly coated with a conductive agent and the alkaline storage battery positive electrode is capable of suppressing an increase in internal battery resistance. The method of fabricating includes: (A) fixing active material particles to a current collector, the active material particles containing, as a main component, nickel hydroxide coated with a conductive agent, the conductive agent containing, as a main component, at least one kind of cobalt compound selected from the group consisting of cobalt hydroxide, tricobalt tetroxide, and cobalt oxyhydroxide; and (B) reducing the cobalt atom in the cobalt compound such that the cobalt atom has an oxidation number of less than +2, by applying a reduction current in an electrolyte solution to the current collector to which the active material particles are fixed, after the step (A).Type: ApplicationFiled: October 28, 2011Publication date: October 17, 2013Applicant: KAWASAKI JUKOGYO KABUISHIKI KAISHAInventors: Kosuke Nakayama, Ikuo Nagashima, Kenjin Higaki
-
Patent number: 4814241Abstract: An electrolyte for a Redox flow battery contains from 1 to 4 normal hydrochloric acid and at least 0.5 mole/liter of an active material, and further contains from 0.1 to 4 normalities of an acid comprising an anion which does not inhibit the electrode reactions in addition to the hydrochloric acid. This electrolyte reduces the cell resistivity and improves the solubility of active materials.Type: GrantFiled: March 16, 1987Date of Patent: March 21, 1989Assignees: Director-General, Agency of Industrial Science and Technology, Kawasaki Jukogyo Kabushiki KaishaInventors: Ikuo Nagashima, Jun Fukui, Hiroshi Gotoh, Hiroko Kaneko, Ken Nozaki, Takeo Ozawa