Kawasaki Jukogyo Kabushiki Kaisha

De Nora Permelec Ltd

Yokohama National University

Director General Agency of Industrial Science and Technology

National University Corporation Yokohama National University

Ikuo Nagashima

Akihiro Kato

Yoshinori Nishiki

Shigenori Mitsushima

Tatsuya Taniguchi

Awaludin Zaenal

Yoshiyuki Kuroda

Takaaki Nakai

Fumiya Tsujii

Hiroshi Gotoh

Hiroko Kaneko

Akiyoshi Manabe

Ken Nozaki

Yuji Kamei

Akihiko Inomata

Takeo Ozawa

Ikuo Shimomura

Jun Fukui

Shohei Takatsu

Ayaka Nagai

Sho Fujita

Ayaka Oishi

Kosuke Nakayama

Kenjin Higaki

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 electrodefor electrolysis provided with an electrically conductive substrateat least the surface of which contains nickel or a nickel-based alloy, an intermediate layerformed on the surface of the electrically conductive substrateand containing a lithium-containing nickel oxide represented by composition formula LiNiO(0.02≤x≤0.5), and a catalyst layerof a nickel cobalt spinel oxide, an iridium oxide, or the like, the catalyst layerformed on the surface of the intermediate layer

Electrolysis electrode and method for manufacturing same

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. Provided are an alkaline water electrolysis method including supplying an electrolyte obtained by dispersing a catalyst containing a hybrid nickel-iron hydroxide nanosheet (NiFe-ns) being a composite of a metal hydroxide and an organic substance to an anode chamber and a cathode chamber, and using the electrolyte for electrolysis in each chamber in common, an alkaline water electrolysis method including supplying an electrolyte obtained by dispersing a catalyst containing the NiFe-ns to an anode chamber and a cathode chamber, and performing electrolytic deposition of the NiFe-ns in the electrolytic cell during operation to electrolytically deposit the NiFe-ns on a surface of an electrically conductive substrate having a catalyst layer formed on a surface of an oxygen generation anode, thereby recovering and improving electrolysis performance, and an alkaline water electrolysis anode.

Alkaline water electrolysis method, and anode for alkaline water electrolysis

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.

Water electrolysis system and method of operating water electrolysis system

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&#xb0; C. to not more than 600&#xb0; C., thereby forming a catalyst layer composed of a lithium-containing nickel oxide on the conductive substrate.

Method for producing anode for alkaline water electrolysis, and anode for alkaline water electrolysis

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 layerscomposed 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 substratecomposed of nickel or a nickel-based alloy, and a method for producing the anode for alkaline water electrolysis.

Anode for alkaline water electrolysis and method for producing anode for alkaline water electrolysis

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).

Alkaline storage battery positive electrode, method of fabricating the same, and alkaline storage battery

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.

Electrolytes for redox flow batteries

Growing community of inventors

Akashi, Japan

Ikuo Nagashima