Electrolysis electrode and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2020407860-A1
Application number	US-201916975868-A
Country	US
Kind code	A1
Filing date	Mar 4, 2019
Priority date	Mar 7, 2018
Publication date	Dec 31, 2020
Grant date	—

Abstract

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.

First claim

1 . An electrode for electrolysis comprising:
an electrically conductive substrate at least a surface of which comprises nickel or a nickel-based alloy; an intermediate layer formed on the surface of the electrically conductive substrate and comprising a lithium-containing nickel oxide represented by composition formula Li x Ni 2-x O 2 (0.02≤x≤0.5); and a catalyst layer formed on a surface of the intermediate layer.

2 . The electrode for electrolysis according to claim 1 , wherein the intermediate layer has a layer average density of 5.1 g/cm 3 or more and 6.67 g/cm 3 or less.

3 . The electrode for electrolysis according to claim 1 , wherein the catalyst layer comprises at least one catalyst selected from the group consisting of a nickel cobalt spinel oxide, a lanthanide nickel cobalt perovskite oxide, an iridium oxide, a ruthenium oxide, and a lithium nickel cobalt oxide.

4 . A method for producing an electrode for electrolysis being a method for producing the electrode for electrolysis according to claim 1 , the method comprising:
applying an aqueous solution comprising a lithium ion and a nickel ion on a surface of an electrically conductive substrate at least a surface of which comprises nickel or a nickel-based alloy; heat-treating the electrically conductive substrate having the aqueous solution applied thereon, thereby forming an intermediate layer comprising a lithium-containing nickel oxide represented by composition formula Li x Ni 2-x O 2 (0.02≤x≤0.5) on the surface of the electrically conductive substrate; and forming a catalyst layer on a surface of the formed intermediate layer.

5 . The method for producing an electrode for electrolysis according to claim 4 , wherein the aqueous solution is prepared by dissolving at least one material selected from the group consisting of a nickel carboxylate and a lithium carboxylate in water.

6 . The method for producing an electrode for electrolysis according to claim 4 , further comprising performing a heat treatment at 450° C. or higher and 600° C. or lower after the forming of the catalyst layer.

Assignees

• De Nora Permelec Ltd
• Nat Univ Corp Yokohama Nat Univ
• Kawasaki Heavy Ind Ltd

Inventors

• Mitsushima Shigenori
• Kuroda Yoshiyuki
• Nagashima Ikuo
• Taniguchi Tatsuya
• Nishiki Yoshinori
• Kato Akihiro
• Zaenal Awaludin
• TSUJII Fumiya
• Nakai Takaaki

Classifications

• C25B11/0773

  of the perovskite type · CPC title

• C25B11/0771 Primary

  of the spinel type · CPC title

• C25B11/069

  consisting of at least one single element and at least one compound; consisting of two or more compounds · CPC title

• C25B11/052 Primary

  Electrodes comprising one or more electrocatalytic coatings on a substrate · CPC title

• C25B11/093

  at least one noble metal or noble metal oxide and at least one non-noble metal oxide · CPC title