Electrolysis electrode and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11866834-B2
Application number	US-201916975868-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	Mar 7, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

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 Li x Ni 2-x O 2 (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

The invention claimed is:

1. An anode of an electrolysis cell 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 , wherein x is in a range from 0.3 to 0.5; and
a catalyst layer formed on a surface of the intermediate layer,
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, and a lithium nickel cobalt oxide,
wherein the intermediate layer has a layer average density in a range from 5.1 g/cm 3 to 6.0 g/cm 3 , and
wherein the intermediate layer is a layer formed by heat-treating a precursor thereof at a temperature in a range from 450° C. to 600° C. on the surface of the electrically conductive substrate.

2. A method for producing the anode of an electrolysis cell according to claim 1 , the method comprising:
applying an aqueous solution comprising a lithium ion and a nickel ion on the surface of the electrically conductive substrate at least a surface of which comprises nickel or a nickel-based alloy;
the heat-treating the electrically conductive substrate having the aqueous solution applied thereon at a temperature in a range from 450° C. to 600° C., thereby forming the intermediate layer comprising a lithium-containing nickel oxide represented by composition formula Li x Ni 2-x O 2 , wherein x is in a range from 0.02 0.3 to 0.5, on the surface of the electrically conductive substrate, so that the intermediate layer having a layer average density in a range from 5.1 g/cm 3 to 6.0 g/cm 3 is formed; and
forming the catalyst layer on the surface of the formed intermediate layer.

3. The method for producing the anode of an electrolysis cell according to claim 1 , wherein the aqueous solution is prepared by dissolving in water, at least one material selected from the group consisting of a nickel carboxylate and a lithium carboxylate.

4. The method for producing the anode of an electrolysis cell according to claim 2 , further comprising performing a heat treatment at a temperature in a range from 450° C. to 600° C. after the forming of the catalyst layer.

5. The anode of an electrolysis cell according to claim 1 , wherein the catalyst layer is a laminate of a plurality of catalyst layers, wherein each of the plurality of catalyst layers comprises the at least one catalyst different from each other.

6. The anode of an electrolysis cell according to claim 1 , wherein the catalyst layer comprises:
a first catalyst layer formed on the surface of the intermediate layer; and
a second catalyst layer formed on the first catalyst layer,
wherein the first catalyst layer comprises the at least one catalyst different from the at least one catalyst in the second catalyst layer.

Assignees

• De Nora Permelec Ltd
• Kawasaki Heavy Ind Ltd

Inventors

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

Classifications

• C25B11/0771 Primary

  of the spinel type · CPC title

• C23C18/1216

  Metal oxides (C23C18/1212 takes precedence) · CPC title

• C25B11/0773

  of the perovskite type · CPC title

• C25B11/052 Primary

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

• Y02P20/133

  Renewable energy sources, e.g. sunlight · CPC title