Hypochlorous acid generating electrode

Patent metadata

Field	Value
Publication number	US-12188136-B2
Application number	US-202318119993-A
Country	US
Kind code	B2
Filing date	Mar 10, 2023
Priority date	Mar 31, 2022
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

Disclosed is a hypochlorous acid generating electrode that is substantially free from rhodium, which is comparable in performance to a rhodium-containing electrode and is more durable than the rhodium-containing electrode. The electrode to be used for generating hypochlorous acid by electrolyzing water that contains a chloride ion has excellent hypochlorous acid water generation ability and durability, in which the electrode has an electrode substrate comprising titanium or titanium alloy, and a composite layer that is electrically connected with the electrode substrate and that contains iridium or a compound thereof, tantalum or a compound thereof, and ruthenium or a compound thereof and/or platinum, and does not contain rhodium oxide.

First claim

What is claimed is:

1. An electrode to be used for generating hypochlorous acid by electrolyzing water that contains a chloride ion, comprising:
an electrode substrate comprising titanium or titanium alloy,
a composite layer that is electrically connected with the electrode substrate, and
a thin intermediate layer comprising titanium oxide on a surface of the substrate;
wherein the composite layer comprises iridium or a compound thereof, tantalum or a compound thereof, and ruthenium or a compound thereof and/or platinum, and does not contain rhodium oxide; and
wherein the composite layer contains, in terms of metal, iridium in the range of 32 to 43 mol %, tantalum in the range of 25 to 36 mol %, ruthenium in the range of 8 to 22 mol %, and platinum in the range of 10 to 23 mol %.

2. The electrode according to claim 1 , wherein the composite layer comprises iridium oxide, tantalum oxide, ruthenium oxide, and platinum.

3. The electrode according to claim 1 , wherein the composite layer contains the ruthenium in the range of 11 to 19 mol % and the platinum in the range of 13 to 20 mol %.

4. The electrode according to claim 3 , wherein a total of the ruthenium and the platinum, in terms of metal, is in the range of 24 to 39 mol %.

5. The electrode according to claim 1 , wherein the water that contains a chloride ion is tap water or well water.

6. A hypochlorous acid water generating apparatus comprising the electrode according to claim 1 .

7. A toilet apparatus comprising a hypochlorous acid water generating device that comprises the electrode according to claim 1 .

8. A method for producing hypochlorous acid water, comprising the steps of:
providing the electrode according to claim 1 , and
contacting the electrode with water that contains a chloride ion.

Assignees

• Toto Ltd

Inventors

• Sakai Sena
• Tashiro Keisuke
• Matsumoto Satoru
• Amemori Hiroaki

Classifications

• C25B1/22

  Inorganic acids · CPC title

• C25B11/063

  Valve metal, e.g. titanium · CPC title

• C25B9/17

  Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof · CPC title

• C02F1/46109

  Electrodes · CPC title

• C02F2001/46142

  Catalytic coating · CPC title