Anode for electrolysis and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11499239-B2
Application number	US-201916959584-A
Country	US
Kind code	B2
Filing date	Jun 4, 2019
Priority date	Jun 12, 2018
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

Provided are an anode for electrolysis, which includes a metal base, and a catalyst layer disposed on at least one surface of the metal base, wherein the catalyst layer includes a composite metal oxide of ruthenium, iridium, titanium, and platinum, and a metal in the composite metal oxide does not include palladium, wherein, when the catalyst layer is equally divided into a plurality of pixels, a standard deviation of iridium compositions of the plurality of equally divided pixels is 0.40 or less, and a method of preparing the same.

First claim

The invention claimed is:

1. An anode for electrolysis, the anode comprising:
a metal base; and
a catalyst layer disposed on at least one surface of the metal base,
wherein:
the catalyst layer comprises a composite metal oxide of ruthenium, iridium, titanium, and platinum;
the catalyst layer does not include palladium as a metal component;
the anode does not include palladium; and
a standard deviation of iridium compositions of a plurality of equally divided pixels of the catalyst layer is 0.4 or less.

2. The anode of claim 1 , wherein the standard deviation of iridium compositions is 0.30 or less.

3. The anode of claim 1 , wherein a standard deviation value of the iridium compositions with respect to a mean value of the iridium compositions of the plurality of divided pixels (standard deviation/mean) is in a range of 0.05 to 0.15.

4. The anode of claim 1 , wherein the catalyst layer comprises 7.0 g or more of ruthenium per unit area (m 2 ) of the catalyst layer.

5. The anode of claim 1 , wherein the composite metal oxide comprises a total amount of the ruthenium, the iridium, and the titanium to the amount of platinum in a molar ratio of 98:2 to 80:20.

6. The anode of claim 1 , wherein the composite metal oxide comprises:
20 mol % to 35 mol % of the ruthenium;
10 mol % to 25 mol % of the iridium;
35 mol % to 60 mol % of the titanium; and
2 mol % to 20 mol % of the platinum, based on a total mole of metal components in the composite metal oxide.

7. The anode of claim 1 , wherein the metal base comprises titanium, tantalum, aluminum, hafnium, nickel, zirconium, molybdenum, tungsten, stainless steel, or an alloy thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Park Hun Min
• Choi Jung Ho
• Hwang In Sung
• Kim Kwang Hyun
• Bang Jung Up
• Lee Dong Chul
• Hwang Gyo Hyun

Classifications

• B05D1/04

  involving the use of an electrostatic field {(B05D1/025 and B05D1/14 take precedence)} · CPC title

• B05D3/002

  Pretreatement · CPC title

• B05D3/10

  by other chemical means · CPC title

• C25B1/34 Primary

  Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis · CPC title

• B05D3/00

  Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials (successively applying liquids or other fluent materials B05D1/36; drying ovens F26B) · CPC title