Anode for electrolysis and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2020385876-A1
Application number	US-201916959584-A
Country	US
Kind code	A1
Filing date	Jun 4, 2019
Priority date	Jun 12, 2018
Publication date	Dec 10, 2020
Grant date	—

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

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; a metal in the composite metal oxide does not comprise palladium; and 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 0.4 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.

8 . A method of preparing the anode of claim 1 , the method comprising:
coating a composition for forming a catalyst layer on at least one surface of a metal base; drying the composition; and heat-treating the composition, wherein: the coating is conducted by electrostatic spray deposition; and the composition for forming a catalyst layer comprises a ruthenium-based compound, an iridium-based compound, a titanium-based compound, and a platinum-based compound.

9 . The method of claim 8 , further comprising performing a pretreatment of the metal base before the composition for forming a catalyst layer is coated,
wherein the pretreatment comprises formation of irregularities on the surface of the metal base by chemical etching, blasting, or thermal spraying.

10 . The method of claim 8 , wherein the composition for forming a catalyst layer further comprises an alcohol-based solvent.

11 . The method of claim 8 , wherein the coating is performed by sequentially repeating coating, drying, and heat-treating so that an amount of ruthenium per unit area (m 2 ) of the metal base is 7.0 g or more.

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

• C25B11/053

  characterised by multilayer electrocatalytic coatings · CPC title

• C25B1/26

  Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34) · CPC title

• B05D3/102

  Pretreatment of metallic substrates (C23C takes precedence) · CPC title

• C25B11/093 Primary

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

• B05D1/04

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