Reduction electrode for electrolysis and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2021140058-A1
Application number	US-201917052150-A
Country	US
Kind code	A1
Filing date	Jul 3, 2019
Priority date	Jul 6, 2018
Publication date	May 13, 2021
Grant date	—

Abstract

Provided is a reduction electrode for electrolysis and a manufacturing method thereof, the reduction electrode including a metal substrate and an active layer positioned on at least one surface of the metal substrate, wherein the active layer includes ruthenium oxide, a platinum oxide, and a cerium oxide. When the active layer is uniformly divided into a plurality of pixels, the standard deviation of the composition of ruthenium between the plurality of pixels formed by uniformly dividing the active layer is 0.4 or less, and N atoms in the active layer are present in an amount of 20-60 mol % based on ruthenium.

First claim

1 . A reduction electrode for electrolysis comprising a metal substrate and an active layer positioned on at least one surface of the metal substrate, wherein:
the active layer includes a ruthenium oxide, a platinum oxide, and a cerium oxide; when the active layer is uniformly divided into a plurality of pixels, the standard deviation of the composition of ruthenium between the plurality of pixels uniformly divided is 0.4 or less; and N atoms in the active layer are present in an amount of 20-60 mol % based on ruthenium.

2 . The reduction electrode for electrolysis of claim 1 , wherein the standard deviation of the composition of ruthenium is 0.35 or less.

3 . The reduction electrode for electrolysis of claim 1 , wherein the active layer comprises, based on 100 mol % in total of metal components in the active layer, the ruthenium in an amount of 3-7 mol %.

4 . The reduction electrode for electrolysis of claim 1 , wherein the active layer comprises cerium and ruthenium in a molar ratio of 1:1 to 1:1.5.

5 . The reduction electrode for electrolysis of claim 1 , further comprising a hydrogen adsorption layer positioned on the active layer and including one or more selected from the group consisting of a tantalum oxide, a nickel oxide, and carbon.

6 . A method for manufacturing the reduction electrode for electrolysis of claim 1 , the method comprising:
a coating step of applying, drying, and heat treating an active layer composition for a reduction electrode on at least one surface of a metal substrate, wherein: the applying is performed by an electrostatic spray deposition method; and the active layer composition for a reduction electrode includes a metal precursor mixture containing a ruthenium-based compound, a platinum-based compound, a cerium-based compound, and an organic solvent containing an alcohol-based compound and an amine-based compound.

7 . The method of claim 6 , wherein the metal precursor mixture comprises, based on 1 mole of the ruthenium-based compound, the platinum-based compound in an amount of 0.01-0.7 mole and the cerium-based compound in an amount of 0.01-0.5 mole.

8 . The method of claim 6 , wherein the amine-based compound is one or more selected from the group consisting of n-octylamine, t-octylamine, isooctylamine, trioctylamine, oleylamine, tributylamine, and cetyltrimethylammonium bromide.

9 . The method of claim 6 , wherein the alcohol-based compound comprises one or more selected from the group consisting of a primary alkyl alcohol having an alkyl group of 1 to 4 carbon atoms, and an alkoxyalkyl alcohol having an alkyl group of 1 to 4 carbon atoms to which an alkoxy group of 1 to 4 carbon atoms is coupled as a substituent.

10 . The method of claim 6 , wherein the alcohol-based compound comprises:
a primary alkyl alcohol having an alkyl group having 1 to 4 carbon atoms; and an alkoxyalkyl alcohol having an alkyl group of 1 to 4 carbon atoms to which an alkoxy group of 1 to 4 carbon atoms is coupled as a substituent.

11 . The method of claim 6 , further comprising a step of preparing a hydrogen adsorption layer after the coating step.

Assignees

• Lg Chemical Ltd

Inventors

• Eom Hee Jun
• Kim Yeon Yi
• Kim Myung Hun
• Lee Dong Chul
• Jung Sang Yun
• Hwang Gyo Hyun
• Jung Jong Wook
• Bang Yong Ju

Classifications

• C25B11/061

  Metal or alloy · CPC title

• C23C18/1295

  with after-treatment of the deposited inorganic material · CPC title

• C25B11/053

  characterised by multilayer electrocatalytic coatings · CPC title

• C23C18/1216

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

• B05D3/0272

  with ovens · CPC title