Electrode for electrolysis and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11396709-B2
Application number	US-201816328224-A
Country	US
Kind code	B2
Filing date	Jul 30, 2018
Priority date	Aug 11, 2017
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

Provided is an electrode for electrolysis and a preparation method of the same. The electrode for electrolysis has an improved needle-like structure of a rare earth metal compared to conventional electrodes, and thus detachment of catalytic materials is reduced, so that the electrode is excellent in durability such as exhibiting stable performance even in a reverse current flow. Further, since the electrode for electrolysis has a low overvoltage value, an overvoltage required amount of the electrolytic cell can be remarkably reduced. In addition, an electrode for electrolysis having the above effect can be prepared without introducing additional precursors or changing manufacturing facilities.

First claim

The invention claimed is:

1. A preparation method of an electrode for electrolysis, comprising the steps of:
preparing a coating solution for preparing an electrode by:
dissolving a platinum group metal precursor and a rare earth metal precursor in an organic solvent that is a mixed solvent comprising a C1 to C6 alcohol and a C5 to C8 glycol ether in a volume ratio of from 2:1 to 1:1 to yield a precursor solution;
mixing the precursor solution and an amine-based solvent comprising a C6 to C30 unsaturated aliphatic amine to yield the coating solution;

applying the coating solution on a metal substrate to form a catalyst layer;
drying the catalyst layer; and
heat-treating the catalyst layer,
wherein the catalyst layer comprises a needle-like structure of the rare earth element.

2. The method of claim 1 , wherein the platinum group metal precursor is at least one selected from the group consisting of ruthenium chloride hydrate (RuCl 3 .nH 2 O), tetraamine platinum(II) chloride hydrate (Pt(NH 3 ) 4 Cl 2 .H 2 O), rhodium chloride (RhCl 3 ), rhodium nitrate hydrate (Rh(NO 3 ) 3 .nH 2 O), iridium chloride hydrate (IrCl 3 . nH 2 O), and palladium nitrate (Pd(NO 3 ) 2 ).

3. The method of claim 1 , wherein the rare earth metal precursor is at least one selected from the group consisting of cerium(III) nitrate (Ce(NO 3 ) 3 ), cerium(III) carbonate (Ce 2 (CO 3 ) 3 ), cerium(III) chloride (CeCl 3 ), yttrium oxide (Y 2 O 3 ), and yttrium carbonate (Y 2 (CO 3 ) 3 ).

4. The method of claim 1 , wherein the amine-based solvent is oleylamine.

5. The method of claim 1 , wherein the platinum group metal precursor and the rare earth metal precursor are present in a molar ratio of 1:1 to 10:1.

6. The method of claim 1 , wherein the amine-based solvent is present in an amount of 3 to 40 vol % based on 100 vol % of the coating solution.

7. The method of claim 1 , wherein a total concentration of the platinum group metal precursor and the rare earth metal precursor in the coating solution is 50 to 150 g/L.

8. The method of claim 1 , wherein the drying step is carried out at a temperature of 70 to 200° C.

9. The method of claim 1 , wherein the heat-treating step is carried out at a temperature of 300 to 600° C.

10. The method of claim 1 , wherein the drying step is carried out at a temperature of 200° C. for 5 to 15 minutes.

11. The method of claim 1 , wherein:
the platinum group metal precursor that is at least one selected from the group consisting of ruthenium chloride hydrate (RuCl 3 .nH 2 O), rhodium chloride (RhCl 3 ), rhodium nitrate hydrate (Rh(NO 3 ) 3 .nH 2 O), iridium chloride hydrate (IrCl 3 .nH 2 O), and palladium nitrate (Pd(NO 3 ) 2 );
the rare earth metal precursor is at least one selected from the group consisting of cerium(III) nitrate (Ce(NO 3 ) 3 ), cerium(III) carbonate (Ce 2 (CO 3 ) 3 ), cerium(III) chloride (CeCl 3 ), yttrium oxide (Y 2 O 3 ), and yttrium carbonate (Y 2 (CO 3 ) 3 ); and
the platinum group metal precursor and the rare earth metal precursor are present in a molar ratio of 3:1 to 10:1.

Assignees

• Lg Chemical Ltd

Inventors

• Jung Jongwook
• Hwang Gyo Hyun
• Bang Jungup
• Bang Yongju
• Lee Dongchul
• Kim Yeonyi
• Eom Heejun
• Kim Myunghun

Classifications

• C25B11/02 Primary

  characterised by shape or form · CPC title

• C23C18/08

  characterised by the deposition of metallic material · CPC title

• C25B1/46

  in diaphragm cells · CPC title

• C25B11/057

  consisting of a single element or compound · CPC title

• C25B11/095 Primary

  at least one of the compounds being organic · CPC title