Electrode for electrolysis and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2019211464-A1
Application number	US-201816328224-A
Country	US
Kind code	A1
Filing date	Jul 30, 2018
Priority date	Aug 11, 2017
Publication date	Jul 11, 2019
Grant date	—

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

1 . An electrode for electrolysis, comprising:
a metal substrate; and a catalyst layer formed on the metal substrate, wherein: the catalyst layer comprises nitrogen, a platinum group metal, and a rare earth metal, and a nitrogen content of the catalyst layer is 20 to 60 mol % based on the mol % of the platinum group metal.

2 . The electrode for electrolysis of claim 1 , wherein the catalyst layer comprises a needle-like structure of the rare earth metal.

3 . The electrode for electrolysis of claim 2 , wherein the needle-like structure comprises at least two needle-shaped structures each separately having a thickness of 50 to 300 nm and a length of 0.5 to 10 μm.

4 . A preparation method of an electrode for electrolysis, comprising the steps of:
preparing a coating solution for preparing an electrode, the coating solution containing a platinum group metal precursor, a rare earth metal precursor, an organic solvent, and an amine-based solvent; applying the coating solution on a metal substrate to form a catalyst layer; drying the catalyst layer; and heat-treating the catalyst layer.

5 . The preparation method of an electrode for electrolysis of claim 4 , 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 ).

6 . The preparation method of an electrode for electrolysis of claim 4 , 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 ).

7 . The preparation method of an electrode for electrolysis of claim 4 , wherein the organic solvent is a mixed solvent of a C1 to C6 alcohol and a C4 to C8 glycol ether.

8 . The preparation method of an electrode for electrolysis of claim 7 , wherein the ratio of the C1 to C6 alcohol to the C4 to C8 glycol ether in the mixed solvent is 10:1 to 1:2.

9 . The preparation method of an electrode for electrolysis of claim 4 , wherein the amine-based solvent is a C6 to C30 saturated or unsaturated aliphatic amine.

10 . The preparation method of an electrode for electrolysis of claim 4 , wherein the amine-based solvent is at least one selected from the group consisting of octylamine, decylamine, dodecylamine, oleylamine, laurylamine, and hexadecylamine.

11 . The preparation method of an electrode for electrolysis of claim 4 , wherein the platinum group metal precursor and the rare earth metal precursor are present in a molar ratio of 1:1 to 10:1.

12 . The preparation method of an electrode for electrolysis of claim 4 , wherein the amine-based solvent is present in an amount of 3 to 40 vol % based on 100 vol % of the coating solution.

13 . The preparation method of an electrode for electrolysis of claim 4 , 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.

14 . The preparation method of an electrode for electrolysis of claim 4 , wherein the drying step is carried out at a temperature of 70 to 200° C.

15 . The preparation method of an electrode for electrolysis of claim 4 , wherein the heat-treating step is carried out at a temperature of 300 to 600° C.

16 . An electrode for electrolysis prepared by the method of claim 4 .

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• C25B1/34

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

• C25B1/46

  in diaphragm cells · CPC title

• C25B11/02 Primary

  characterised by shape or form · CPC title

• C25B11/0431

  Chemistry & Metallurgy · mapped topic

• C25B11/0489 Primary

  Chemistry & Metallurgy · mapped topic