KR-20260063358-A - WATER ELECTROLYSIS ELECTRODE, MANUFACTURING METHOD OF WATER ELECTROLYSIS ELECTRODE, AND WATER ELECTROLYSIS DEVICE

Abstract

The present disclosure relates to a water electrolysis electrode, a method for manufacturing a water electrolysis electrode, and a water electrolysis apparatus. A water electrolysis electrode according to one embodiment comprises a metal layer; and a catalyst layer formed on the metal layer; wherein the catalyst layer may include silver (Ag), iridium (Ir), and ruthenium (Ru).

Inventors

• 임윤지
• 한현수
• 석태홍
• 이태경

Assignees

• 에스케이이노베이션 주식회사

Dates

Publication Date

20260507

Application Date

20241030

Claims (20)

1. metal layer; and A catalyst layer formed on the metal layer; comprising, The above catalyst layer is, A water electrolysis electrode comprising silver (Ag), iridium (Ir) and ruthenium (Ru).
2. In Article 1, The above metal layer is, A water electrolysis electrode comprising at least one selected from the group consisting of metal mesh, metal foam, metal foil, metal felt, and metal fiber.
3. In Article 1, The above metal layer is, A water electrolysis electrode comprising at least one selected from the group consisting of titanium, nickel, and stainless steel, or an alloy thereof.
4. In Article 1, The above metal layer is, Water electrolysis electrode containing titanium felt.
5. In Article 1, At least some of the silver, iridium, and ruthenium included in the catalyst layer are water electrolysis electrodes that electrically interact with each other.
6. In Article 1, The above catalyst layer is, A first layer comprising the above silver and in contact with the metal layer; and A water electrolysis electrode comprising the above iridium and ruthenium, and a second layer formed on the first layer.
7. In Paragraph 6, At least some of the silver included in the first layer is a water electrolysis electrode that chemically bonds with the metal element of the metal layer.
8. In Article 1, Water electrolysis electrode that does not contain a binder.
9. In Article 1, A water electrolysis electrode comprising the above iridium and ruthenium in a weight ratio of 9:1 to 5:5.
10. In Article 1, A water electrolysis electrode comprising 0.3% to 0.5% by weight based on the total weight of the water electrolysis electrode, wherein the iridium is included.
11. In Article 1, A water electrolysis electrode comprising 0.05% to 0.5% by weight based on the total weight of the water electrolysis electrode.
12. The method includes the step of forming a catalyst layer on a metal substrate; The above catalyst layer is, Method for manufacturing a water electrolysis electrode comprising silver, iridium, and ruthenium.
13. In Paragraph 12, The above metal substrate is, A method for manufacturing a water electrolysis electrode comprising at least one selected from the group consisting of metal mesh, metal foam, metal foil, metal felt, and metal fiber.
14. In Paragraph 12, The above metal substrate is, A method for manufacturing a water electrolysis electrode comprising at least one selected from the group consisting of titanium, nickel, and stainless steel, or an alloy thereof.
15. In Paragraph 12, The step of forming a catalyst layer on the metal substrate is, A step of contacting the metal substrate with a first precursor solution containing silver ions to obtain a metal substrate having a first layer containing silver formed thereon; and A method for manufacturing a water electrolysis electrode comprising the step of contacting a metal substrate having a first layer formed thereon with a second precursor solution containing iridium ions and ruthenium ions to form a second layer containing iridium and ruthenium on the first layer.
16. In Paragraph 15, The step of obtaining a metal substrate having the first layer formed thereon is, A method for manufacturing a water electrolysis electrode comprising the step of heat-treating a metal substrate having the first layer formed thereon.
17. In Paragraph 15, The step of forming the second layer above is, A method for manufacturing a water electrolysis electrode comprising the step of heat-treating a metal substrate having the second layer formed thereon.
18. In Paragraph 12, A method for manufacturing a water electrolysis electrode, further comprising the step of acid-treating the metal substrate prior to the step of forming a catalyst layer on the metal substrate.
19. In Paragraph 15, The above second precursor solution is, A method for manufacturing a water electrolysis electrode comprising the above iridium ions and ruthenium ions in a molar concentration ratio of 9:1 to 5:5.
20. Anode; Cathode; and A membrane located between the anode and cathode; comprising, The above anode is, It includes a metal layer and a catalyst layer formed on the metal layer, and The above catalyst layer is, A water electrolysis device containing silver, iridium, and ruthenium.

Description

Water electrolysis electrode, manufacturing method of water electrolysis electrode, and water electrolysis device The present disclosure relates to a water electrolysis electrode, a method for manufacturing a water electrolysis electrode, and a water electrolysis apparatus. As a clean energy source, hydrogen energy is attracting attention as one of the promising alternative energy sources for solving long-term energy problems. Among hydrogen production methods, water electrolysis—which uses electrical energy to separate water into hydrogen and oxygen, meaning it does not emit carbon dioxide—is receiving significant interest due to its eco-friendliness and can contribute greatly to achieving carbon neutrality. Meanwhile, the water electrolysis reaction includes the oxygen evolution reaction (OER) occurring at the oxygen evolution electrode of the water electrolysis system and the hydrogen evolution reaction occurring at the hydrogen evolution electrode, and the half-cell reaction and the overall reaction in the acidic medium and alkaline medium, respectively, can be represented as shown in Chemical Formulas 1 and 2 below. [Chemical Formula 1] Oxygen evolution reaction: 2H₂O (l) → O₂ (g) + 4H⁺ + 4e⁻ Hydrogen evolution reaction: 4H⁺ + 4e⁻ → 2H₂ (g) Overall reaction: H₂O (l) → H₂ (g) + 1/ 2O₂ (g) [Chemical Formula 2] Oxygen evolution reaction: 2OH⁻ → 1/ 2O₂ (g) + H₂O (l) + 2e⁻ Hydrogen evolution reaction: 2H₂O (l) + 2e⁻ → H₂ (g) + 2OH⁻ Overall reaction: H₂O (l) → H₂ (g) + 1/ 2O₂ (g) Meanwhile, in the above-mentioned water electrolysis reaction, an overpotential higher than the theoretical oxygen generation reaction voltage may occur due to the slower reaction rate of the oxygen generation reaction compared to the hydrogen generation reaction. Therefore, to lower the reaction overpotential and improve oxygen generation performance and efficiency, precious metal-based electrode catalysts such as platinum and iridium, and electrodes applying these catalysts, are mainly used. However, the application of precious metal-based catalysts entails high costs and presents the problem of difficulty in controlling supply. Therefore, there is a need to develop water electrolysis electrodes, specifically oxygen generation electrodes, that can replace precious metal-based catalysts or reduce the precious metal content while simultaneously possessing high oxygen generation reaction performance. FIG. 1 is a drawing showing an example of a cross-section of a water electrolysis electrode according to one embodiment of the present disclosure. FIG. 2 is a drawing showing another example of a cross-section of a water electrolysis electrode according to one embodiment of the present disclosure. FIG. 3 is a step diagram showing an example of a method for manufacturing a water electrolysis electrode according to one embodiment of the present disclosure. Figure 4 is a diagram illustrating an example of step S110 of Figure 3. Figure 5 is a diagram illustrating an example of step S120 of Figure 3. Figure 6 is an SEM/EDS mapping image of the electrode of Example 1. Figure 7 is a graph showing the XRD patterns of the electrodes of Example 1, Comparative Example 2, and Comparative Example 3. Figure 8 is a graph showing the XPS analysis results of the electrodes of Example 1 and Comparative Example 1. Figure 9 is a graph showing the XPS analysis results of the electrodes of Example 1 and Comparative Example 1. Figure 10 is a graph showing the loading amounts of iridium metal and ruthenium metal through ICP mass spectrometry on the catalyst layer of the electrode of Example 1. Figure 11 is a diagram showing an example of a three-electrode system configured for evaluating electrochemical characteristics. FIG. 12 is a graph showing the current density vs. voltage curves by evaluating the oxygen generation performance of each electrode of Examples 1 and 2 and Comparative Examples 1 to 4. Figure 13 is a graph showing the current density vs. voltage curve by evaluating the oxygen generation performance of the electrode of Example 1 by cycle. Since the embodiments described in this specification may be modified in various different forms, the technology according to one embodiment is not limited to the embodiments described below. Furthermore, throughout the specification, the terms "comprising," "having," "containing," or "having" any component do not exclude other components but may include additional components unless specifically stated otherwise, and do not exclude elements, materials, or processes not additionally listed. In this specification, "identical or uniform" may mean that they are identical or uniform to one another within an acceptable margin of error, unless otherwise specified. For example, the statement that certain components or physical property measurements are identical may include not only that the two objects being compared are completely identical, but also that they are identical within a margin of error. Meanwhile, the sta