CN-122013230-A - Catalyst with reticular structure for oxygen evolution reaction and preparation method thereof

Abstract

A catalyst which may have a network structure on its surface for oxygen evolution reactions based on metal oxides. The catalyst may include a metal catalyst including a central portion and a surface portion surrounding the central portion. The surface portion may include a frame having a mesh structure, and a metal oxide applied to the frame.

Inventors

• SUN DAYONG
• WU ZONGJI
• Jin Dimin
• LI GUANGLIE
• Pu Ruizhi
• Jin Duye
• Che Minxian

Assignees

• 现代自动车株式会社
• 起亚株式会社
• 高丽大学校产学协力团

Dates

Publication Date

20260512

Application Date

20250716

Priority Date

20241111

Claims (20)

1. 1. A catalyst for an oxygen evolution reaction, the catalyst comprising: a metal catalyst comprising a central portion and a surface portion surrounding the central portion, Wherein the surface portion comprises: A frame having a mesh structure, and A metal oxide applied to the frame.
2. 2. The catalyst according to claim 1, further comprising a carrier, Wherein the metal catalyst is supported on the carrier.
3. 3. The catalyst of claim 1, wherein the diameter of the metal catalyst is in the range of 30nm to 100 nm.
4. 4. The catalyst of claim 1, wherein the surface portion has a thickness in the range of 2nm to 10 nm.
5. 5. The catalyst of claim 1, wherein the framework comprises an alloy of a platinum group element and a transition metal.
6. 6. The catalyst of claim 5, wherein the platinum group element comprises at least one of platinum (Pt), palladium (Pd), or rhodium (Rh).
7. 7. The catalyst of claim 5, wherein the platinum group element does not include iridium (Ir).
8. 8. The catalyst of claim 5, wherein the transition metal comprises at least one of nickel (Ni), cobalt (Co), copper (Cu), or iron (Fe).
9. 9. The catalyst of claim 1, wherein the metal oxide is coated on the frame with a thickness in the range of 2nm to 5 nm.
10. 10. The catalyst of claim 1, wherein the metal oxide is coated on a surface of the central portion.
11. 11. The catalyst of claim 1, wherein the metal oxide comprises ruthenium oxide (RuO 2 ) having a rutile structure.
12. 12. The catalyst of claim 1, wherein the metal oxide is absent in a region extending to a depth of 5nm from a surface of the metal catalyst.
13. 13. A method for preparing a catalyst for an oxygen evolution reaction, the method comprising: preparing particles of an alloy comprising a platinum group element and a transition metal; preparing a metal catalyst precursor by coating the particles with a metal oxide precursor, and Preparing a catalyst by oxidizing the metal catalyst precursor, Wherein the catalyst comprises a metal catalyst comprising a central portion and a surface portion surrounding the central portion, and Wherein the surface portion comprises A frame having a mesh structure, and A metal oxide applied to the frame.
14. 14. The method of claim 13, wherein preparing the particles comprises: Preparing a particle precursor including an alloy of a platinum group element and a transition metal by reacting the platinum group element precursor and the transition metal precursor, and The particles are prepared by treating the particle precursor with an acid, Wherein the particles comprise a surface etched by the acid.
15. 15. The method according to claim 13, wherein: the platinum group element includes at least one of platinum (Pt), palladium (Pd) or rhodium (Rh), The platinum group element does not include iridium (Ir), and The transition metal includes at least one of nickel (Ni), cobalt (Co), copper (Cu), or iron (Fe).
16. 16. The method of claim 13, wherein preparing the metal catalyst precursor comprises reacting the particles with the metal oxide precursor in a carbon monoxide atmosphere.
17. 17. The method of claim 13, wherein preparing the catalyst comprises oxidizing the metal oxide precursor to a metal oxide by heat treating the metal catalyst precursor in an oxygen atmosphere at a temperature in the range of 250 ℃ to 350 ℃.
18. 18. The method of claim 13, wherein the metal oxide is coated on the frame to a thickness in the range of 2nm to 5nm, and The metal oxide is coated on the surface of the central portion.
19. 19. The method of claim 13, wherein the metal oxide comprises ruthenium oxide (RuO 2 ) having a rutile structure.
20. 20. The method of claim 13, wherein the metal oxide is absent in a region extending to a depth of 5nm from a surface of the metal catalyst.

Description

Catalyst with reticular structure for oxygen evolution reaction and preparation method thereof Technical Field The present invention relates to a catalyst having a network structure on its surface and a method for preparing the same. Background With the increasing global energy demand, climate change from fossil fuel use is becoming increasingly severe. As an alternative energy source to solve this problem, hydrogen is the most promising fuel candidate because it can be continuously and environmentally friendly produced and stored. However, the water electrolysis technology, which is one of the important tasks of hydrogen production, faces many difficulties in verification and commercialization. During the water electrolysis reaction, the Oxygen Evolution Reaction (OER) of the negative electrode (negative electrode) involves a number of electron movements (electron movement) and the reaction rate is slow. To compensate for these drawbacks and maximize the performance of the water electrolysis device, it is important to develop a high performance, high durability catalyst. The operating environment for Polymer Electrolyte Membrane Water Electrolysis (PEMWE) is acidic. Therefore, for practical industrial applications, a highly stable catalyst that maintains its structure even under acidic conditions is indispensable. Currently, catalysts based on noble metal materials such as iridium (Ir) show excellent activity and stability in oxygen evolution reactions, but such catalysts have a significant problem in terms of price competitiveness. The statements in this background section merely provide background information related to the present disclosure and may not constitute prior art. Disclosure of Invention In view of the above, in order to improve the performance of the entire water electrolysis reaction, it is required to develop a catalyst which is high in performance, high in durability and inexpensive and is capable of promoting the oxygen evolution reaction occurring at the anode. Various aspects of the present invention provide a non-iridium (iridium-free) -based catalyst for oxygen evolution reaction and a method of preparing the same. Various aspects of the present invention provide a highly efficient and highly stable catalyst for oxygen evolution reactions and a method of preparing the same. The various aspects of the present invention are not limited to the above-described objects. Various aspects of the invention will become more fully apparent from the following description, and may be practiced by the versions and combinations set forth in the claims. According to various aspects of the present invention, the catalyst for the oxygen evolution reaction may include a metal catalyst including a central portion and a surface portion surrounding the central portion. The surface portion may include a frame having a mesh structure and a metal oxide applied to the frame by coating. The catalyst may further comprise a support, and the metal catalyst may be supported on the support. The diameter of the metal catalyst may be in the range of 30nm to 100 nm. The thickness of the surface portion may be in the range of 2nm to 10 nm. The frame may comprise an alloy of a platinum group element and a transition metal. The platinum group element may include at least one of platinum (Pt), palladium (Pd), or rhodium (Rh). The platinum group element may not include iridium (Ir). The transition metal may include at least one of nickel (Ni), cobalt (Co), copper (Cu), or iron (Fe). The metal oxide may be applied to the frame by coating at a thickness in the range of 2nm to 5 nm. The metal oxide may also be applied to the surface of the central portion by coating. The metal oxide may include ruthenium oxide (RuO 2) having a rutile structure. The metal oxide may not be present in the space extending from the surface of the metal catalyst to a depth of 5nm (e.g., the region of the metal catalyst). According to various aspects, a method for preparing a catalyst for an oxygen evolution reaction may include preparing particles of an alloy containing a platinum group element and a transition metal, preparing a metal catalyst precursor by coating the particles with a metal oxide precursor, and preparing the catalyst by oxidizing the metal catalyst precursor. Preparing the particles may include preparing a particle precursor containing a platinum group element and a transition metal alloy by reacting the platinum group element precursor and the transition metal precursor, and preparing the particles by treating the particle precursor with an acid. The particles may include a surface that is acid etched. Preparing the metal catalyst precursor may include reacting the particles with the metal oxide precursor in a carbon monoxide atmosphere. Preparing the catalyst may include oxidizing the metal oxide precursor to the metal oxide by heat treating the metal catalyst precursor in an oxygen atmosphere at a temperature in the range of 25