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DE-102025127936-A1 - CATALYST FOR OXYGEN ENGINEERING REACTION WITH A MIXTURE AND METHOD FOR MAKING THE SAME

DE102025127936A1DE 102025127936 A1DE102025127936 A1DE 102025127936A1DE-102025127936-A1

Abstract

A catalyst can have a network structure for an oxygen evolution reaction based on a metal oxide on its surface. The catalyst can include a metal catalyst comprising a central part and a surface part surrounding the central part. The surface part can include a framework with a network structure and a metal oxide deposited on the framework.

Inventors

  • Dae Yong Son
  • Jong Kil Oh
  • Je Min Kim
  • Kwang Yeol Lee
  • Ye Ji PARK
  • Do Yeop KIM
  • Min Seon Cha

Assignees

  • HYUNDAI MOTOR COMPANY
  • KIA CORPORATION
  • KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION

Dates

Publication Date
20260513
Application Date
20250716
Priority Date
20241111

Claims (20)

  1. Catalyst for an oxygen evolution reaction, wherein the catalyst comprises: a metal catalyst comprising a central part (10) and a surface part (20) surrounding the central part (10), the surface part (20) comprising: a framework with a network structure and a metal oxide deposited on the framework.
  2. catalyst after Claim 1 , further comprising a support, wherein the metal catalyst is supported on the support.
  3. catalyst after Claim 1 or 2 , wherein the metal catalyst has a diameter in the range of 30 nm to 100 nm.
  4. catalyst after one of the Claims 1 until 3 , wherein the surface part (20) has a thickness in the range of 2 nm to 10 nm.
  5. catalyst after one of the Claims 1 until 4 , wherein the framework comprises an alloy of a platinum group element and a transition metal.
  6. catalyst after Claim 5 , wherein the platinum group element comprises at least one of platinum (Pt), palladium (Pd) or rhodium (Rh).
  7. catalyst after Claim 5 or 6 , excluding the platinum group element iridium (Ir).
  8. catalyst after one of the Claims 5 until 7 , wherein the transition metal comprises at least one of nickel (Ni), cobalt (Co), copper (Cu) or iron (Fe).
  9. catalyst after one of the Claims 1 until 8 , wherein the metal oxide is coated on the framework with a thickness in the range of 2 nm to 5 nm.
  10. catalyst after one of the Claims 1 until 9 , wherein the metal oxide is coated on a surface of the central part (10).
  11. catalyst after one of the Claims 1 until 10 , wherein the metal oxide comprises ruthenium oxide (RuO 2 ) with a rutile structure.
  12. catalyst after one of the Claims 1 until 11 , wherein the metal oxide is absent in a region extending to a depth of 5 nm from a surface of the metal catalyst.
  13. A process for producing a catalyst for an oxygen evolution reaction, comprising: producing a particle comprising an alloy of a platinum group element and a transition metal, producing a metal catalyst precursor by coating the particle with a metal oxide precursor, and producing a catalyst by oxidizing the metal catalyst precursor, the catalyst comprising a metal catalyst having a central part (10) and a surface part (20) surrounding the central part (10), and the surface part (20) comprising a framework (21) having a network structure and a metal oxide deposited on the framework (21).
  14. Procedure according to Claim 13 , wherein the production of the particle comprises: producing a particle precursor comprising the alloy of the platinum group element and the transition metal by reacting a platinum group element precursor and a transition metal precursor, and producing the particle by treating the particle precursor with acid, wherein the particle comprises an acid-etched surface.
  15. Procedure according to Claim 13 or 14 , wherein the platinum group element comprises at least one of platinum (Pt), palladium (Pd) or rhodium (Rh), excludes the platinum group element iridium (Ir) and the transition metal comprises at least one of nickel (Ni), cobalt (Co), copper (Cu) or iron (Fe).
  16. Procedure according to one of the Claims 13 until 15 , wherein the production of the metal catalyst precursor comprises the reaction of the particle with the metal oxide precursor in a carbon monoxide atmosphere.
  17. Procedure according to one of the Claims 13 until 16 , wherein the production of the catalyst comprises the oxidation of the metal oxide precursor to a metal oxide by heat-treating the metal catalyst precursor at a temperature in the range of 250°C to 350°C in an oxygen atmosphere.
  18. Procedure according to one of the Claims 13 until 17 , wherein the metal oxide is coated on the framework (21) with a thickness in a range of 2 nm to 5 nm and the metal oxide is coated on a surface of the middle part (10).
  19. Procedure according to one of the Claims 13 until 18 , wherein the metal oxide comprises ruthenium oxide (RuO 2 ) with a rutile structure.
  20. Procedure according to one of the Claims 13 until 19 , wherein the metal oxide is absent in a region extending to a depth of 5 nm from a surface of the metal catalyst.

Description

TECHNICAL AREA The present disclosure relates to a catalyst having a network structure on its surface and a method for producing the same. BACKGROUND With rising global energy demand, climate change caused by the use of fossil fuels has become more severe. Hydrogen, which can be produced and stored sustainably and in an environmentally friendly way, is the most promising alternative energy source to address this problem. However, water electrolysis technology, a key application in hydrogen production, faces numerous challenges in verification and commercialization. An oxygen evolution reaction (OER), which occurs at a negative electrode during a water electrolysis reaction, involves many electron movements and has a slow reaction rate. To compensate for these shortcomings and maximize the performance of water electrolysis devices, it is essential to develop catalysts with high performance and long durability. The operating environment of polymer electrolyte membrane water electrolysis (PEMWE) is acidic. Therefore, for actual commercial applications, a highly stable catalyst that can maintain its structure even under acidic conditions is essential. Currently, catalysts based on precious metal materials such as iridium (Ir) exhibit excellent activity and stability in an oxygen evolution reaction; however, such catalysts have significant problems regarding price competitiveness. The explanations in this background section merely provide background information related to the present disclosure and do not constitute prior art. SUMMARY OF THE REVELATION In light of the above, to improve the performance of the overall water electrolysis reaction, it is desirable to develop a cost-effective, high-performance, and durable catalyst capable of promoting an oxygen evolution reaction taking place at a negative electrode. Several aspects involve providing a non-iridium-based (Ir-free) catalyst for an oxygen evolution reaction and a method for producing it. Several aspects involve providing an efficient and highly stable catalyst for an oxygen evolution reaction and a method for producing it. Several aspects are not limited to the purposes mentioned above. Various aspects will become clearer from the following description and can be realized through means and combinations thereof, as set out in the claims. Depending on various aspects, a catalyst for an oxygen evolution reaction can include a metal catalyst comprising a central part and a surface part surrounding the central part. The surface part can include a framework with a network structure and a metal oxide deposited on the framework by means of a coating. The catalyst may also include a support, and the metal catalyst may be supported on the support. The metal catalyst can have a diameter in the range of 30 nm to 100 nm. The surface portion can have a thickness in the range of 2 nm to 10 nm. The framework can enclose an alloy of a platinum group element and a transition metal. The platinum group element can include at least one of platinum (Pt), palladium (Pd) or rhodium (Rh). The platinum group element can exclude iridium (Ir). The transition metal can include at least one of nickel (Ni), cobalt (Co), copper (Cu) or iron (Fe). The metal oxide can be applied to the framework by means of a coating with a thickness in the range of 2 nm to 5 nm. The metal oxide can also be applied to a surface of the middle part by means of a coating. The metal oxide can include ruthenium oxide (RuO 2 ) with a rutile structure. The metal oxide may be absent in a space (e.g., a region of the metal catalyst) extending to a depth of 5 nm from the surface of the metal catalyst. Depending on various aspects, a process for producing a catalyst for an oxygen evolution reaction may include: producing a particle containing an alloy of a platinum group element and a transition metal, producing a metal catalyst precursor by coating the particle with a metal oxide precursor, and producing a catalyst by oxidizing the metal catalyst precursor. The production of the particle may include: producing a particle precursor containing the alloy of the platinum group element and the transition metal by reacting the platinum group element precursor and the transition metal precursor, and producing the particle by treating the particle precursor with acid. The particle may include an acid-etched surface. The production of the metal catalyst precursor can involve the reaction of the particle with the metal oxide precursor in a carbon monoxide atmosphere. The production of the catalyst can include the oxidation of the metal oxide precursor to a metal oxide by heat-treating the metal catalyst precursor at a temperature in the range of 250°C to 350°C in an oxygen atmosphere. According to various aspects, a non-iridium-based (Ir-free) catalyst for an oxygen evolution reaction and a method for its preparation can be obtained. According to various aspects, an efficient and highly stable catalyst for an oxygen evolu