# US 2025/0083134 A1 · Nikel iron-based catalyst doped with metal having electronegativity lower than that of ni and fe, manufacturing method thereof, and alkaline water electrolysis system

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- Number: US 2025/0083134 A1
- Document ID: US20250083134A1
- Status: Published application
- Kind: A1
- Application number: 18/266,678
- Filed: 2023-04-19
- Published: 2025-03-13
- Earliest claimed: 2022-12-29
- Assignees: Postech Research and Business Development Foundation
- Applicants: Postech Research and Business Development Foundation
- Inventors: Yongtae KIM; Byungjo LEE; Sangmun JUNG
- Web page: https://patentgrep.com/patent/US20250083134A1

## CPC

- B01J 23/76: combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/16: Reducing
- C25B 1/04: by electrolysis of water
- C25B 11/031: Porous electrodes
- C25B 11/04: characterised by the material
- C25B 11/052: Electrodes comprising one or more electrocatalytic coatings on a substrate
- C25B 11/061: Metal or alloy
- C25B 11/089: Alloys
- C25B 11/091: consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a Ni—Fe-based catalyst for OER doped with a metal having lower electronegativity than Ni and Fe, and a method for manufacturing the same. More specifically, the present invention offers the advantage of using nickel, a non-noble metal-based active catalyst, which has high economic value without the need for noble metals. The present invention provides a method for manufacturing a Ni—Fe-based catalyst for OER that exhibits excellent activity in oxygen generation reaction by maximizing the surface area compared to existing noble metal-based catalysts, thereby contributing significantly to the cost reduction of hydrogen production.

## Claims

### Claim 1

A doped Ni—Fe-based catalyst for OER, comprising an alloy comprising Fe; Ni; and a metal having electronegativity lower than that of Ni and Fe, wherein the alloy comprises Ni and Fe at a molar ratio of 9:1 to 3:2.

### Claim 2 (depends on 1)

The doped Ni—Fe-based catalyst for OER according to claim 1, wherein the metal having electronegativity lower than that of Ni and Fe comprises Al, Cd, or Zn.

### Claim 3 (depends on 2)

The doped Ni—Fe-based catalyst for OER according to claim 2, wherein the alloy comprises Ni and Fe at a molar ratio of 3:1.

### Claim 4 (depends on 3)

The doped Ni—Fe-based catalyst for OER according to claim 3, wherein the alloy comprises a metal having electronegativity lower than that of Ni and Fe at a molar ratio of 5% to 10%.

### Claim 5 (depends on 4)

The doped Ni—Fe-based catalyst for OER according to claim 4, wherein the alloy comprises a metal having electronegativity lower than that of Ni and Fe at a molar ratio of 5%.

### Claim 6 (depends on 1)

The doped Ni—Fe-based catalyst for OER according to claim 1, wherein the metal having electronegativity lower than that of Ni and Fe comprises Al.

### Claim 7 (depends on 6)

The doped Ni—Fe-based catalyst for OER according to claim 6, wherein the alloy comprises Ni and Fe at a molar ratio of 3:1; and wherein the alloy comprises Al at a molar ratio of 5% to 10%.

### Claim 8 (depends on 6)

The doped Ni—Fe-based catalyst for OER according to claim 6, wherein the alloy comprises Al at a molar ratio of 5%.

### Claim 9 (depends on 1)

An alkaline water electrolysis system comprising end plates, current collectors, bipolar plates, porous transport layers, gaskets, an anode, a separator, and a cathode, wherein the anode comprises the doped Ni—Fe-based catalyst for OER according to claim 1.

### Claim 10

A method for manufacturing a doped Ni—Fe-based catalyst for OER, comprising: material mixing in which powders of NI, Fe, and a metal having electronegativity lower than that of Ni and Fe (e.g., Al, Zn, Cd) are mixed; or a Ni precursor, Fe, and a metal having electronegativity lower than that of Ni and Fe are mixed with a solvent; or Fe and a precursor of a metal having electronegativity lower than that of Ni and F are mixed with a solvent and the resulting mixture is mounted on a Ni support; and
alloying in which a mixed powder of NI, Fe, and a metal having electronegativity lower than that of Ni and Fe; a Ni precursor, Fe, and a metal having electronegativity lower than that of Ni and Fe mixed with a solvent; or Fe and a precursor of a metal having electronegativity lower than that of Ni and F mounted on a Ni support are thermally treated in a reducing gas atmosphere to form an alloy,
wherein Ni and Fe in the alloy is included at a molar ratio of 9:1 to 3:2.

### Claim 11 (depends on 10)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 10, wherein the metal having electronegativity lower than that of Ni and Fe comprises Al, Cd, or Zn.

### Claim 12 (depends on 11)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 11, wherein the alloy comprises Ni and Fe at a molar ratio of 3:1.

### Claim 13 (depends on 12)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 12, wherein the alloy comprises a metal having electronegativity lower than that of Ni and Fe at a molar ratio of 5% to 10%.

### Claim 14 (depends on 13)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 13, wherein the alloy comprises a metal having electronegativity lower than that of Ni and Fe at a molar ratio of 5%.

### Claim 15 (depends on 10)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 10, wherein the metal having electronegativity lower than that of Ni and Fe comprises Al.

### Claim 16 (depends on 15)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 15, wherein the alloy comprises Ni and Fe at a molar ratio of 3:1; and wherein the alloy comprises Al at a molar ratio of 5% to 10%.

### Claim 17 (depends on 16)

The method for manufacturing a doped Ni—Fe-based catalyst for OER according to claim 16, wherein the alloy comprises Al at a molar ratio of 5%.