Manufacturing method of a catalyst for a fuel cell

Patent metadata

Field	Value
Publication number	US-2024128475-A1
Application number	US-202318204134-A
Country	US
Kind code	A1
Filing date	May 31, 2023
Priority date	Oct 17, 2022
Publication date	Apr 18, 2024
Grant date	—

Abstract

A manufacturing method of a catalyst may modify a carbon layer structure by using various heat treatment gases such as inert gas (Ar), hydrogen, and carbon monoxide in a carbon layer manufacturing process, thereby optimizing the carbon layer structure according to the purpose of a metal without changing a size of the metal.

First claim

What is claimed is:

1 . A method of manufacturing a catalyst for a fuel cell, the method comprising:
(A) obtaining a component including a support and an active metal supported on the support; and (B) obtaining a catalyst by heat-treating the component in a gas atmosphere, wherein the gas atmosphere comprises inert gas, nitrogen (N 2 ), hydrogen (H 2 ), carbon monoxide (CO), or any combination thereof, and wherein the catalyst comprises the support, the active metal supported on the support, and a carbon layer coated on a surface of the active metal.

2 . The method of claim 1 , wherein the gas atmosphere is inert gas comprising argon.

3 . The method of claim 1 , wherein the gas atmosphere is a mixed gas atmosphere comprising nitrogen and hydrogen.

4 . The method of claim 3 , wherein the mixed gas atmosphere comprises nitrogen and hydrogen at a volume ratio in a range of 80:20 to 95:5.

5 . The method of claim 1 , wherein the gas atmosphere comprises carbon monoxide.

6 . The method of claim 1 , wherein the gas atmosphere is a mixed gas atmosphere comprising argon and carbon monoxide.

7 . The method of claim 6 , wherein the mixed gas atmosphere comprises argon and carbon monoxide at a volume ratio in a range of 90:10 to 99:1.

8 . The method of claim 1 , wherein operation (B) comprises:
(B-1) primarily heat-treating the component in the gas atmosphere comprising inert gas, nitrogen (N 2 ), hydrogen (H 2 ), carbon monoxide (CO), or any combination thereof; and (B-2) secondarily heat-treating the primarily heat-treated component in the gas atmosphere comprising inert gas, nitrogen (N 2 ), hydrogen (H 2 ), carbon monoxide (CO), or any combination thereof.

9 . The method of claim 8 , wherein the gas atmosphere of operation (B-1) is a mixed gas atmosphere of nitrogen and hydrogen, and wherein the gas atmosphere of operation (B-2) is carbon monoxide.

10 . The method of claim 9 , wherein the mixed gas atmosphere of (B-1) comprises nitrogen and hydrogen at a volume ratio in a range of 80:20 to 95:5.

11 . The method of claim 1 , wherein the catalyst has a particle diameter in a range of 3 nm to 5 nm obtained from Scherrer's equation by using a half width of a peak with respect to a plane 220 of an X-ray diffraction spectrum.

12 . The method of claim 1 , wherein the catalyst has an exposed metal surface area (EMSA) in a range of 0.1 m 2 /g pt to 25 m 2 /g pt .

13 . The method of claim 1 , wherein the catalyst has catalyst activity in an oxygen reduction reaction (ORR) in a range of 0.1V to 0.7V based on −1.5 mA/cm 2 gco .

14 . The method of claim 1 , wherein the catalyst has mass activity in a hydrogen oxidation reaction (HOR) in a range of 0.5 mA/cm 2 gco to 2.0 mA/cm 2 gco based on 0.02V.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Iac In Nat Univ Chungnam

Inventors

• Yuk Seongmin
• Han Kookil
• Noh Woo Yeong
• Jung Namgee
• Min Jiho
• Kim Yunjin
• Ko Keonwoo

Classifications

• H01M4/926 Primary

  on carbon or graphite · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title