Ternary alloy catalyst and method for preparing the same

Patent metadata

Field	Value
Publication number	US-11848452-B2
Application number	US-202117391643-A
Country	US
Kind code	B2
Filing date	Aug 2, 2021
Priority date	Jan 8, 2021
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

Provided is a method of preparing a ternary alloy catalyst that includes irradiating ultrasonic waves to a precursor admixture including a precursor of a noble metal, a precursor of a first transition metal, a precursor of a second transition metal, and a carrier. Particularly, the precursor of the second transition metal is an acetate-based precursor.

First claim

What is claimed is:

1. A method of preparing a ternary alloy catalyst, comprising:
treating a precursor admixture comprising a precursor of a noble metal, a precursor of a first transition metal and a precursor of a second transition metal,
wherein the precursor of the second transition metal is an acetate-based precursor,
wherein the precursor admixture is treated with ultrasonic waves, and
wherein the treating with the ultrasonic waves is performed for about 2 hours to about 6 hours at an output of about 100 W to about 300 W based on 100 mL of the precursor admixture.

2. The method of claim 1 wherein the precursor admixture comprises a carrier.

3. The method of claim 1 , wherein the noble metal comprises one or more selected from the group consisting of platinum (Pt), ruthenium (Ru), osmium (Os), iridium (Ir), palladium (Pd), and an alloy thereof.

4. The method of claim 1 , wherein the precursor of the noble metal comprises one or more selected from the group consisting of a nitrate, a sulfate, an acetate, a chloride, an oxide, and an acetylacetonate of the noble metal.

5. The method of claim 1 , wherein the first transition metal and the second transition metal are different transition metals.

6. The method of claim 1 , wherein the first transition metal or the second transition metal comprises one or more selected from the group consisting of cobalt (Co), iron (Fe), nickel (Ni), zinc (Zn), tin (Sn), manganese (Mn), copper (Cu), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), zirconium (Zr), yttrium (Y), niobium (Nb), lanthanum (La), and an alloy thereof.

7. The method of claim 1 , wherein the precursor of the first transition metal comprises one or more selected from the group consisting of a nitrate, a sulfate, an acetate, a chloride, an oxide, and an acetylacetonate of the first transition metal.

8. The method of claim 2 , wherein the carrier comprises one or more selected from the group consisting of carbon black, graphite, carbon nanofiber, graphitized carbon nanofiber, carbon nanotube, carbon nanohorn, and carbon nanowire.

9. The method of claim 1 , wherein in the treating with ultrasonic waves, core-shell particles comprising a transition metal oxide coating layer is formed, and
wherein the transition metal oxide coating layer is formed on the core-shell particles, and
wherein the transition metal oxide includes an oxide of the first transition metal and an oxide of the second transition metal.

10. The method of claim 9 , wherein the core-shell particles comprise:
a transition metal core comprising the first transition metal and the second transition metal,
a shell surrounding the transition metal core and comprising the noble metal, and
the transition metal oxide coating layer surrounding the shell and including the oxide of the first transition metal and the oxide of the second transition metal.

11. The method of claim 9 , wherein a thickness of the transition metal oxide coating layer is about 0.2 nm to about 0.88 nm.

12. The method of claim 9 , further comprising:
annealing the core-shell particles to form alloy particles comprising the transition metal oxide coating layer, and
removing the transition metal oxide coating layer from the alloy particles.

13. The method of claim 12 , wherein each of the alloy particles comprises:
an alloy core comprising an alloy of the first transition metal and the second transition metal, and
a noble metal skin layer surrounding the alloy core and including the noble metal.

14. The method of claim 12 , wherein the annealing is performed at a temperature of about 200° C. to about 400° C. for about 0.5 hours to about 16 hours.

15. The method of claim 12 , wherein the removing of the transition metal oxide coating layer from the alloy particles is performed by acid treatment.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Jang Ji-Hoon
• Hwang Jee Youn
• Lee Eunjik

Classifications

• H01M4/921 Primary

  Alloys or mixtures with metallic elements · CPC title

• H01M4/8657

  layered · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• B01J37/343 Primary

  of ultrasonic wave energy · CPC title

• H01M4/88

  Processes of manufacture · CPC title