Method for preparing catalyst having conductive oxide protective layer and catalyst prepared thereby

Patent metadata

Field	Value
Publication number	US-11278878-B2
Application number	US-202016800498-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Mar 21, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

Disclosed is a method of preparing a catalyst having a conductive oxide protective layer. The method may include providing (e.g., supplying) a carbon support having a metal catalyst supported thereon to a fluidized bed reactor, and forming a conductive oxide protective layer using atomic layer deposition (ALD). Particularly, the atomic layer deposition may include supplying a conductive oxide precursor to the fluidized bed reactor, conducting a first purging by supplying an inert gas to the fluidized bed reactor, converting the conductive oxide precursor to conductive oxide by supplying a reactive gas to the fluidized bed reactor, and conducting a second purging by supplying an inert gas to the fluidized bed reactor.

First claim

What is claimed is:

1. A method of preparing a catalyst comprising a conductive oxide protective layer comprising:
providing a carbon support comprising a metal catalyst supported thereon to a fluidized bed reactor; and
forming a conductive oxide protective layer using atomic layer deposition (ALD),
wherein the atomic layer deposition comprises:
supplying a conductive oxide precursor to the fluidized bed reactor;
conducting a first purging by supplying an inert gas to the fluidized bed reactor;
converting the conductive oxide precursor to conductive oxide by supplying a reactive gas to the fluidized bed reactor; and
conducting a second purging by supplying an inert gas to the fluidized bed reactor.

2. The method according to claim 1 , wherein the metal catalyst comprises platinum (Pt).

3. The method according to claim 1 , further comprising adjusting an internal pressure of the fluidized bed reactor to about 0.1 Torr to 0.5 Torr, after the providing the carbon support to the fluidized bed reactor and before the forming the conductive oxide protective layer.

4. The method according to claim 1 , wherein, in the supplying a conductive oxide precursor to the fluidized bed reactor, the conductive oxide precursor comprises titanium (IV) isopropoxide (Ti[OCH(CH 3 ) 2 ] 4 , tin (IV) chloride (SnCl 4 ) and a combination thereof.

5. The method according to claim 1 , wherein, in the supplying the conductive oxide precursor to the fluidized bed reactor, a deposition operation pressure of the conductive oxide precursor is about 1 Torr to 5 Torr.

6. The method according to claim 1 , wherein, in the supplying the conductive oxide precursor to the fluidized bed reactor, the conductive oxide precursor is supplied to the fluidized bed reactor for about 20 to 100 seconds.

7. The method according to claim 1 , wherein, in the converting the conductive oxide precursor to conductive oxide, the reaction gas comprises water vapor (H 2 O).

8. The method according to claim 1 , wherein, in the converting the conductive oxide precursor to conductive oxide, the reaction gas is supplied to the fluidized bed reactor at a flow rate from about 10 sccm to about 200 sccm.

9. The method according to claim 1 , wherein, in the converting the conductive oxide precursor to conductive oxide, the conductive oxide comprises titanium dioxide (TiO 2 ), tin dioxide (SnO 2 ) and a combination thereof.

10. The method according to claim 1 , wherein, in the first purging and the second purging, the inert gas is purged at a flow rate from about 50 sccm to about 200 sccm.

11. The method according to claim 1 , wherein, in the first purging and the second purging, the inert gas is purged for about 60 to 120 seconds.

12. The method according to claim 1 , wherein the atomic layer deposition is repeatedly conducted.

13. The method according to claim 12 , wherein the atomic layer deposition is repeatedly conducted about 1 to 20 times.

14. A catalyst comprising a conductive oxide protective layer prepared by the method according to claim 1 , comprising:
a carbon support;
metal catalyst particles supported on the carbon support; and
a conductive oxide protective layer formed on surfaces of the metal catalyst particles.

15. The catalyst according to claim 14 , wherein the conductive oxide protective layer has a thickness of about 0.05 nm to 10 nm.

16. The catalyst according to claim 14 , wherein the metal catalyst particles comprise platinum (Pt).

17. The catalyst according to claim 14 , wherein the conductive oxide protective layer comprises a conductive oxide comprising titanium dioxide (TiO 2 ), tin dioxide (SnO 2 ) or a combination thereof.

18. A polymer electrolyte membrane for a fuel cell comprising a catalyst of claim 14 .

19. A fuel cell comprising a polymer electrolyte membrane of claim 18 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Institute For Research & Industry Cooperation Pusan National Univ

Inventors

• Oh Seung Jeong
• Hong Woong Pyo
• Lee Woo Jae
• Kwon Se Hun

Classifications

• B01J37/349

  making use of flames, plasmas or lasers · CPC title

• H01M4/8663

  Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers · CPC title

• C23C16/407

  of zinc, germanium, cadmium, indium, tin, thallium or bismuth · CPC title

• C23C16/45555

  applied in non-semiconductor technology · CPC title

• H01M4/926

  on carbon or graphite · CPC title