Method of producing Pt alloy catalyst using protective coating of carbon layer and ozone

Patent metadata

Field	Value
Publication number	US-10038200-B2
Application number	US-201715838069-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 13, 2016
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A method of producing a catalyst including a platinum-transition metal alloy on carbon, more specifically, a method of producing a carbon supported platinum alloy catalyst with high activity and superior durability includes coating a carbon-supported catalyst with an organic polymer as a material for a carbon layer, heat-treating the catalyst under a hydrogen-deficient atmosphere to convert the organic polymer into the carbon layer to prevent growth of catalyst particles caused by heat treatment through the carbon layer, allowing, at the same time, a transition metal supported together with platinum to be diffused into platinum particles to form a catalyst having a core-shell structure including a platinum skin layer on a surface thereof, and removing the carbon layer by ozone treatment after the heat treatment to induce an electrochemical reaction on the surface of the catalyst.

First claim

What is claimed is:

1. A method of producing a carbon supported platinum alloy catalyst comprising:
coating, with an organic polymer, a Pt/C catalyst comprising platinum (Pt) supported on a carbon support;
depositing a transition metal (M) precursor on the organic polymer-coated Pt/C catalyst and heat treating the Pt/C catalyst under a hydrogen-deficient atmosphere to produce a carbon layer-coated Pt-M/C catalyst; and
treating the carbon layer-coated Pt-M/C catalyst with ozone (O 3 ) to produce a carbon supported platinum alloy (Pt-M/C) catalyst, the carbon layer of which is removed.

2. The method according to claim 1 , wherein the transition metal (M) comprises at least one selected from a group consisting of nickel (Ni), palladium (Pd), copper (Cu), silver (Ag), gold (Au), titanium (Ti), zirconium (Zr), vanadium (V), chromium (Cr), iron (Fe), ruthenium (Ru), cobalt (Co) and rhodium (Rh).

3. The method according to claim 1 , wherein the transition metal (M) is nickel (Ni) or palladium (Pd).

4. The method according to claim 1 , wherein the organic polymer comprises at least one selected from a group consisting of polypyrrole (PPy), polyaniline (PANI) and polydopamine (PDA).

5. The method according to claim 1 , wherein the carbon support comprises at least one selected from a group consisting of carbon black and crystalline carbon.

6. The method according to claim 5 , wherein the crystalline carbon comprises at least one selected from a group consisting of carbon nanotube (CNT), carbon nanofiber (CNF), carbon nanocoil, and carbon nanocage (CNC).

7. The method according to claim 1 , wherein the carbon support is carbon nanocage (CNC) or carbon nanotube (CNT).

8. The method according to claim 1 , wherein the heat treatment is conducted under an inert gas at 700° C. to 1,200° C.

9. The method according to claim 8 , wherein the inert gas contains hydrogen of an amount less than 5% by volume.

10. The method according to claim 9 , wherein the inert gas is argon.

11. A method of producing a carbon supported platinum alloy catalyst comprising:
coating, with an organic polymer, a Pt-M/C catalyst comprising platinum (Pt) and a transition metal (M) supported on a carbon support;
heat-treating the organic polymer-coated Pt-M/C catalyst under a hydrogen-deficient atmosphere to produce a carbon layer-coated Pt-M/C catalyst; and
treating the carbon layer-coated Pt-M/C catalyst with ozone (O 3 ) to produce a carbon supported platinum alloy (Pt-M/C) catalyst, the carbon layer of which is removed.

12. The method according to claim 11 , wherein the transition metal (M) comprises at least one selected from a group consisting of nickel (Ni), palladium (Pd), copper (Cu), silver (Ag), gold (Au), titanium (Ti), zirconium (Zr), vanadium (V), chromium (Cr), iron (Fe), ruthenium (Ru), cobalt (Co) and rhodium (Rh).

13. The method according to claim 11 , wherein the transition metal (M) is nickel (Ni) or palladium (Pd).

14. The method according to claim 11 , wherein the organic polymer comprises at least one selected from a group consisting of polypyrrole (PPy), polyaniline (PANI) and polydopamine (PDA).

15. The method according to claim 11 , wherein the carbon support comprises at least one selected from a group consisting of carbon black and crystalline carbon.

16. The method according to claim 15 , wherein the crystalline carbon comprises at least one selected from a group consisting of carbon nanotube (CNT), carbon nanofiber (CNF), carbon nanocoil, and carbon nanocage (CNC).

17. The method according to claim 11 , wherein the carbon support is carbon nanocage (CNC) or carbon nanotube (CNT).

18. The method according to claim 11 , wherein the heat treatment is conducted under an inert gas at 700° C. to 1,200° C.

19. The method according to claim 18 , wherein the inert gas contains hydrogen in an amount less than 5% by volume.

20. The method according to claim 19 , wherein the inert gas is argon.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Industry Academy Cooperation Foundation Yonsei Univ
• Industry Academy Corporation Foundation Yonsei Univ

Inventors

• Kim Won Jung
• Lee Ju Hee
• Kim Jun Tae
• Song You Jung
• Park Ju Ahn
• Kim Han Sung
• Lee Woong Hee

Classifications

• H01M4/9083

  on carbon or graphite · CPC title

• H01M4/8825

  Methods for deposition of the catalytic active composition · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• H01M4/9041

  Metals or alloys (H01M4/92 takes precedence) · CPC title

• H01M4/921

  Alloys or mixtures with metallic elements · CPC title