Carrier-nanoparticle complex, preparation method therefor, and membrane electrode assembly including same

Patent metadata

Field	Value
Publication number	US-10868312-B2
Application number	US-201615742149-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Sep 25, 2015
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

The present specification relates to a carrier-nanoparticle complex, a preparation method therefor, and a membrane electrode assembly including the same.

First claim

The invention claimed is:

1. A method for preparing a carrier-nanoparticle complex, the method comprising:
preparing a carbon carrier having a portion or all of a surface of the carbon carrier coated with a polymer comprising a cationic functional group;
forming core particles by reducing a solution comprising one or more metal precursors, the carbon carrier, and a polyol at a temperature of 120° C. or more and 220° C. or less to form metal core particles supported on the carbon carrier; and
forming core-shell nanoparticles by reducing an aqueous solution consisting of the metal core particles supported on the carbon carrier, a Pt precursor, and water at a temperature of 20° C. or more and 100° C. or less to form a Pt shell on a portion or all of the metal core particle surface,
wherein the core-shell nanoparticles are supported on the carbon carrier, and
the Pt precursor is represented by the following Chemical Formula 1:
PtA m B n   [Chemical Formula 1]

in Chemical Formula 1,
A is (NH 3 ), (CH 3 NH 2 ), or (H 2 O),
B is a monovalent anion,
m is 2, 4, or 6, and
n is any one integer of 1 to 7.

2. The method of claim 1 , wherein the forming of the core particles includes adjusting pH of the solution to 9 or more and 11 or less.

3. The method of claim 1 , wherein the forming of the core-shell nanoparticles includes performing reduction at a temperature of 20° C. or more and 30° C. or less.

4. The method of claim 1 , wherein the polymer comprising the cationic functional group comprises one or more functional groups selected from a group consisting of an amine group, an imine group, and a phosphine group.

5. The method of claim 1 , wherein the core-shell nanoparticles form a bonding structure with the cationic functional group.

6. The method of claim 1 , wherein the polymer comprising the cationic functional group has a weight average molecular weight of 500 g/mol or more and 1,000,000 g/mol or less.

7. The method of claim 1 , wherein the polymer comprising the cationic functional group is a polymer in which a straight or branched hydrocarbon chain is substituted with the cationic functional group.

8. The method of claim 1 , wherein the metal core particles are bonded to cations of the polymer comprising the cationic functional group.

9. The method of claim 1 , wherein in the forming of the core particles, the metal precursor is a precursor of one or more metals selected from a group consisting of Co, Ni, Fe, Pd, Ru, Cr, and Cu.

10. The method of claim 1 , wherein B is NO 3 − , NO 2 − , OH − , F − , Cl − , Br − , or I − .

11. The method of claim 1 , wherein in the forming of the core-shell nanoparticles, the Pt precursor is selected from the group consisting of Pt(NH 3 ) 4 (NO 3 ) 2 , Pt(NH 3 ) 4 Cl 2 , Pt(CH 3 NH 2 ) 4 (NO 3 ) 2 , Pt(CH 3 NH 2 ) 4 Cl 2 , Pt(H 2 O) 4 (NO 3 ) 2 , and Pt(H 2 O) 4 Cl 2 .

12. The method of claim 1 , further comprising:
subjecting the core particles to heat treatment at a temperature of 150° C. or more and 400° C. or less prior to the forming of the core-shell nanoparticles.

13. The method of claim 1 , wherein each step does not use a surfactant.

14. The method of claim 1 , wherein the core-shell nanoparticles have a particle diameter of 3 nm or more and 10 nm or less.

15. A carrier-nanoparticle complex prepared by the method according to claim 1 .

16. A membrane electrode assembly comprising:
an electrode catalyst layer which comprises the carrier-nanoparticle complex according to claim 15 ; and
an electrolyte membrane.

17. A fuel cell comprising:
the membrane electrode assembly according to claim 16 .

Assignees

• Lg Chemical Ltd

Inventors

• Cho Jun Yeon
• Kim Sang Hoon
• Hwang Gyo Hyun
• Kim Kwanghyun
• Choi Ran
• Lee Wonkyun

Classifications

• H01M4/921

  Alloys or mixtures with metallic elements · CPC title

• H01M4/92 Primary

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• H01M4/8657

  layered · CPC title