Carrier-nanoparticle complex, method for preparing same, and catalyst comprising same

Patent metadata

Field	Value
Publication number	US-2017312739-A1
Application number	US-201515520321-A
Country	US
Kind code	A1
Filing date	Nov 4, 2015
Priority date	Nov 4, 2014
Publication date	Nov 2, 2017
Grant date	—

Abstract

The present specification relates to a carrier-nanoparticle complex, a method for preparing the same, and a catalyst comprising the same.

First claim

1 . A method for preparing a carrier-nanoparticle complex in which core-shell nanoparticles are supported on a carrier, the method comprising:
forming a first solution comprising an aqueous solvent, a precursor of a first metal, a precursor of a second metal, and the carrier; forming a core portion comprising the first metal and the second metal by adding a first reducing agent to the first solution; adjusting a pH of the first solution to 8 or more between the forming of the first solution and the forming of the core portion; forming a second solution by adding a Pt precursor to the first solution after the forming of the core portion; forming a shell portion comprising Pt on at least a portion of a surface of the core portion by adding a second reducing agent to the second solution; and adjusting a pH of the second solution to 8 or more between the forming of the second solution and the forming of the shell portion.

2 . The method of claim 1 , wherein the precursor of the first metal and the precursor of the second metal are different transition metal precursors, and at least one of the precursor of the first metal and the precursor of the second metal is a Pd precursor.

3 . (canceled)

4 . The method of claim 1 , wherein the first metal is Pd, and
the second metal is ruthenium (Ru), molybdenum (Mo), vanadium (V), tungsten (W), cobalt (Co), iron (Fe), selenium (Se), nickel (Ni), bismuth (Bi), tin (Sn), chromium (Cr), titanium (Ti), gold (Au), cerium (Ce), silver (Ag) or copper (Cu).

5 . The method of claim 1 , wherein the precursor of the first metal is a nitrate (NO 3 ), a halide, a hydroxide (OH − ) or a sulfate (SO 4 − ) of the first metal, and
the precursor of the second metal is a nitrate (NO 3 − ), a halide, a hydroxide (OH − ) or a sulfate (SO 4 − ) of the second metal.

6 . The method of claim 1 , wherein 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 NO 3 − , NO 2 − , OH − , F − , Cl − , Br − , or I − , m is 2, 4, or 6, and n is an integer of any one of 1 to 7.

7 . (canceled)

8 . (canceled)

9 . The method of claim 1 , wherein at least a portion of a surface of the carrier is coated with a polymer electrolyte which comprises one or more functional groups comprising nitrogen.

10 . The method of claim 9 , wherein the polymer electrolyte comprises a polyallylamine hydrochloride (PAH)-based material or a polyethylene imine (PEI)-based material.

11 . The method of claim 1 , wherein the forming of the core portion is carried out at a temperature of 0° C. or more and 100° C. or less.

12 . The method of claim 1 , wherein the forming of the shell portion is carried out at room temperature.

13 . The method of claim 1 , wherein the aqueous solvent comprises water.

14 . The method of claim 1 , wherein the first solution further comprises a stabilizer.

15 . The method of claim 1 , wherein a molar ratio of the precursor of the first metal to the precursor of the second metal is 1:1 to 1:3.

16 . The method of claim 1 , wherein a mole number of the Pt precursor is 0.5 times to 2 times a mole number of the precursor of the first metal.

17 . A carrier-nanoparticle complex prepared by using the preparation method of claim 1 .

18 . A carrier-nanoparticle complex comprising:
core-shell nanoparticles which comprises a core portion comprising two different transition metals and a shell portion comprising Pt formed on at least a portion of a surface of the core portion; and a carrier on which the core-shell nanoparticles are supported, wherein at least a portion of a surface of the carrier is coated with a polymer electrolyte which comprises one or more functional groups comprising nitrogen, and the at least one core-shell nanoparticle is bonded to a nitrogen atom of the surface of the carrier.

19 . The carrier-nanoparticle complex of claim 18 , wherein the polymer electrolyte comprises a polyallylamine hydrochloride (PAH)-based material or a polyethylene imine (PEI)-based material.

20 . The carrier-nanoparticle complex of claim 18 , wherein as a result of an EDS line scanning of the carrier-nanoparticle complex, a position of Pt of the core-shell nanoparticle is overlapped with a position of N of the polymer electrolyte.

21 . The carrier-nanoparticle complex of claim 18 , wherein the core-shell nanoparticles have a particle diameter of 1 nm or more and 10 nm or less.

22 . The carrier-nanoparticle complex of claim 18 , wherein a content of the core-shell nanoparticles is 20 wt % or more and 50 wt % or less based on the carrier-nanoparticle complex.

23 . (canceled)

24 . A catalyst comprising the carrier-nanoparticle complex of claim 18 .

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M8/00

  Fuel cells; Manufacture thereof · CPC title

• B01J37/0228

  in several steps · CPC title

• B01J23/44

  Palladium · CPC title

• B01J23/42 Primary

  Platinum · CPC title

• B01J27/24

  Nitrogen compounds · CPC title