Carbon-platinum core-shell type catalysts for fuel cells and method for preparing the same

Patent metadata

Field	Value
Publication number	US-2018309137-A1
Application number	US-201715808253-A
Country	US
Kind code	A1
Filing date	Nov 9, 2017
Priority date	Apr 20, 2017
Publication date	Oct 25, 2018
Grant date	—

Abstract

A carbon-platinum core-shell type catalyst for fuel cells and a method for preparing the same which includes carbon as a core and platinum as a shell which can solve durability-associated problems under proton exchange membrane fuel cells (PEMFC) operation conditions and furthermore tackle manufacturing cost-related problems and process complexity by improving acid resistance through incorporation of a carbon material rather than a transition metal into catalysts.

First claim

What is claimed is:

1 . A catalyst for fuel cells, comprising:
a carbon-platinum core-shell structured catalyst comprises carbon as a core and platinum as a shell; and a carbon support supporting the catalyst.

2 . The catalyst for fuel cells according to claim 1 , wherein:
the carbon core is present in an amount of a range from 10 to 12% by weight, with respect to the total weight of the catalyst, and the platinum shell is present in an amount of a range from 88 to 90% by weight, with respect to the total weight of the catalyst.

3 . The catalyst for fuel cells according to claim 1 , wherein the catalyst has a particle average size in a range from 8 to 12 nm.

4 . A method of manufacturing a carbon-platinum core-shell type catalyst for fuel cells comprising:
(a) mixing a ketone compound of acetone or pentanedione with a potassium hydroxide (KOH) solution and then inducing spontaneous polymerization to produce carbon nanoparticles; (b) adding the carbon nanoparticles produced in step (a) to an ethylene glycol solution, dropwise adding a platinum precursor thereto and conducting reaction to produce core-shell structured carbon-platinum nanoparticles; and (c) dispersing a carbon support in an alcohol solvent, adding the core-shell structured carbon-platinum nanoparticles in the dispersion and conducting stirring.

5 . The method according to claim 4 , wherein, in step (a), the spontaneous polymerization is carried out by mixing the ketone compound with the potassium hydroxide (KOH) solution in a weight ratio of 1:0.2 to 1:0.25 and allowing to stand for 24 to 36 hours at 25 to 30° C. to induce spontaneous polymerization.

6 . The method according to claim 4 , wherein, in step (b), 0.12 to 0.125 parts by weight of the carbon nanoparticles and 0.164 to 0.173 parts by weight of the platinum precursor are used, with respect to 100 parts by weight of the ethylene glycol solution.

7 . The method according to claim 4 , wherein, in step (b), the reaction is carried out at 150 to 180° C. for 1 to 5 hours.

8 . The method according to claim 4 , wherein, in step (c), 0.075 to 0.085 parts by weight of the core-shell structured carbon-platinum nanoparticles is used, with respect to 100 parts by weight of the alcohol solvent.

9 . The catalyst for fuel cells according to claim 1 , wherein the core is formed as a nanoparticle by self-assembly or polymerization.

10 . The catalyst for fuel cells according to claim 1 , wherein the catalyst has a half wave potential of about 902 mV after accelerated durability test.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Jun Tae

Classifications

• H01M4/926 Primary

  on carbon or graphite · CPC title

• B01J37/084

  Decomposition of carbon-containing compounds into carbon · CPC title

• B01J37/343

  of ultrasonic wave energy · CPC title

• H01M4/96 Primary

  Carbon-based electrodes · CPC title

• H01M4/8825

  Methods for deposition of the catalytic active composition · CPC title