A synthetic route for the preparation of core-shell nanoparticles using a protective carbon layer and ozone treatment

Youngick Cho, Hojin Lee, Yoonjae Jeong, Hansung Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A novel synthetic process was developed to synthesize nano-sized core-shell catalysts through atomic rearrangement by heat-treatment. Agglomeration of nanoparticles caused by the high-temperature heat-treatment was alleviated by using a modified protective coating method. In this method, the carbon layer formed by the carbonization of polydopamine serves as a protective coating layer, which suppresses the sintering of the catalyst particles continuously until the high-temperature heat-treatment is completed. Later, the carbonized carbon layer is removed by ozone treatment because it blocks the active site of the catalyst. Since ozone is a highly oxidative gas, it can selectively remove the carbon layer at room temperature in just 7 minutes without affecting the physical properties of the catalyst itself, which makes this method suitable for mass production. The Pt-based alloy catalyst was prepared by this unique process was proved to have a Pt-rich shell structure, and the particles can remain small (∼5 nm) even after high-temperature heat-treatment, thus exhibiting high oxygen reduction reaction (ORR) activity in fuel cells.

Original languageEnglish
Pages (from-to)F285-F290
JournalJournal of the Electrochemical Society
Volume165
Issue number5
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

Stratospheric Ozone
Ozone
ozone
Carbon
routes
Nanoparticles
catalysts
heat treatment
nanoparticles
preparation
Catalysts
Heat treatment
carbon
protective coatings
Protective coatings
Temperature
carbonization
Carbonization
agglomeration
fuel cells

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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abstract = "A novel synthetic process was developed to synthesize nano-sized core-shell catalysts through atomic rearrangement by heat-treatment. Agglomeration of nanoparticles caused by the high-temperature heat-treatment was alleviated by using a modified protective coating method. In this method, the carbon layer formed by the carbonization of polydopamine serves as a protective coating layer, which suppresses the sintering of the catalyst particles continuously until the high-temperature heat-treatment is completed. Later, the carbonized carbon layer is removed by ozone treatment because it blocks the active site of the catalyst. Since ozone is a highly oxidative gas, it can selectively remove the carbon layer at room temperature in just 7 minutes without affecting the physical properties of the catalyst itself, which makes this method suitable for mass production. The Pt-based alloy catalyst was prepared by this unique process was proved to have a Pt-rich shell structure, and the particles can remain small (∼5 nm) even after high-temperature heat-treatment, thus exhibiting high oxygen reduction reaction (ORR) activity in fuel cells.",
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A synthetic route for the preparation of core-shell nanoparticles using a protective carbon layer and ozone treatment. / Cho, Youngick; Lee, Hojin; Jeong, Yoonjae; Kim, Hansung.

In: Journal of the Electrochemical Society, Vol. 165, No. 5, 01.01.2018, p. F285-F290.

Research output: Contribution to journalArticle

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