Preparation of a carbon-supported pt-ni bimetallic catalyst with a Pt-rich shell using a dopamine as protective coating

Youngick Cho, Woong Hee Lee, Hansung Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A carbon-supported Pt 2 Ni 1 catalyst with a Pt rich shell was prepared using a high temperature treatment. In this process, polydopamine (PDA) encapsulates whole Pt/C and acts as a protective coating layer to suppress sintering effects of particles during the high temperature treatment. Dopamine, a mussel-inspired substrate, is an effective surface coating material because the polymerization of dopamine takes place easily at room temperature and exhibits a strong adhesive function with almost any surface. With increasing thickness of the PDA coating layer, the particle size became smaller following heat-treatment. However, when excess PDA was used, residue remained on the surface of catalyst. As a result, the active surface area of catalyst was reduced, thereby resulting in lowered catalytic performance. The Pt 2 Ni 1 /C catalyst prepared with an optimized amount of PDA layer exhibited improved mass activity of 0.43 A mg Pt −1 at 0.9 V, which is almost two times higher than that of Pt/C.

Original languageEnglish
Pages (from-to)F65-F70
JournalJournal of the Electrochemical Society
Volume164
Issue number2
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Protective coatings
Dopamine
Carbon
Catalysts
Coatings
Temperature
Adhesives
Sintering
Particle size
Heat treatment
Polymerization
polydopamine
Substrates

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 carbon-supported Pt 2 Ni 1 catalyst with a Pt rich shell was prepared using a high temperature treatment. In this process, polydopamine (PDA) encapsulates whole Pt/C and acts as a protective coating layer to suppress sintering effects of particles during the high temperature treatment. Dopamine, a mussel-inspired substrate, is an effective surface coating material because the polymerization of dopamine takes place easily at room temperature and exhibits a strong adhesive function with almost any surface. With increasing thickness of the PDA coating layer, the particle size became smaller following heat-treatment. However, when excess PDA was used, residue remained on the surface of catalyst. As a result, the active surface area of catalyst was reduced, thereby resulting in lowered catalytic performance. The Pt 2 Ni 1 /C catalyst prepared with an optimized amount of PDA layer exhibited improved mass activity of 0.43 A mg Pt −1 at 0.9 V, which is almost two times higher than that of Pt/C.",
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Preparation of a carbon-supported pt-ni bimetallic catalyst with a Pt-rich shell using a dopamine as protective coating. / Cho, Youngick; Lee, Woong Hee; Kim, Hansung.

In: Journal of the Electrochemical Society, Vol. 164, No. 2, 01.01.2017, p. F65-F70.

Research output: Contribution to journalArticle

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AB - A carbon-supported Pt 2 Ni 1 catalyst with a Pt rich shell was prepared using a high temperature treatment. In this process, polydopamine (PDA) encapsulates whole Pt/C and acts as a protective coating layer to suppress sintering effects of particles during the high temperature treatment. Dopamine, a mussel-inspired substrate, is an effective surface coating material because the polymerization of dopamine takes place easily at room temperature and exhibits a strong adhesive function with almost any surface. With increasing thickness of the PDA coating layer, the particle size became smaller following heat-treatment. However, when excess PDA was used, residue remained on the surface of catalyst. As a result, the active surface area of catalyst was reduced, thereby resulting in lowered catalytic performance. The Pt 2 Ni 1 /C catalyst prepared with an optimized amount of PDA layer exhibited improved mass activity of 0.43 A mg Pt −1 at 0.9 V, which is almost two times higher than that of Pt/C.

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