Preparation of carbon-supported Pt–Ru core-shell nanoparticles using carbonized polydopamine and ozone for a CO tolerant electrocatalyst

Gilltae Roh, H. Lee, Yoonjae Jeong, Jung Hwan Kim, Hansung Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Carbon supported Ru@Pt/C catalysts with a Ru-rich core and Pt-rich shell structure are prepared by the solid-state diffusion of Pt and Ru via high-temperature heat treatment. In general, heat treatment at high temperatures causes a sintering effect that leads to the aggregation of nanoparticles into larger particles. Carbonized polydopamine is introduced as a protective coating to inhibit the movement of particles during the high-temperature heat treatment. This carbon layer, which inhibits the particle grain growth, should, however be removed after heat treatment because it blocks the active sites required for the hydrogen oxidation reaction. In this study, ozone treatment at room temperature for 15 min is used to effectively remove the carbon layer on the catalyst surface. Energy-dispersive X-ray spectroscopic line scan profile and X-ray photoelectron spectroscopic analysis confirm that the PtRu/C catalyst has a Ru-rich core and Pt-rich shell structure. From CO stripping voltammetry and polymer electrolyte membrane fuel cell tests using CO containing H2 gas, the core-shell structured PtRu/C alloy formed by high-temperature annealing is demonstrated to have higher tolerance to CO poisoning than PtRu/C catalysts synthesized by co-deposition via the polyol method.

Original languageEnglish
Pages (from-to)21588-21596
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number39
DOIs
Publication statusPublished - 2019 Aug 13

Fingerprint

electrocatalysts
Electrocatalysts
Ozone
ozone
heat treatment
Nanoparticles
catalysts
nanoparticles
preparation
Carbon
Heat treatment
carbon
Catalysts
Temperature
protective coatings
Catalyst poisoning
poisoning
spectroscopic analysis
X rays
stripping

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "Preparation of carbon-supported Pt–Ru core-shell nanoparticles using carbonized polydopamine and ozone for a CO tolerant electrocatalyst",
abstract = "Carbon supported Ru@Pt/C catalysts with a Ru-rich core and Pt-rich shell structure are prepared by the solid-state diffusion of Pt and Ru via high-temperature heat treatment. In general, heat treatment at high temperatures causes a sintering effect that leads to the aggregation of nanoparticles into larger particles. Carbonized polydopamine is introduced as a protective coating to inhibit the movement of particles during the high-temperature heat treatment. This carbon layer, which inhibits the particle grain growth, should, however be removed after heat treatment because it blocks the active sites required for the hydrogen oxidation reaction. In this study, ozone treatment at room temperature for 15 min is used to effectively remove the carbon layer on the catalyst surface. Energy-dispersive X-ray spectroscopic line scan profile and X-ray photoelectron spectroscopic analysis confirm that the PtRu/C catalyst has a Ru-rich core and Pt-rich shell structure. From CO stripping voltammetry and polymer electrolyte membrane fuel cell tests using CO containing H2 gas, the core-shell structured PtRu/C alloy formed by high-temperature annealing is demonstrated to have higher tolerance to CO poisoning than PtRu/C catalysts synthesized by co-deposition via the polyol method.",
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Preparation of carbon-supported Pt–Ru core-shell nanoparticles using carbonized polydopamine and ozone for a CO tolerant electrocatalyst. / Roh, Gilltae; Lee, H.; Jeong, Yoonjae; Kim, Jung Hwan; Kim, Hansung.

In: International Journal of Hydrogen Energy, Vol. 44, No. 39, 13.08.2019, p. 21588-21596.

Research output: Contribution to journalArticle

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AU - Kim, Hansung

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AB - Carbon supported Ru@Pt/C catalysts with a Ru-rich core and Pt-rich shell structure are prepared by the solid-state diffusion of Pt and Ru via high-temperature heat treatment. In general, heat treatment at high temperatures causes a sintering effect that leads to the aggregation of nanoparticles into larger particles. Carbonized polydopamine is introduced as a protective coating to inhibit the movement of particles during the high-temperature heat treatment. This carbon layer, which inhibits the particle grain growth, should, however be removed after heat treatment because it blocks the active sites required for the hydrogen oxidation reaction. In this study, ozone treatment at room temperature for 15 min is used to effectively remove the carbon layer on the catalyst surface. Energy-dispersive X-ray spectroscopic line scan profile and X-ray photoelectron spectroscopic analysis confirm that the PtRu/C catalyst has a Ru-rich core and Pt-rich shell structure. From CO stripping voltammetry and polymer electrolyte membrane fuel cell tests using CO containing H2 gas, the core-shell structured PtRu/C alloy formed by high-temperature annealing is demonstrated to have higher tolerance to CO poisoning than PtRu/C catalysts synthesized by co-deposition via the polyol method.

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