41 Citations (Scopus)

Abstract

Platinum-oxide nanoparticles were prepared through the radio-frequency (RF) discharge sputtering of a Pt electrode in an oxygen atmosphere. The structure, particles size, electronic properties, and surface composition of the RF-sputtered particles were studied by using transmission electron microscopy and X-ray photoelectron spectroscopy. The application of the RF discharge method resulted in the formation of highly oxidized Pt4+ species that were stable under ultrahigh vacuum conditions up to 100°C, indicating the capability of Pt4+-O species to play an important role in the oxidation catalysis under real conditions. The thermal stability and reaction probability of Pt4+ oxide species were analyzed and compared with those of Pt2+ species. The reaction probability of PtO2 nanoparticles at 90°C was found to be about ten times higher than that of PtO-like structures.

Original languageEnglish
Pages (from-to)3318-3324
Number of pages7
JournalChemPhysChem
Volume16
Issue number15
DOIs
Publication statusPublished - 1 Oct 2015

Keywords

  • CO oxidation
  • nanoparticles
  • platinum oxide
  • radio-frequency sputtering
  • X-ray photoelectron spectroscopy

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