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 language | English |
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Pages (from-to) | 3318-3324 |
Number of pages | 7 |
Journal | ChemPhysChem |
Volume | 16 |
Issue number | 15 |
DOIs | |
Publication status | Published - 1 Oct 2015 |
Keywords
- CO oxidation
- nanoparticles
- platinum oxide
- radio-frequency sputtering
- X-ray photoelectron spectroscopy