Atomic Scale Insights into Reversible Oxygen Storage in Vanadium Oxide Thin Films.

Autor: Missaoui G; Carl von Ossietzky University Oldenburg, Institute of Physics, D-26111, Oldenburg, Germany., Wemhoff PI; Carl von Ossietzky University Oldenburg, Institute of Physics, D-26111, Oldenburg, Germany., Nilius N; Carl von Ossietzky University Oldenburg, Institute of Physics, D-26111, Oldenburg, Germany.
Jazyk: angličtina
Zdroj: Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2024 Jul 02; Vol. 25 (13), pp. e202300988. Date of Electronic Publication: 2024 May 02.
DOI: 10.1002/cphc.202300988
Abstrakt: Monolayer vanadium oxide films grown on Pt(111) can be reversibly switched between an oxygen-poor and an oxygen-rich composition, equivalent to V 2 O 3 and V 2 O 5 , respectively. While the overall oxygen storage capacity of the film is quantified by X-ray photoelectron spectroscopy, the atomic binding sites of the extra O species are determined by low-temperature scanning tunneling microscopy and electron diffraction. In the O-poor phase, the oxide takes the form of a honeycomb lattice that gets partially covered with vanadyl (V=O) groups at higher O exposure. Upon transition to the O-rich phase, isolated V 6 O 12 rings emerge in the film first, which then evolves towards a disordered O-V-O trilayer on the Pt(111) surface. Our works thus unravels the microscopic nature of reversible oxygen storage in a model system for heterogeneous catalysis.
(© 2024 The Authors. ChemPhysChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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