Vibrational fingerprint of the catalytically-active FeO2-x iron oxide phase on Pt(1 1 1)

Rok publikacji: 2020
Wydawca:  Applied Surface Science, 2020, 512, 145774
Zobacz publikację
M. Stojkovska, R. Davì, G. Carraro, M. Smerieri, M. Lewandowski, M. Rocca, L. Vattuone, L. Savio
We report here on the oxidation of monolayer FeO islands on Pt(1 1 1) into the highly-reactive FeO2-x phase by high-temperature oxidation under Ultra High Vacuum (UHV) conditions. The chemical composition and characteristic phonon modes of both FeO and FeO2-x films were investigated by X-ray photoemission Spectroscopy (XPS) and High Resolution Electron Energy Loss Spectroscopy (HREELS). The reactivity and thermal stability of the “oxygen-rich” FeO2-x phase were studied with respect to the CO oxidation reaction at 450 K and to annealing in UHV at 563 K, respectively. By performing repeated oxidation/reduction cycles, we have identified the vibrational mode at 76 meV as the unique signature of the FeO2-x phase and confirmed the already reported ability of CO to reduce such oxide at 450 K. The latter process is not fully reversible, suggesting a modification of the active sites upon CO adsorption.

Kontakt | Baza kontaktów | RSS | Login
© 2020 CENTRUM NANOBIOMEDYCZNE UAM | ul. Wszechnicy Piastowskiej 3, PL 61614 Poznań, Poland | tel.+48 61 829 67 04.