Vibrational fingerprint of the catalytically-active FeO 2-x iron oxide phase on Pt(1 1 1)
Applied Surface Science, ISSN: 0169-4332, Vol: 512, Page: 145774
2020
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Article Description
We report here on the oxidation of monolayer FeO islands on Pt(1 1 1) into the highly-reactive FeO 2-x phase by high-temperature oxidation under Ultra High Vacuum (UHV) conditions. The chemical composition and characteristic phonon modes of both FeO and FeO 2-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” FeO 2-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 FeO 2-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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0169433220305304; http://dx.doi.org/10.1016/j.apsusc.2020.145774; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85079401435&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0169433220305304; https://api.elsevier.com/content/article/PII:S0169433220305304?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S0169433220305304?httpAccept=text/plain; https://dul.usage.elsevier.com/doi/; https://dx.doi.org/10.1016/j.apsusc.2020.145774
Elsevier BV
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