Reduction of thin-film ceria on Pt(111) by supported Pd nanoparticles probed with resonant photoemission - Archive ouverte HAL
Article Dans Une Revue Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces Année : 2011

Reduction of thin-film ceria on Pt(111) by supported Pd nanoparticles probed with resonant photoemission

Résumé

Local defects present in CeO 2-x films result in a mixture of Ce 3+ and Ce 4+ oxidation states. Previous studies of the Ce 3d region with XPS have shown that depositing metal nanoparticles on ceria films causes further reduction, with an increase in Ce 3+ concentration. Here, we compare the use of XPS and resonant photoemission spectroscopy (RESPES) to estimate the concentration of Ce 3+ and Ce 4+ in CeO 2-x films grown on Pt (111), and the variation of this concentration as a function of Pd deposition. Due to the nature of the electronic structure of CeO 2-x , resonant peaks are observed for the 4d-4f transitions when the photon energy matches the resonant energy; (hν=121.0 eV) for Ce 3+ and (hν=124.5 eV) for Ce 4+. This results in two discrete resonant photoemission peaks in valence band spectra. The ratio of the difference of these peaks with off-resonance scans gives an indication of the relative contribution of Ce 3+. Results from RESPES indicate reduction of CeO 2-x on deposition of Pd, confirming earlier findings from XPS studies.

Domaines

Matériaux
Fichier principal
Vignette du fichier
CeO2_thinfilm.pdf (7.39 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01323562 , version 1 (20-05-2020)

Identifiants

Citer

J. Matharu, Gregory Cabailh, R. Lindsay, C.L. Pang, D.C. Grinter, et al.. Reduction of thin-film ceria on Pt(111) by supported Pd nanoparticles probed with resonant photoemission. Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2011, 605 (11-12), pp.1062-1066. ⟨10.1016/j.susc.2011.03.005⟩. ⟨hal-01323562⟩
48 Consultations
96 Téléchargements

Altmetric

Partager

More