Redox behavior of the model catalyst Pd/CeO2-x/Pt(111)
journal contribution
posted on 2023-06-08, 05:29authored byE L Wilson, R Grau-Crespo, C L Pang, G Cabailh, Qiao ChenQiao Chen, J A Purton, C R A Catlow, Wendy BrownWendy Brown, N H de Leeuw, G Thornton
Photoelectron spectroscopy and scanning tunneling microscopy have been used to investigate how the oxidation state of Ce in CeO2-x(111) ultrathin films is influenced by the presence of Pd nanoparticles. Pd induces an increase in the concentration of Ce3+ cations, which is interpreted as charge transfer from Pd to CeO2-x(111) on the basis of DFT+U calculations. Charge transfer from Pd to Ce4+ is found to be energetically favorable even for individual Pd adatoms. These results have implications for our understanding of the redox behavior of ceria-based model catalyst systems.