Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Oxides II: Structures, Interactions and Reducibility

O 20.6: Vortrag

Montag, 16. März 2020, 17:00–17:15, WIL B321

Atomic structure of cubic ceria surfaces: an IR spectroscopic study — Chengwu Yang, •Junjun Wang, Xiaojuan Yu, Alexei Nefedov, Stefan Heissler, Christof Wöll, and Yuemin Wang — Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany

Polar surfaces of solid ionic compounds exhibit unique physical and chemical properties but they are intrinsically instable due to a diverging electrostatic energy. A fundamental understanding of the compensation mechanisms is a key but challenging issue. Here, we present an atomic-level picture of the stabilization mechanisms governing the surface polarity compensation of cube-shaped ceria nanoparticles based on a thorough surface science study on polar CeO2(100) single-crystal surfaces using primarily temperature and polarization-resolved infrared reflection absorption spectroscopy (IRRAS). The results obtained by IRRAS in conjunction with high-resolution transmission electron microscopy and density functional theory calculations reveal a multistep scenario for polarity compensation at the polar (100) surface of ceria.