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	Ce=O terminated CeO2 David Charles Grinter , Michael Allan , Hyun Jin Yang , Agustín Salcedo , Gustavo E. Murgida , Bobbie-Jean Shaw , Chi L. Pang , Hicham Idriss , M. Verónica Ganduglia-Pirovano , Geoff Thornton Angewandte Chemie International Edition DOI: 10.1002/anie.202101771 Open Access Show Abstract ▼ Abstract: Multiply‐bonded lanthanide oxo groups are rare in coordination compounds and have not previously been reported for a surface termination of a lanthanide oxide. Here we report the observation of a Ce=O terminated ceria surface in a CeO 2 (111)‐( [[EQUATION]] x [[EQUATION]] )R30° reconstruction of ~3 nm thick ceria islands prepared on Pt(111). This is evidenced by scanning tunnelling microscopy, low energy electron diffraction and high‐resolution electron energy loss spectroscopy (HREELS) measurements in conjunction with density functional theory (DFT) calculations. A Ce=O stretching frequency of 775 cm ‐1 is observed in HREELS, compared with 766 cm ‐1 calculated by DFT. The calculations also predict that the Ce=O bond is weak, with an oxygen vacancy formation energy of 0.85 eV. This could play an important role in the facile removal of lattice oxygen from CeO 2 , accompanied by the reduction of Ce IV to Ce III , which is a key attribute of ceria‐based systems in connection with their unique catalytic properties.	Apr 2021

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Ce=O terminated CeO2

David Charles Grinter , Michael Allan , Hyun Jin Yang , Agustín Salcedo , Gustavo E. Murgida , Bobbie-Jean Shaw , Chi L. Pang , Hicham Idriss , M. Verónica Ganduglia-Pirovano , Geoff Thornton

Angewandte Chemie International Edition

DOI: 10.1002/anie.202101771