Distinct Physicochemical Properties of the First Ceria Monolayer on Cu(111)
- Lucie Szabová
- ,
- Oleksandr Stetsovych
- ,
- Filip Dvořák
- ,
- Matteo Farnesi Camellone
- ,
- Stefano Fabris
- ,
- Josef Mysliveček
- , and
- Vladimír Matolín
Abstract

Discontinuous ceria layers on Cu(111) represent heterogeneous catalysts with notable activities in water–gas shift and CO oxidation reactions. Ultrathin ceria islands in these catalysts are composed of monolayers of ceria exhibiting CeO2(111) surface ordering and bulklike vertical stacking (O–Ce–O) down to a single ceria monolayer representing the oxide-metal interface. Scanning tunneling microscopy (STM) reveals marked differences in strain buildup and the structure of oxygen vacancies in this first ceria monolayer compared to thicker ceria layers on Cu(111). Ab-initio calculations allow us to trace back the distinct properties of the first ceria monolayer to pronounced finite size effects when the limiting thickness of the oxide monolayer and the proximity of metal substrate cause significant rearrangement of charges and oxygen vacancies compared to thicker and/or bulk ceria.
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