Metastable Ce-terminated (1 1 1) surface of ceria

Zhao, Yanan; Xing, Wandong; Meng, Fanyan; Sha, Haozhi; Yu, Yunbo; Ma, Xingqiao; Yu, Rong

doi:10.1016/j.apsusc.2021.148972

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…The height of a single O−Ce−O layer is about 0.31 nm. The Ce‐terminated CeO 2 (111) surface is metastable, successfully constructed in nanoparticles, and recently resolved by aberration‐corrected transmission electron microscopy (ACTEM) [22] …”

Section: Ceo2 Model Surfacesmentioning

confidence: 99%

“…The Ce-terminated CeO 2 (111) surface is metastable, successfully constructed in nanoparticles, and recently resolved by aberration-corrected transmission electron microscopy (ACTEM). [22] The ultrathin CeO 2 (111) islands growing on metal surfaces exhibit more appearances because of the interplay with the substrate, which may undergo surface rearrangement due to the strain effect, size effect, or lattice mismatch to the substrate. The Wu group [23] discovered a 3 : 4 coincidence cell of monolayer CeO 2 (Figure 2a), which is a reconstruction induced by the solid electronic interaction with the Pt (111) substrate.…”

Section: Stoichiometric Ceomentioning

confidence: 99%

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Interaction of Water with Ceria Thin Film

Zhou,

Akber,

Zhao

et al. 2023

ChemCatChem

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Water interaction with ceria is a fundamental process underpinning catalytic reactions such as water‐gas‐shift and water electrolysis. This review summarizes the investigations of water interactions with the ceria low‐index surfaces [(111), (100), and (110)]. The first part introduces: (a) The atomic structures of the stoichiometric CeO2 and reduced CeOx (x=1.5∼2) thin films, including the characteristics of oxygen vacancies; (b) The anisotropic migration mechanisms of oxygen vacancies and the locations of the entangled polarons in the reduced ceria. The second part reviews water‘s adsorption, desorption, dissociation, and redox properties on the ceria low‐index surfaces studied by DFT, TPD, XPS, RPES, TEM, and SPM methods. The impacts of water coverage, ceria film thickness, strain effect, dopant effect, face stability, and solid‐liquid interface on the interaction between water and ceria are also discussed. At last, this review sheds some light on the future directions and challenges in this topic.

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Section: Ceo2 Model Surfacesmentioning

confidence: 99%

Section: Stoichiometric Ceomentioning

confidence: 99%

Interaction of Water with Ceria Thin Film

Zhou,

Akber,

Zhao

et al. 2023

ChemCatChem

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“…While the crystallographic coherence domain becomes smaller, all the parameters relax to higher values: the cell constant grows by about 0.2% for specimen Ce200, characterized by very small NPs (~3 nm). This is a well-known nano-structuring effect on oxides in general [39] and nano-CeO 2 in particular [40], which, in the latter case, is attributed either to a significant concentration of Ce 3+ species or to surface structure relaxation [70]. The concomitant increase of the displacement parameters suggests structural disordering in small NPs; with the patterns collected at the same temperature, the increase of U(Ce) and U(O) is attributed to a static contribution to the atomic mean square displacement parameters [71,72], possibly due to surface phenomena.…”

Section: X-ray Powder Diffraction: Bragg-scattering Analysis By Rietv...mentioning

confidence: 95%

Structure and Surface Relaxation of CeO2 Nanoparticles Unveiled by Combining Real and Reciprocal Space Total Scattering Analysis

et al. 2022

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We present a combined real and reciprocal space structural and microstructural characterization of CeO2 nanoparticles (NPs) exhibiting different crystallite sizes; ~3 nm CeO2 NPs were produced by an inverse micellae wet synthetic path and then annealed at different temperatures. X-ray total scattering data were analyzed by combining real-space-based Pair Distribution Function analysis and the reciprocal-space-based Debye Scattering Equation method with atomistic models. Subtle atomic-scale relaxations occur at the nanocrystal surface. The structural analysis was corroborated by ab initio DFT and force field calculations; micro-Raman and electron spin resonance added important insights to the NPs’ defective structure. The combination of the above techniques suggests a core-shell like structure of ultrasmall NPs. These exhibit an expanded outer shell having a defective fluorite structure, while the inner shell is similar to the bulk structure. The presence of partially reduced O−δ2 species testifies to the high surface activity of the NPs. On increasing the annealing temperature, the particle dimensions increase, limiting disorder as a consequence of the progressive surface-to-volume ratio reduction.

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