Títol:
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Surface Refaceting Mechanism on Cubic Ceria
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Autor/a:
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Yang, Chengwu; Capdevila-Cortada, Marçal; Dong, Chunyan; Zhou, Yan; Wang, Junjun; Yu, Xiaojuan; Nefedov, Alexei; Heißler, Stefan; López, Núria; Shen, Wenjie; Wöll, Christof; Wang, Yuemin
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Abstract:
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Polar surfaces of solid oxides are intrinsically unstable and tend to reconstruct due to the diverging electrostatic energy and thus often exhibit unique physical and chemical properties. However, a quantitative description of the restructuring mechanism of these polar surfaces remains challenging. Here we provide an atomic-level picture of the refaceting process that governs the surface polarity compensation of cubic ceria nanoparticles based on the accurate reference data acquired from the well-defined model systems. The combined results from advanced infrared spectroscopy, atomic-resolved transmission electron microscopy, and density functional theory calculations identify a two-step scenario where an initial O-terminated (2 × 2) reconstruction is followed by a severe refaceting via massive mass transport at elevated temperatures to yield {111}-dominated nanopyramids. This significant surface restructuring promotes the redox properties of ceria nanocubes, which account for the enhanced catalytic activity for CO oxidation. |
Data de publicació:
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01-09-2020 |
Matèries:
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54 |
Drets:
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L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/ |
Pàgines:
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7925 p. |
Tipus de document:
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Article Article - Versió acceptada |
DOI:
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doi.org/10.1021/acs.jpclett.0c02409
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