CeO2(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach

Title
CeO2(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach
Authors
김진영Robin Lawler조진원함형철주현철이승우최지일장승순
Issue Date
2020-09
Publisher
The Journal of Physical Chemistry C
Citation
VOL 124, NO 38-20959
Abstract
?OOH binding energy = ?2.80 eV). This is likely due to Coulombic repulsive interaction from the additional oxygen atom adjacent to the linear defect. This is also potentially due to the greater localization of electrons to defect-adjacent cerium atoms in the triangular defect, as demonstrated via a Mulliken population analysis. Confirming this observation, it is shown that the density of states (DOS) for the Ce 4f band undergoes a significant alteration near the Fermi level due to this electron localization. As such, it is demonstrated that the triangular defect possesses a superior radical scavenging capability compared to the linear defect. Based on the results of this study, we suggest that future experimental studies aim to synthesize ceria nanoparticles with a greater percentage of triangular defects to enhance the particle radical scavenging capability.; CeO2 has been established as an effective scavenger for destructive oxygen radicals in fuel cell membranes. The effect of ceria (CeO2) surface defect on ?OH and ?OOH radical scavenging efficacy is investigated using density functional theory (DFT). Our calculations suggest that both ?OH and ?OOH can be bound to oxygen vacancies on the CeO2(111) surface. Intriguingly, binding to the triangular defect (?OH binding energy = ?4.54 eV; ?OOH binding energy = ?3.20 eV) is more favorable than binding to the linear defect (?OH binding energy = ?4.12 eV
URI
http://pubs.kist.re.kr/handle/201004/72026
ISSN
1932-7447
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KIST Publication > Article
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