Journal
APPLIED SURFACE SCIENCE
Volume 499, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143866
Keywords
DFT calculations; Adsorption energy; Oxygen chemistry; NO oxidation; Ce doping
Categories
Funding
- High-end Talent Team Construction Foundation [108-10000318]
- Natural Science Foundation of Shandong, China [ZR201808030032]
- High-end Talent Introduction two-hundred plans Foundation of Yantai
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The catalytic oxidation of NO on the undoped and Ce-doped LaCoO3 (011) surfaces has been systematically studied by utilizing the density functional theory (DFT) method. The extra-lattice oxygen and Mars-van Krevelen (MvK) mechanisms of NO oxidation are considered. According to our calculations, the extra-lattice oxygen mechanism is more likely to occur on the undoped and Ce-doped LaO-terminated LaCoO3 (011) surfaces, while the MvK mechanism is more suitable for the undoped and Ce-doped CoO2 -terminated LaCoO3 (011) surfaces. By comparing and analyzing the same NO oxidation pathway on the undoped and Ce-doped surfaces, it is proved that the Ce doping is favorable for the LaO-terminated LaCoO3 (011) surface, but harmful for the CoO2-terminated LaCoO3 (011) surface. In our research on NO oxidation, the addition of Ce dopant contributes to the LaO-terminated LaCoO3 (011) surface by reducing the energy barriers of O-2 dissociation and NO2 desorption.
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