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• W3145732379 abstract "Small cluster and periodic surface models with low coverages of intermediates are frequently employed to investigate reaction mechanisms and identify active sites on nanoparticles (NPs) in density functional theory (DFT) studies. However, diverse active sites on NPs cannot be sufficiently represented by these simple models, hampering the in-depth insights into the catalytic behavior of NPs. This paper describes the crucial roles of both model and coverage effect on understanding the nature of active sites for CO 2 reduction over Au and Pd NPs using DFT calculations. Terrace sites exhibit higher selectivity for CO than edge sites on Au NPs, which is opposite to the results on Au periodic surfaces. This contradiction reveals the computational model effect on clarifying active site properties. For Pd catalysts, the coverage effect is more significant. On bare Pd NPs and periodic surfaces, the selectivity for CO at edge sites is nearly identical to that at terrace sites, whereas edge sites display higher selectivity for CO than terrace sites in the case of high CO coverages. Through considering the more realistic models and the coverage effect, we successfully describe the size effect of Au and Pd NPs on CO selectivity. More importantly, this work reminds us of the necessity of reasonable models in DFT calculations. The realistic nanoparticle models and coverage effects play critical roles in understanding the properties of active sites on Au and Pd nanoparticles and revealing the size effect on the selectivity of CO 2 reduction to CO." @default.
• W3145732379 created "2021-04-13" @default.
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• W3145732379 date "2021-05-01" @default.
• W3145732379 modified "2023-10-17" @default.
• W3145732379 title "Reveal the nature of particle size effect for CO2 reduction over Pd and Au" @default.
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• W3145732379 doi "https://doi.org/10.1016/s1872-2067(20)63692-0" @default.
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