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Site-selective doping mechanisms for the enhanced photocatalytic activity of tin oxide nanoparticles

Authors
Jang, W.-S.Jin, Y.Kim, Y.-H.Yang, S.-H.Kim, S.J.Hong, J.A.Baik, J.Lee, J.Lee, H.Kim, Y.-M.
Issue Date
May-2022
Publisher
Elsevier B.V.
Keywords
Atomic defect; Doping; Lattice strain; Metal oxide nanoparticle; Oxygen vacancy
Citation
Applied Catalysis B: Environmental, v.305, pp.1 - 10
Journal Title
Applied Catalysis B: Environmental
Volume
305
Start Page
1
End Page
10
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151316
DOI
10.1016/j.apcatb.2022.121083
ISSN
0926-3373
Abstract
The addition of transition metal dopants into metal oxide nanoparticles (MO NPs) is an universal strategy to engineer the electronic and chemical properties of NPs. Although doping phenomena strongly rely on interactions with compositional and electronic degrees of freedom, fully understanding the site-specific doping behavior in the lattice framework of MO NP on atomic scale remains challenging. Here, we directly resolve the atomic site-selective (substitutional or interstitial) doping behaviors of Cr and Fe in SnO2, revealing their different roles in photocatalytic activities. Atomic-resolution microscopy combined with spectroscopy reveals two contrasting doping behaviors: Cr3+ substitutes for Sn4+ associated with the formation of oxygen vacancies, whereas Fe3+ occupies interstitial sites accompanied by lattice strain. Theoretical calculations indicate that substitutional dopant-vacancy cooperation and interstitial dopant-strain coupling can be energetically favorable routes for enhancing catalytic properties. Our results provide fundamental insights into atomic-scale doping mechanisms and engineering strategies for high-performance doped MO NPs. © 2022 Elsevier B.V.
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