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

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Title
Site-selective doping mechanisms for the enhanced photocatalytic activity of tin oxide nanoparticles
Author(s)
Woo-Sung Jang; Jin, Yeongrok; Kim, Young-Hoon; Yang, Sang-Hyeok; Kim, Seon Je; Hong, Jung A.; Baik, Jaeyoon; Lee, Jaekwang; Lee, Hangil; Young-Min Kim
Publication Date
2022-05
Journal
Applied Catalysis B: Environmental, v.305
Publisher
Elsevier B.V.
Abstract
© 2022 Elsevier B.V.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.
URI
https://pr.ibs.re.kr/handle/8788114/11533
DOI
10.1016/j.apcatb.2022.121083
ISSN
0926-3373
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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