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True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets

[Image: see text] Combining the advantages of reactive crystal facets and engineering defects is an encouraging way to address the inherent disadvantages of titanium dioxide (TiO(2)) nanocrystals. However, revealing the true photoreactivity origin for defective TiO(2) with coexposed or predominant e...

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Autores principales: Liu, Xiaogang, Du, Guiru, Li, Meng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6751725/
https://www.ncbi.nlm.nih.gov/pubmed/31552330
http://dx.doi.org/10.1021/acsomega.9b01648
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author Liu, Xiaogang
Du, Guiru
Li, Meng
author_facet Liu, Xiaogang
Du, Guiru
Li, Meng
author_sort Liu, Xiaogang
collection PubMed
description [Image: see text] Combining the advantages of reactive crystal facets and engineering defects is an encouraging way to address the inherent disadvantages of titanium dioxide (TiO(2)) nanocrystals. However, revealing the true photoreactivity origin for defective TiO(2) with coexposed or predominant exposed anisotropic facets is still highly challenging. Here, the photoreactivity of TiO(2) nanocrystals with respectively predominant exposed {001}, {101}, and {100} facets before and after Ti(3+) doping under both ultraviolet and visible light was compared systematically. In detail, the photocatalytic H(2) production for R-TiO(2)-001, R-TiO(2)-101, and R-TiO(2)-100 increased by a factor of 1.34, 2.65, and 3.39 under UV light and a factor of 8.90, 13.47, and 8.72 under visible light. By contrast, the photocatalytic degradation of methyl orange for R-TiO(2)-001, R-TiO(2)-101, and R-TiO(2)-100 increased by a factor of 3.18, 1.42, and 2.17 under UV light and a factor of 4.03, 2.85, and 1.58 under visible light, respectively. The true photocatalytic activity origin for the obtained photoreduction and photo-oxidation ability is attributed to the exposure of more active sites (under-coordinated 5-fold Ti atoms), the facilitated charge transfer among {001}, {101}, and {100} facets, and the Ti(3+) energy state with variable doping levels to extend the visible light response. This work hopefully provides significant insights into the photoreactivity origin of defective TiO(2) nanocrystals with anisotropic exposed facets.
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spelling pubmed-67517252019-09-24 True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets Liu, Xiaogang Du, Guiru Li, Meng ACS Omega [Image: see text] Combining the advantages of reactive crystal facets and engineering defects is an encouraging way to address the inherent disadvantages of titanium dioxide (TiO(2)) nanocrystals. However, revealing the true photoreactivity origin for defective TiO(2) with coexposed or predominant exposed anisotropic facets is still highly challenging. Here, the photoreactivity of TiO(2) nanocrystals with respectively predominant exposed {001}, {101}, and {100} facets before and after Ti(3+) doping under both ultraviolet and visible light was compared systematically. In detail, the photocatalytic H(2) production for R-TiO(2)-001, R-TiO(2)-101, and R-TiO(2)-100 increased by a factor of 1.34, 2.65, and 3.39 under UV light and a factor of 8.90, 13.47, and 8.72 under visible light. By contrast, the photocatalytic degradation of methyl orange for R-TiO(2)-001, R-TiO(2)-101, and R-TiO(2)-100 increased by a factor of 3.18, 1.42, and 2.17 under UV light and a factor of 4.03, 2.85, and 1.58 under visible light, respectively. The true photocatalytic activity origin for the obtained photoreduction and photo-oxidation ability is attributed to the exposure of more active sites (under-coordinated 5-fold Ti atoms), the facilitated charge transfer among {001}, {101}, and {100} facets, and the Ti(3+) energy state with variable doping levels to extend the visible light response. This work hopefully provides significant insights into the photoreactivity origin of defective TiO(2) nanocrystals with anisotropic exposed facets. American Chemical Society 2019-09-05 /pmc/articles/PMC6751725/ /pubmed/31552330 http://dx.doi.org/10.1021/acsomega.9b01648 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Liu, Xiaogang
Du, Guiru
Li, Meng
True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title_full True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title_fullStr True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title_full_unstemmed True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title_short True Photoreactivity Origin of Ti(3+)-Doped Anatase TiO(2) Crystals with Respectively Dominated Exposed {001}, {101}, and {100} Facets
title_sort true photoreactivity origin of ti(3+)-doped anatase tio(2) crystals with respectively dominated exposed {001}, {101}, and {100} facets
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6751725/
https://www.ncbi.nlm.nih.gov/pubmed/31552330
http://dx.doi.org/10.1021/acsomega.9b01648
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