Journal
NANOSCALE
Volume 6, Issue 17, Pages 10216-10223Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr02677b
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Funding
- National Natural Science Foundation of China [21301166, 21201159, 61306081, 61176016]
- Science and Technology Department of Jilin Province [20130522127JH, 20121801]
- Returnee startup fund of Jilin
- Hundred Talent Program of CAS
- National Science Foundation [CHE-1213795]
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Colored TiO2 has attracted enormous attention due to its visible light absorption and excellent photocatalytic activity. In this report, we develop a simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 at mild temperature (300-350 degrees C). The obtained sample possesses a crystalline core/amorphous shell structure (TiO2@TiO2-x). The oxygen vacancy results in the formation of a disordered TiO2-x shell on the surface of TiO2 nanocrystals. XPS and theoretical calculation results indicate that valence band tail and vacancy band below the conduction band minimum appear for the TiO2-x, which implies that the TiO2@TiO2-x nanocrystal has a narrow band gap and therefore leads to a broad visible light absorption. Oxygen vacancy in a proper concentration promotes the charge separation of photogenerated carriers, which improves the photocatalytic activity of TiO2@TiO2-x nanocrystals. This facile and general method could be potentially used for large scale production of colored TiO2 with remarkable enhancement in the visible light absorption and solar-driven H-2 production.
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