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• W2090130189 abstract "Abstract The defect-induced “black-and-white” issue of TiO 2 keeps this material under spotlight in the past decade. This work exhibits an oxidation-based synthesis of anatase TiO 2 nanocrystals with various Ti 3+ concentrations via a solvothermal process in combination with post-annealing at different temperatures. Strikingly, we found that by simply controlling the annealing temperature, both concentration and location of the Ti 3+ defects can be well managed to reside predominately in the subsurface/bulk regions of the post-annealed anatase TiO 2 nanocrystals, a highly desired feature for stable visible light-active photocatalysis. The location and quantity of the Ti 3+ in anatase nanocrystals pinpointed by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) suggest that this temperature-mediated management of the location and concentration of Ti 3+ defects is achieved through a Ti 3+ reversible-diffusion mechanism. As an applicable verification, the sample attained by post-annealing treatment at 500 °C, which has the highest Ti 3+ concentration predominately in the bulk region, exhibits a 30-fold enhancement in visible-light decomposition of methylene blue and 4 times improvement in the maximal transient photocurrent density compared with P25. This work reveals that managing the location and concentration of Ti 3+ defects in TiO 2 is a decisive process toward defects-induced visible-light photocatalysis." @default.
• W2090130189 created "2016-06-24" @default.
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• W2090130189 date "2015-10-01" @default.
• W2090130189 modified "2023-10-17" @default.
• W2090130189 title "Management on the location and concentration of Ti3+ in anatase TiO2 for defects-induced visible-light photocatalysis" @default.
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• W2090130189 doi "https://doi.org/10.1016/j.apcatb.2015.04.016" @default.
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