Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 804, Issue -, Pages 10-17Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.294
Keywords
Ti3+ self-doping; Sulfur-doping; TiO2 nanotube arrays; Synergistic effects; Photoelectrochemical performance
Categories
Funding
- Natural Science Project of Science and Technology Department of Henan Province, China [172102210227]
- School of Materials Science and Engineering of Henan University of Technology
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Titanium dioxide nanotube arrays (TiO2 NTAs) has shown its promising properties for use as a photo-electrode material. However, the efficiency in this regard is restricted by the wide band gap of TiO2. In this study, a facile method was employed to prepare Ti3+ self-doped and sulfur-doped (S-doped) TiO2 NTAs (H-S-TiO2 NTAs). The Ti3+ and S co-doping greatly improved the photoelectrochemical performances of TiO2 NTAs. The optimized H-S-TiO2 NTAs showed obviously red-shifted compared with the optimized TiO2 NTAs. The saturation photocurrent density and the photoelectric conversion efficiency of the optimized H-S-TiO2 NTAs reached 1.97 mA/cm(2) and 1.18%, which were 3.72 and 4.92 times higher than that of the optimized TiO2 NTAs, respectively. Furthermore, the optimized H-S-TiO2 NTAs exhibited the highest transient photocurrent density (1.08 mA/cm(2)) with excellent photoelectric response characteristics, indicating that the transfer efficiently of photogenerated carriers was increased in the optimized H-S-TiO2 NTAs. On the basis of research results, such enhanced performances could prove that the Ti3+ self-doping and S-doping had synergistic effects. The established S-doping as well as introduced Ti3+ self-doping of TiO2 NTAs resulted in enhanced visible-light absorption and rapid electron transfer rate. (C) 2019 Elsevier B.V. All rights reserved.
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