Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 31, Pages 14183-14192Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.06.031
Keywords
Ti-Si alloy; Si-doped TiO2 nanotubes; NaBH4 reduction; Ti3+/oxygen vacancy; PEC water splitting
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Funding
- National Natural Science Foundation of China [51572170]
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Photoelectrochemical (PEC) water splitting based on doping-modified one-dimensional (1D) TiO2 is a promising approach to sustainable hydrogen evolution. Here we successfully fabricated high-efficiency reduced Ti-Si-O nanotubes photoanode through anodizing two-phase Ti Si alloy and one step NaBH4 reduction, and investigated its PEC water splitting properties. It was found that Si-doped TiO2 nanotubes mainly grew at the alpha-Ti region of Ti-5Si alloy substrate, and they easily dissolved at the Ti5Si3 phase region of the alloy. Both Si element and Ti3+/oxygen vacancy (V-o) were successfully doped into the oxide nanotubes, resulting in enhanced optical absorption and facilitated separation of photogenerated electron-hole pairs. The reduced Ti-Si-O nanotubes photoanode with co-doped Si element and Ti3+/V-o could have a high photocurrent density of 1.39 mA/cm(2) at 0 V vs. Ag/AgCl. The solar to hydrogen efficiency could reach 0.88% and it was 4.89 times that of undoped TiO2. It demonstrated that co-doping of Si and Ti3+/V-o shows great potential in improving the PEC water splitting properties of undoped TiO2. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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