| Summary: | 碩士 === 國立交通大學 === 應用化學研究所 === 98 === In this study, we use a facile electrochemical anodization method to prepare undoped TiO2 nanotubes and B-doped TiO2 nanotubes for water splitting and dye-sensitized solar cell applications. We vary the anodization conditions, different NH4BF4 concentrations and TiO2 nanotubes posttreatments with TiCl4 solution and InN nanoparticles. All samples were characterized by SEM, EPMA, XRD, UV-VIS and XPS analyses.
The best anodization condition based on hydrogen generation by water splitting is 60 V applied potential with 30 min anodization time (139 nm tube diameter and 13.3 tube length). B-doping was noted to increase the water-splitting efficiency from 14.1% ( in the UV region) and 0.048% ( in the visible region) with undoped TiO2 nanotubes to 31.3% and 0.099% with B-doped TiO2 nanotubes (using an electrolyte containing 0.8 wt. % NH4BF4), respectively.
In dye-sensitized solar cells using N3 dye, the efficiency was found to increase from 5.38% with undoped TiO2 nanotubes to 5.79% with B-doped TiO2 nanotubes (using an electrolyte containing 0.9 wt. % NH4BF4). When InN nanoparicles were deposited on the nanotubes to modify B-doped TiO2 nanotubes (using an electrolyte containing 0.9 wt. % NH4BF4) the efficiency was increased to 6.38%, with a 10% relative enhacement.
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