硼摻雜之二氧化鈦奈米管應用於水分解製氫及染料敏化太陽能電池

Abstract

本篇論文研究目的為使用簡易的電化學陽極氧化法合成二氧化鈦奈米管，同時摻雜硼原子；並且製作成元件應用在光分解水製氫系統以及染料敏化太陽能電池。其中陽極氧化條件、硼之摻雜量，和使用TiCl4水溶液與InN粒子修飾二氧化鈦奈米管也是我們探討的重點，期望藉此提升光轉換效率。而摻雜硼原子前後之特性我們將以SEM、EPMA、XRD、UV-VIS以及XPS圖譜分析。 在光分解水製氫系統方面，研究結果顯示最佳之光分解水轉換效率是在外加電壓為60 V下成長30分鐘的二氧化鈦奈米管(孔洞139 nm和管長13.3 )；而摻雜0.8 wt. % NH4BF4之二氧化鈦奈米管可將未摻雜硼的光轉換效率各別從14.1%( 的紫外光區 和0.048% 的可見光區 提升至31.3%及0.099%。 應用在DSSC上，摻雜0.9 wt. % NH4BF4之二氧化鈦奈米管可將未摻雜硼之轉換效率從5.38%增加到5.79%。若以InN奈米粒子修飾摻雜硼後的二氧化鈦奈米管，可將效率由5.79%提升至6.38%，相對增加了10.19%。

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.