高长径比TiO2纳米管阵列的调控制备及其光阳极性能

采用较高粘度的有机溶液作为阳极氧化电解质溶剂制备了TiO₂纳米管阵列. 通过探讨阳极氧化工艺参数对纳米管形貌的影响, 研究出高长径比TiO₂纳米管阵列的制备工艺, 同时对TiO₂纳米管作为染料敏化太阳能电池光阳极的光电性能进行了测试, 并讨论了TiO₂纳米管的形貌对电池性能的影响. 结果表明：提高氧化电压和延长时间有利于获得高长径比纳米管, 在含0.5wt%NH₄F乙二醇电解质中50V氧化17h可制备出长径比为313.6的TiO₂纳米管阵列. TiO₂纳米管(在含0.5wt%NH4F乙二醇电解质中40V氧化13h)作为染料敏化太阳能电池光阳极可得到开路电压为0.723V、短路电流为2.15mA/cm²的光电性能.

Tunable Fabrication of TiO2 Nanotube Arrays with High Aspect Ratio and its Application in Dye Sensitized Solar Cell

TiO₂ nanotube arrays were fabricated by anodization of titanium foils in the viscous nonaqueous electrolytes. Effects of anodization parameters on TiO₂ nanotube were intensively studied. The photo-electrochemical property of dye sensitized solar cell (DSSC) based on TiO₂ nanotube arrays was tested and the influence of TiO₂ nanotube morphology on the performance of DSSC was investigated. The result indicates that the growth of TiO₂ nanotube arrays with high aspect ratio depends highly on the nonaqueous solution which is enhanced by the applied potential and anodizing time. TiO₂ nanotube arrays with aspect ratio up to 313.6 are fabricated in 0.5wt%NH4F in glycerol glycol at 50V for 17h. DSSC based on TiO₂ nanotube arrays (fabricated in 0.5wt%NH₄F in glycerol at 40V for 13h)exhibits an open circuit potential of 0.723V, 2.15mA/cm² short circuit current density.