基于二氧化钛纳米管的染料敏化电池光阳极研究

TiO_2 Nanotube Based Dye-sensitized Photoanode

本文报道了一种基于二氧化钛(TiO2)纳米管的染料敏化太阳能电池。用二次阳极氧化法在钛箔上生长出高度有序的TiO2纳米管薄膜,然后将完整剥落的纳米管薄膜结合TiO2纳米颗粒的浆料转移到掺杂氟的SnO2透明导电玻璃(FTO)基底上,从而获得一种特殊的染料敏化光阳极。对比了不同长度的TiO2纳米管的电池性能,发现经TiCl4处理长度为32.8μm的TiO2纳米管对应的电池表现较好的光电转换效率,达到4.15%。通过X射线衍射分析了高温退火对纳米管晶化结构的影响。电化学阻抗谱分析表明:光电子传输对光阳极纳米管层厚依赖性强,随着纳米管长度的增长,界面电阻呈明显的减小,这一结果对于理解和进一步改善染料敏化电池光阳极内部电子输运过程具有重要意义。

A front-illuminated TiO2 nanotube-based dye-sensitized solar-cell （DSC） was presented. Highly ordered TiO2 nanotube membranes were fabricated by two-step anodic oxidation of Ti foil, and then they were transferred to fluorine-doped tin oxide glass substrates to produce a special kind of photoanode. A series of comparison were made between DSCs with different length of nanotubes. Front-illuminated DSC with 32.8 ~tm nanotube membrane showed an efficiency of 4.15% with TIC14 treatment. The crystal phase evolution of the TiO2 nanotubes was re- searched using X-Ray Diffraction （XRD）. Electrochemical Impedance Spectra （EIS） results indicated that the elec- tron transportation efficiency had a strong dependence on the thickness of photoanode, and interfacial resistances decreased with the increasing of nanotubes length. These results could help us to understand the mechanism of the electron transportation and further improve the photoanode of DSCs.