Microstructure, optical and optoelectrical properties of mesoporous nc-TiO2 films by hydrolysis-limited sol-gel process with different inhibitors
Microstructure, optical and optoelectrical properties of mesoporous nc-TiO2 films by hydrolysis-limited sol-gel process with different inhibitors
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DOI：
10.1016/j.tsf.2009.02.030
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发表时间：
2009-08-03
期刊：
影响因子：
2.1
通讯作者：
Wang, Tao
中科院分区：
文献类型：
--
作者：
Fu, Yanan;Jin, Zhengguo;Wang, Tao
以聚环氧烷嵌段共聚物为模板、原钛酸四丁酯为钛源，采用溶胶-凝胶法合成了介孔纳米晶二氧化钛（nc-TiO2）薄膜。研究了乙酰丙酮 (AcAc)、冰醋酸、H2O 和 AcAc-HCl 作为抑制剂对水解/缩合反应的影响。通过N-2吸附、X射线衍射、透射电子显微镜和UV-VIS-NIR光谱分析了介孔结构、晶相和光学特性。使用介孔 nc-TiO2 作为光阳极在染料敏化太阳能电池 (DSSC) 上进行光作用测量。结果表明，所形成的薄膜为锐钛矿相，具有介孔结构。这些抑制剂对水解/缩合过程的不同抑制机制导致不同的介孔结构，其比表面积(S-BET)在34至176 m(2)/g之间变化，晶体尺寸在5.6至38.2 nm之间。具有高 S-BET 和大晶粒的介孔光电阳极可能是提高 DSSC 转换效率的原因。 (C) 2009 年由 Elsevier B.V 出版
Mesoporous nanocrystalline titania (nc-TiO2) films were synthesized by sol-gel route using poly (alkylene oxide) block copolymer as template and tetrabutyl orthotitanate as titanium source. Influence of acetylacetone (AcAc), glacial acetic acid, HO and AcAc-HCl as inhibitors on hydrolysis/condensation reaction was investigated. The mesopore structure, crystalline phase and optical characteristics were analyzed by N-2 adsorption, X-ray diffraction, transmission electron microscopy and UV-VIS-NIR spectrum. Photoaction measurements were performed on dye-sensitized solar cells (DSSCs) using the mesoporous nc-TiO2 as photoanodes. The results show that the formed films are anatase phase and mesoporous structure. Different restraining mechanisms of these inhibitors to hydrolysis/condensation process lead to different mesoporous structure whose specific surface area (S-BET) varies from 34 to 176 m(2)/g, and crystal size is from 5.6 to 38.2 nm. The mesoporous photoanode with high S-BET and large crystalline grains may be responsible for increasing conversion efficiency of the DSSCs. (C) 2009 Published by Elsevier B.V