Hydrothermal crystallization and modification of surface hydroxyl groups of anodized TiO2 nanotube-arrays for more efficient photoenergy conversion
Hydrothermal crystallization and modification of surface hydroxyl groups of anodized TiO2 nanotube-arrays for more efficient photoenergy conversion
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DOI：
10.1016/j.electacta.2012.05.157
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发表时间：
2012-09
影响因子：
6.6
通讯作者：
Y. Kuo;T. Li;Jing-Neng Yao;Chiung-Yuan Lin;C. Chien
中科院分区：
文献类型：
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作者：
Y. Kuo;T. Li;Jing-Neng Yao;Chiung-Yuan Lin;C. Chien
采用水热法制备了阳极氧化的TiO 2纳米管阵列。预烧结后的TiO 2纳米管阵列在水热环境下可以进一步晶化而不会发生纳米管的塌陷。采用水热晶化法制备纳米管，通过调节pH值可以控制纳米管表面Ti-O键向Ti-OH/Ti-OH 2键的转变。当水热环境变碱性时，纳米管的溶解和结构转变容易发生。这些效应对羧基在TiO 2纳米管表面的锚定有很大影响，并影响了以水热结晶TiO 2纳米管为光电极的染料敏化太阳能电池的性能.在100 mWcm −2的光照下，光能转换效率从热退火纳米管的6.40%增加到水热结晶纳米管的7.13%。
This paper describes a crystallization method for anodized TiO2nanotube-array using a hydrothermal process. Pre-sintered TiO2nanotube-array could further crystallize without experiencing a collapse of the nanotubes under the hydrothermal environment. Applying the hydrothermal crystallization method, the transition of surface bonds of nanotube from Ti–O to Ti–OH/Ti–OH2can be controlled by acidic hydrothermal pH levels. Dissolution and structural transformation of nanotubes was easily induced if the hydrothermal environment became basic. These effects depicted great influence on the anchoring of carboxylate groups on the surface of TiO2nanotubes and affected the performance of the dye-sensitized solar cell utilizing the hydrothermally crystallized TiO2nanotubes as the photoelectrode. The photoenergy conversion efficiency increased from 6.40% for thermally annealed nanotubes to 7.13% for hydrothermally crystallized ones under illumination of 100mWcm−2.