標題: Hydrothermal crystallization and modification of surface hydroxyl groups of anodized TiO2 nanotube-arrays for more efficient photoenergy conversion
作者: Kuo, Yu-Yen
Li, Tze-Huei
Yao, Jing-Neng
Lin, Chiung-Yuan
Chien, Chao-Hsin
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: TiO2 nanotube;Hydrothermal;Crystallization;Dye-sensitized solar cells;Hydroxyl group
公開日期: 1-九月-2012
摘要: This paper describes a crystallization method for anodized TiO2 nanotube-array using a hydrothermal process. Pre-sintered TiO2 nanotube-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-OH2 can 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 TiO2 nanotubes and affected the performance of the dye-sensitized solar cell utilizing the hydrothermally crystallized TiO2 nanotubes 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 100 rnW cm(-2). (C) 2012 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.electacta.2012.05.157
http://hdl.handle.net/11536/16873
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2012.05.157
期刊: ELECTROCHIMICA ACTA
Volume: 78
Issue: 
起始頁: 236
結束頁: 243
顯示於類別:期刊論文


文件中的檔案:

  1. 000308259500032.pdf