https://scholars.lib.ntu.edu.tw/handle/123456789/408666
Title: | Double-Wall TiO 2 Nanotubes for Dye-Sensitized Solar Cells: A Study of Growth Mechanism | Authors: | Chen W.-C. Yeh M.-H. Lin L.-Y. Vittal R. Ho K.-C. |
Keywords: | Anodization;Double-wall TiO 2 nanotubes;Dye-sensitized solar cell;Electrochemical impedance spectroscopy;Flexible photoanode;Incident photon-to-electron conversion efficiency | Issue Date: | 2018 | Journal Volume: | 6 | Journal Issue: | 3 | Start page/Pages: | 3907-3915 | Source: | ACS Sustainable Chemistry and Engineering | Abstract: | One-dimensional TiO 2 nanotubes (TNTs) are promising semiconductor photoanodes for dye-sensitized solar cells (DSSCs) due to their rapid electron transportation property; however, the lack of high surface area restricts their application. Double-wall TiO 2 nanotubes (DWTNTs) were synthesized to compensate for the smaller surface area of single-wall TiO 2 nanotubes (SWTNTs) and the comprehensive growth mechanism of DWTNTs is clearly demonstrated in this study. The evolution of pores and pits in three dimensions causes the formation of DWTNTs. After optimizing the thickness of DWTNTs, the DSSC with DWTNTs on the flexible Ti substrate showed a higher power conversion efficiency (£b) of 6.90 ¡Ó 0.10%, as compared to that of the cell with SWTNTs (4.66 ¡Ó 0.15%), owing to a significant increase in the short-circuit photocurrent density caused by the higher surface area for dye adsorption for the former case. Electrochemical impedance spectroscopy, incident photon-to-electron conversion efficiency curves, and UV-vis absorption spectra were conducted to sustain the explanations. ? Copyright ? 2018 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408666 | ISSN: | 21680485 | DOI: | 10.1021/acssuschemeng.7b04250 |
Appears in Collections: | 化學工程學系 |
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