Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application

Yun, Jung-Ho, Ng, Yun Hau, Ye, Changhui, Mozer, Attila J., Wallace, Gordon G. and Amal, Rose (2011) Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application. ACS Applied Materials and Interfaces, 3 5: 1585-1593. doi:10.1021/am200147b


Author Yun, Jung-Ho
Ng, Yun Hau
Ye, Changhui
Mozer, Attila J.
Wallace, Gordon G.
Amal, Rose
Title Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application
Formatted title
Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application
Journal name ACS Applied Materials and Interfaces   Check publisher's open access policy
ISSN 1944-8244
1944-8252
Publication date 2011-05-11
Year available 2011
Sub-type Article (original research)
DOI 10.1021/am200147b
Open Access Status Not Open Access
Volume 3
Issue 5
Start page 1585
End page 1593
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
This work reports the use of sodium fluoride (in ethylene glycol electrolyte) as the replacement of hydrofluoric acid and ammonium fluoride to fabricate long and perpendicularly well-aligned TiO2 nanotube (TNT) (up to 21 μm) using anodization. Anodizing duration, applied voltage and electrolyte composition influenced the geometry and surface morphologies of TNT. The growth mechanism of TNT is interpreted by analyzing the current transient profile and the total charge density generated during anodization. The system with low water content (2 wt %) yielded a membrane-like mesoporous TiO2 film, whereas high anodizing voltage (70 V) resulted in the unstable film of TNT arrays. An optimized condition using 5 wt % water content and 60 V of anodizing voltage gave a stable array of nanotube with controllable length and pore diameter. Upon photoexcitation,TNTs synthesized under this condition exhibited a slower charge recombination rate as nanotube length increased. When made into cis-diisothiocyanato-bis(2,2'-bipyridyl-4,4'- dicarboxylato) ruthenium(II) bis (tetrabutyl-ammonium)(N719) dyesensitized solar cells, good device efficiency at 3.33 % based on the optimized TNT arrays was achieved with longer electron time compared with most mesoporous TiO2 films.
Keyword Anodization
Dye-sensitized solar cell
Photoelectrochemistry
Sodium fluoride
Well-aligned TiO2 nanotube
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Mon, 27 Jun 2016, 15:23:14 EST by Jung Ho Yun on behalf of Learning and Research Services (UQ Library)