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

Journal Article


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 perpendicu-

    larly well-aligned TiO2 nanotube (TNT) (up to 21 μm) using

    anodization. Anodizing duration, applied voltage and electro-

    lyte composition influenced the geometry and surface morphol-

    ogies 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) dye- sensitized 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.

UOW Authors


  •   Yun, Jung-Ho (external author)
  •   Ng, Yun Hau (external author)
  •   Ye, Changhui (external author)
  •   Mozer, Attila
  •   Wallace, Gordon
  •   Amal, Rose (external author)

Publication Date


  • 2011

Citation


  • Yun, J., Ng, Y., Ye, C., Mozer, A. J., Wallace, G. G. & Amal, R. (2011). Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application. ACS Applied Materials and Interfaces, 3 (5), 1585-1593.

Scopus Eid


  • 2-s2.0-80052034492

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3117

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 1585

End Page


  • 1593

Volume


  • 3

Issue


  • 5

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 perpendicu-

    larly well-aligned TiO2 nanotube (TNT) (up to 21 μm) using

    anodization. Anodizing duration, applied voltage and electro-

    lyte composition influenced the geometry and surface morphol-

    ogies 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) dye- sensitized 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.

UOW Authors


  •   Yun, Jung-Ho (external author)
  •   Ng, Yun Hau (external author)
  •   Ye, Changhui (external author)
  •   Mozer, Attila
  •   Wallace, Gordon
  •   Amal, Rose (external author)

Publication Date


  • 2011

Citation


  • Yun, J., Ng, Y., Ye, C., Mozer, A. J., Wallace, G. G. & Amal, R. (2011). Sodium fluoride-assisted modulation of anodized TiO2 nanotube for dye-sensitized solar cells application. ACS Applied Materials and Interfaces, 3 (5), 1585-1593.

Scopus Eid


  • 2-s2.0-80052034492

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3117

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 1585

End Page


  • 1593

Volume


  • 3

Issue


  • 5