A mechanism for the formation of annealed compact oxide layers at the interface between anodic titania nanotube arrays and Ti foil

Chen, Chien-Chon; Say, Wen C.; Hsieh, Sheng‐Jen; Diau, Eric Wei‐Guang

doi:10.1007/s00339-009-5093-6

Cited by 24 publications

(20 citation statements)

References 26 publications

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“…The intense diffuse halo and the absence of diffraction peaks clearly demonstrates that the nanotubular titanium dioxide layer is amorphous. This result agrees satisfactorily with independent studies [19][20][21] . Figure 6 shows diffuse reflectance spectra DRS of the nanotubular TiO 2 layer and the Degussa P25 TiO 2 nanopowder.…”

Section: Resultssupporting

confidence: 93%

Nonstoichiometric titanium dioxide nanotubes with enhanced catalytical activity under visible light

Валеева

Kozlova

Вохминцев

et al. 2018

Sci Rep

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The catalytic activity of nanotubular titanium dioxide films formed during the oxidation of acetone to carbon dioxide under the action of visible light with a wavelength of 450 nm was found to be approximately 2 times higher compared to standard titanium dioxide (Degussa P25). The nanotubular films were grown by the anodization of titanium foil using an original technique. Diffuse reflectance spectra of the films are attributed to enhanced activity in the visible spectrum by the nonstoichiometry of titanium dioxide near the interface between the nanotubular film and the titanium foil substrate.

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Section: Resultssupporting

confidence: 93%

Nonstoichiometric titanium dioxide nanotubes with enhanced catalytical activity under visible light

Валеева

Kozlova

Вохминцев

et al. 2018

Sci Rep

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“…The NT-based DSCs achieved an efficiency of h ¼ 6.01% with short circuit current density J sc ¼ 12.79 mA/cm 2 , open circuit voltage V oc ¼ 0.765 V and fill factor FF ¼ 61.4%. Our NT based DSCs outperformed the similar devices recently fabricated by Zhu et al [10,11], Fabregat-Santiago et al [17], and Jennings et al [20] (h ¼ 3-4%), and are comparable with the cells reported by Chen et al [7][8][9]. Our highly efficient NTbased DSCs will be beneficial for clarifying the influence of differences in the nanostructure on the photovoltaic performance of the DSCs.…”

Section: Photovoltaic Characterizationsupporting

confidence: 82%

“…Crystallite size and strain were then derived by Rietveld refinement. The efficiency of our DSCs based on these NT titania typically exceeds 6% under standard test conditions (STC: AM1.5, 100 mW/cm 2 , T ¼ 25 C) and thus is compatible to the highest efficiencies reported in the literature [7][8][9]. The main topic of this work is to gain a deeper insight into electron kinetics in NT electrodes in comparison with NP-electrodes by electrochemical impedance spectroscopy (EIS).…”

Section: Introductionsupporting

confidence: 73%

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Fast charge transport of titania nanotube arrays in dye-sensitized solar cells

Xie

Adams³

2010

Zeitschrift Für Kristallographie - Crystalline Materials

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Nanotube / Dye-senstized solar cell / Rietveld refinement / Electrochemical impedance spectroscopy Abstract. Vertically oriented nanotubular titania arrays with a length of ca. 12 mm were fabricated by anodisation of titanium foils. Rietveld refinements of grazing incidence and wide angle XRD patterns for the annealed nanotube titania array showed that they consist of anatase crystals with a pronounced size anisotropy and a moderate preferred orientation. The energy conversion efficiency of dye sensitized solar cells based on the annealed nanotubular anatase array exceeds 6% under standard AM1.5 100 mW/cm 2 irradiance and thus outperforms solar cells based on anatase nanoparticles when comparing analogous back illumination cell designs. Electrochemical impedance spectroscopy was employed to clarify the origin of the improved short circuit current and conversion efficiency. It was found that the effective diffusion length in the nanotube cells reaches >100 mm and no longer limits the conversion efficiency. The faster electron transport can be traced back to the larger crystallite size and the reduced intergrain orientation mismatch in the titania nanotubes.

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“…We have also made TiO 2 NT film [32][33][34][35][36] and used it for DSSC device fabrication, allowing the photovoltaic power conversion efficiency to reach η ∼7% [14,37]. In this paper, we have combined our previous Al 2 O 3 template, TiO 2 NT, and DSSC fabrication technologies to achieve an Al 2 O 3 /TiO 2 NT-DSSC device.…”

Section: Introductionmentioning

confidence: 99%

Alumina Template Assistance in Titania Nanotubes Dye-Sensitized Solar Cell ( NT-DSSC) Device Fabrication

Yang

Chen

2012

ISRN Nanotechnology

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In our previous works, we have made alumina template films and used it for nanowire, nanowhisk, and nanosphere fabrication and molecular aggregation studies. In the present paper, we have combined Al 2 O 3 template and titania (TiO 2 ) NT fabrication processes to achieve an Al 2 O 3 /TiO 2 NT dye-sensitized solar cell (DSSC) devices. The DSSC structure includes glass substrate, transparent conductive film of ITO, Pt particles serving as the counter electrode, Al 2 O 3 /TiO 2 NT film, dye, and ITO serving as the working electrode, and the electrolyte is injected into the counter-working interface. Al 2 O 3 template was made by anodization and TiO 2 NT was made by sol-gel deposition into Al 2 O 3 template. Al 2 O 3 template has a light, transparence, large surface, good mechanical strength, and flexibility, making it a candidate material for DSSC electrode template. TiO 2 NT is a semiconductor with an energy gap that matches up very nicely with N3 sensitized dye.

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A mechanism for the formation of annealed compact oxide layers at the interface between anodic titania nanotube arrays and Ti foil

Cited by 24 publications

References 26 publications

Nonstoichiometric titanium dioxide nanotubes with enhanced catalytical activity under visible light

Nonstoichiometric titanium dioxide nanotubes with enhanced catalytical activity under visible light

Fast charge transport of titania nanotube arrays in dye-sensitized solar cells

Alumina Template Assistance in Titania Nanotubes Dye-Sensitized Solar Cell ( NT-DSSC) Device Fabrication

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