Facile Preparation Carbon-Doped TiO2 Nanotube Electrodes and Its Enhanced Photoelectrochemical Response

doi:10.15541/jim20140576

Abstract

Abstract:

Nanostructured carbon-doped titanium dioxide were fabricated by thermal treatment of anodized titanium dioxide nanotube with the presence of NaHCO₃. The resulted samples were characterized via X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra, electrochemical impedance spectroscopy and photoelectrochemistry methods. Anatase type TiO₂ nanotubes and almost no influence from C doping were observed from XRD and SEM results. XPS spectra showed that the O was partly replaced by C in the resulted carbon-doped titanium dioxide nanotubes. Enhanced photocurrents were identified for the C-TiO₂ nanotube and 1.7 times was observed in comparison to the TiO₂. Electrochemical impedance spectroscopy indicates the decrease of charge transfer resistance and flat band potential also negative shift from -0.28 V to -0.38 V. Needle- shaped dye sensitized solar cells were developed by using anodized Ti and Pt wire. Improved photovoltaic performance was demonstrated by the photocurrent density-photovoltage curves for DSSCs when the anodized Ti wire was thermal treated with the presence of NaHCO₃. The short-circuit current and energy conversion efficiency were up to 0.17 mA/cm²and 3.8%, respectively.

Key words: TiO2, anodic oxidation, carbon doping, photoelectrochemistry

CLC Number:

O644

ZHAO Peng, LI Zhong, CUI Xiao-Li. Facile Preparation Carbon-Doped TiO₂ Nanotube Electrodes and Its Enhanced Photoelectrochemical Response[J]. Journal of Inorganic Materials, 2015, 30(6): 599-604.

Figures/Tables 9

Fig. 1 SEM images of TiO2 (a) and C-TiO2 nanotubes (b)

Fig. 2 XRD patterns of TiO2 (a), C-TiO2 (b) and titanium substrate (c)

Fig. 3 XPS spectra of TiO2 (a) and C-TiO2(b) The full-scale XPS spectra (A); high resolution XPS spectra of Cls (B), Ti2p (C), Ols(D)

Fig. 4 UV-Vis diffuse reflectance spectra of TiO2 (a) and C-TiO2 (b) nanotube

Fig. 5 EIS Nyquist (A) and Bode (B) plots for TiO2 (a) and C-TiO2 (b) thin film electrodes at open circuit potential

Fig. 6 Mott-Schottky plots for TiO2 (a) and C-TiO2 (b) nanotube electrodes

Fig. 7 Photocurrent-transient curves of TiO2 (a) and C-TiO2(b) electrodes under UV-Vis (A) and visible light (B) illumination

Fig. 8 Photocurrent density-photovoltage (J-V) curves for needle-shaped DSSCs of TiO2 (a) and C-TiO2 (b) thin film electrodes

Table1 Photovoltaic performances for needle-shaped DSSCs of TiO2 and C-TiO2 thin film electrodes

Cell	V_oc/V	J_sc/(mA•cm^-2)	FF	η /%
TiO₂	0.60	0.08	0.29	1.38%
C-TiO₂	0.72	0.17	0.32	3.82%

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Facile Preparation Carbon-Doped TiO₂ Nanotube Electrodes and Its Enhanced Photoelectrochemical Response

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