Influence of geometric and electronic characteristics of TiO2 electrodes with nanotubular array on their photocatalytic efficiencies

Atyaoui, Atef; Bousselmi, Latifa; Cachet, H.; Pu, Peiyu; Sutter, Éliane

doi:10.1016/j.jphotochem.2011.09.009

Cited by 21 publications

(14 citation statements)

References 42 publications

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“…Actually, the influence of initial titanium purity was not studied since a high‐purity titanium substrate with an appropriate flat surface is generally used in order to obtain pure and homogenous titania oxide on the surface. Indeed, it was demonstrated in many studies, like our previous study, that smooth and well‐uniform titania nanoutubes layers show higher photocatalytic activity than rough and non uniform layers.…”

Section: Methodsmentioning

confidence: 50%

“…Three kinds of TiO 2 nanotube arrays films were made by anodic oxidation of a titanium rod (2 mm thickness, 15 mm diameter, 99.6% purity), at three different anodization voltages (20 V, 40 V and 60 V), during 45 min, in ethylene glycol containing 3 wt% NH 4 F and 2 vol% H 2 O, the electrolyte leading to TNT films with a high photoactivity in our previous study . The anodization was carried out using a DC power source in a two‐electrode cell, where a Pt foil served as the counter electrode and a titanium sheet was used as the working electrode.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study, the influence of geometric and electronic characteristics of TNT array, obtained in three different electrolytes, on their photocatalytic efficiencies was evidenced. The titania nanotube electrodes prepared in ethylene glycol (NT1) were found to show a higher photocurrent, and a higher activity for pollutant degradation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Atyaoui

Cachet

Sutter

et al. 2013

Surface & Interface Analysis

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This work compares the behaviors of TiO2 nanotube (TNTs) array obtained by anodization of Ti foils in an ethylene glycol/NH4F/water electrolyte with different applied voltages during a constant anodization time, and for the same electrolyte composition. The crystal structure and surface morphology of the annealed anodic films are investigated by X‐Ray diffraction system, Raman spectroscopy and scanning electron microscopy, respectively. The TiO2 nanotubes obtained at potentials of 20–40–60 V show different inner diameters (42–89–124 nm), tube length (1.2–3.3–12.7 µm) and wall thicknesses (12–15–18 nm). The influence of these geometric parameters on the photoelectrochemical properties and the photocatalytic activity were investigated in detail. The results showed that the photocatalytic performances of TNT films are improved when the specific surface, the tube length and the solid fraction are increased, but the increase is slowed down when a limiting thickness of the layer is reached. The surface states which usually show high density in nanostructured layers do not seem to influence significantly the photocatalytic activity of the layers. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 50%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Atyaoui

Cachet

Sutter

et al. 2013

Surface & Interface Analysis

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“…The outstanding charge transport of TiO 2 nanotubes enables various advanced applications, such as in sensors [5][6][7], dyesensitised solar cells [8][9][10], photocatalysis [11][12][13] and water photo-electrolysis [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Relation between morphology and conductivity in TiO2 nanotube arrays: an electrochemical impedance spectrometric investigation

Cachet

Ngaboyamahina

et al. 2012

J Solid State Electrochem

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International audienceTwo types of TiO2 nanotubular arrays were obtained by anodisation of a titanium foil, in two different solutions containing fluoride ions. For the first type which has rough tube walls, impedance measurements in the dark showed the presence of a localised surface state which was related to adsorbed molecular water. Under UV illumination, this adsorbed molecular water was photo-dissociated. Moreover, an increase of 2 orders of magnitude for the limiting capacitance of the space charge layer was observed, simultaneously with the disappearance of the localised state and with a 100-time increase of the carrier density associated with hydrogen insertion. The second type of layer was characterised by smoother tube walls, a high doping level (1020 cm−3) in the dark, a lack of localised states and no long-lasting photo-induced effect. In this case, the width of the space charge layer became rapidly higher than the half-thickness of the tube walls, when the applied potential increased. Therefore, the walls were progressively depleted under anodic polarisation, passing from a situation where the tubes were totally active in the cathodic range towards a situation where the contribution of the tube walls could be neglected

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“…In this context, various advanced oxidations processes such as photocatalytic degradation [3], electrocoagulation [4], and ozonation [5] are used for treating textile wastewater. Anodic oxidation (AO) is attracting more and more attention as efficient methods to remove toxic organic compounds from wastewater [6] and textile effluents [7].…”

Section: Introductionmentioning

confidence: 99%

Interface behavior of PbO₂on pure lead and stainless steel as anode for dye degradation

Elaissaoui

Akrout

Bousselmi

2015

Desalination and Water Treatment

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A B S T R A C TPbO 2 films are electrodeposited by the galvanostatic (G) and pulsed current (P) methods on lead and stainless steel (AS30), respectively. They are used as electrodes for electrochemical degradation of Amaranth dye. The scanning electron microscope, atomic force microscope, and X-ray diffraction analyses revealed the dominance of β-PbO 2 form in two anodes and the absence of the form tet-PbO and PbSO 4 in AS30 substrate that have more amorphous shape and less roughness (200 nm). A poor lead oxide adhesion on AS30 substrate is detected. Cyclic voltammetry results showed that the absence of oxidation peak in the case of AS30/PbO 2 anode is related to the oxidation of PbSO 4 to β-PbO 2 . EIS results demonstrated that the pH influences largely PbO 2 layer. Concerning E123 degradation, 95 and 91% of color removal (82 and 76% of Chemical oxygen demand removals) were achieved using Pb/PbO 2 and AS30/PbO 2 anodes, respectively. In this case, current efficiency has kept relatively a high value assuming less energy consumption.

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Influence of geometric and electronic characteristics of TiO2 electrodes with nanotubular array on their photocatalytic efficiencies

Cited by 21 publications

References 42 publications

Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Relation between morphology and conductivity in TiO2 nanotube arrays: an electrochemical impedance spectrometric investigation

Interface behavior of PbO₂on pure lead and stainless steel as anode for dye degradation

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Influence of geometric and electronic characteristics of TiO2 electrodes with nanotubular array on their photocatalytic efficiencies

Cited by 21 publications

References 42 publications

Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Effect of the anodization voltage on the dimensions and photoactivity of titania nanotubes arrays

Relation between morphology and conductivity in TiO2 nanotube arrays: an electrochemical impedance spectrometric investigation

Interface behavior of PbO2on pure lead and stainless steel as anode for dye degradation

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Product

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Interface behavior of PbO₂on pure lead and stainless steel as anode for dye degradation