Electrochemical impedance spectroscopy to study photo - induced effects on self-organized TiO2 nanotube arrays

Pu, Peiyu; Cachet, H.; Sutter, Éliane

doi:10.1016/j.electacta.2010.05.048

Cited by 58 publications

(66 citation statements)

References 37 publications

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“…The initiation of electropolymerization in LiClO 4 solution in the dark is less obvious to explain. Since during the synthesis, alternative anodic and cathodic scans are applied on the substrate, hydrogen insertion into the TiO 2 nanotubes can be promoted, increasing progressively the doping level of the semiconductor and consequently its conductivity [16,[26][27][28]. A similar explanation has been given in the case of the WO 3 /PPy system, for which the electroactivity in the dark in the anodic range has been attributed to H + uptake [12].…”

Section: Eis Investigations In the Dark And Under Uv Of Junctions Promentioning

confidence: 58%

“…In previous works [4,16], it has been shown that this capacitance actually includes the space charge layer capacitance and the surface state capacitance which are in parallel. Nevertheless at first approximation, the experimental capacitance values were reported in a Mott Schottky representation, leading to a rough estimation of either the flat band potential value (between 0V and -0.1 V vs. SCE in Fig.…”

Section: Eis Investigations In the Dark And Under Uv Of Junctions Promentioning

confidence: 99%

“…According to a geometric model previously used [4,15,16] which considers a regular network of identical and equally spaced nanotubes, the developed surface of the whole nanotube arrays is given by the following equation:…”

Section: Synthesis Of Tio 2 -Ntasmentioning

confidence: 99%

See 2 more Smart Citations

Photo-assisted electrodeposition of an electrochemically active polypyrrole layer on anatase type titanium dioxide nanotube arrays

Ngaboyamahina

Cachet

Pailleret

et al. 2014

Electrochimica Acta

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Section: Eis Investigations In the Dark And Under Uv Of Junctions Promentioning

confidence: 58%

Section: Eis Investigations In the Dark And Under Uv Of Junctions Promentioning

confidence: 99%

See 1 more Smart Citation

Photo-assisted electrodeposition of an electrochemically active polypyrrole layer on anatase type titanium dioxide nanotube arrays

Ngaboyamahina

Cachet

Pailleret

et al. 2014

Electrochimica Acta

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“…Since Gong and co-workers successfully fabricated the first generation of TiO 2 nanotubular arrays by anodizing a titanium foil in a fluoride-based electrolyte [1], this highly ordered and vertically oriented morphology keeps attracting the attention due to its particular properties [2][3][4]: a large internal surface, direct transport pathways and the possibility to form surface states that influence the interfacial electron-transfer process. 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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“…31 Pu et al have reported a photovoltage of 510 mV and 616 mV upon white light irradiation in the case of porous and compact films, respectively. 33 In fact, when the appropriate photons are absorbed, the band bending will increase due to the extra-electronic exchange on the interface TiO 2 /solution and this will lead to the shift of the new flat band to more negative values.…”

Section: Photoelectrochemical Performancementioning

confidence: 99%

Visible Light Water Splitting via Oxidized TiN Thin Films

et al. 2012

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Thin films of TiN were prepared via RF magnetron reactive sputtering at various deposition pressures. The characteristics of the plasmas were measured by optical emission spectroscopy to optimize the conditions for the deposition of TiN coatings. After deposition, the thin films were annealed in a closed furnace at several different temperatures, and revealed the formation of different phases of TiO2. The resulting TiN/TiO2 thin films showed drastic changes in their crystal structure, optical properties, and photoelectrochemical performance. By examining how the deposition pressure and postdeposition annealing conditions affected the TiN film structure and performance, samples were prepared to optimize visible light absorption and activity. A model for the oxidation process was proposed which described the structural change from TiN to TiO2 through optical, morphological, and crystalline characterization. This study has systematically shown the ability to tailor the optical, crystalline, and photoactive properties of TiO2 by tailoring the intrinsic properties of TiN thin films and subsequent annealing. These results can be utilized for many solar driven optoelectronic devices.

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Electrochemical impedance spectroscopy to study photo - induced effects on self-organized TiO2 nanotube arrays

Cited by 58 publications

References 37 publications

Photo-assisted electrodeposition of an electrochemically active polypyrrole layer on anatase type titanium dioxide nanotube arrays

Photo-assisted electrodeposition of an electrochemically active polypyrrole layer on anatase type titanium dioxide nanotube arrays

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

Visible Light Water Splitting via Oxidized TiN Thin Films

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