Effect of oxidisable substrates on the photoelectrocatalytic properties of thermally grown and particulate TiO2 layers

Krýsa, Josef; Zlámal, Martin; Waldner, Georg

doi:10.1007/s10800-007-9415-0

Cited by 22 publications

(7 citation statements)

References 20 publications

(32 reference statements)

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“…At a bias of 2.0 V, the positively charged peroxotitanium complexes are transported to the vicinity of the cathode, where the solution is basic due to the presence of electrogenerated OH -ions. Then it may cause the precipitation of an insoluble peroxotitanium hydrate, TiO 3 [31]. In addition, the positively charged SiO 2 nanoparticles are also electrophoretically transported toward the cathode, and co-deposited with the above mentioned peroxotitanium hydrate.…”

Section: The Preparation and Characterization Of Tio 2 /Sio 2 Composimentioning

confidence: 99%

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Electrochemical preparation of TiO2/SiO2 composite film and its high activity toward the photoelectrocatalytic degradation of methyl orange

Zhou

Zhu

et al. 2009

J Appl Electrochem

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Uniform TiO 2 /SiO 2 composite films were prepared on ITO substrates by electrodeposition, and highly photoelectrocatalytic (PEC) activity of the composite films was observed toward the degradation of methyl orange (MO) in aqueous solutions. It was further found that their PEC activity was dependent on the electrodeposition parameters including deposition time, solution pH and SiO 2 content. Under the optimized condition, the PEC degradation of MO on TiO 2 /SiO 2 composite film electrode could be enhanced about 14 times relative to that on neat TiO 2 film electrode. The high PEC activity of the TiO 2 / SiO 2 composite film electrode was mainly attributed to the enhancement of the charge separation of photo-generated electron-hole pairs by the dispersion of SiO 2 nanoparticles in the TiO 2 matrix with the aid of the applied electric field.

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Section: The Preparation and Characterization Of Tio 2 /Sio 2 Composimentioning

confidence: 99%

“…Recently, photoelectrocatalytic (PEC) technologies have been studied extensively [1][2][3][4][5]. One of the earlier reports about the PEC application of TiO 2 films is the work of Vinodgopal et al, who prepared TiO 2 films and degraded 4-chlorophenol over the TiO 2 film electrode by an electrochemically assisted photocatalytic method [6].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical preparation of TiO2/SiO2 composite film and its high activity toward the photoelectrocatalytic degradation of methyl orange

Zhou

Zhu

et al. 2009

J Appl Electrochem

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“…Rutile and anatase TiO 2 films can be grown on Ti plates by thermal oxidation [33,47] in air or oxygen. A very important step in the preparation of the oxide layers, especially when applying short oxidation times, is the pre-treatment consisting in cleaning the Ti support with ethanol and etching it in acid prior to thermal oxidation.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Özcan

Yurdakal

Augugliaro

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThe photoelectrocatalytic partial oxidation of 4-methoxybenzyl alcohol in aqueous solution irradiated by near-UV light was carried out in a three-electrode batch reactor. TiO 2 films were either deposited by dip-coating of a TiO 2 sol onto a Ti foil and subsequent calcination or generated on Ti plates by thermal oxidation in air at 400-700 • C. The effects of the anode preparation method and bias potential values on conversion and selectivity to the corresponding aldehyde were investigated. The photoelectrocatalytic results were compared with the photocatalytic and electrocatalytic ones. The results indicated that no reaction occurred during the electrocatalytic experiments, whereas the photocatalytic reactivity was positively influenced by the application of a small bias (0.75 V vs. saturated calomel electrode). By applying the previous bias the highest initial degradation rates, r 0 , and selectivities to 4-methoxybenzaldehyde, S, were obtained in photoelectrocatalytic experiments by using Ti plate calcined at 500 • C (r 0 = 0.1507 mM h −1 , S = 85%) or TiO 2 film prepared by dip-coating and calcined at 700 • C (r 0 = 0.1339 mM h −1 , S = 90%). In order to investigate the influence of the substituent groups on reactivity and selectivity, photoelectrocatalytic runs with benzyl alcohol, 2-methoxybenzyl alcohol, 3-methoxybenzyl alcohol, 2,4-dimethoxybenzyl alcohol, 2,3,4-trimethoxybenzyl alcohol, 4-nitrobenzyl alcohol and 4-hydroxybenzyl alcohol have been performed. The selectivity and reactivity values increased by increasing the electron-donor properties of the substituent groups. This positive effect, however, was obtained only if the electron-donor group is in para or ortho position with respect to the alcoholic group.

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“…The recent literature data are more consecrated to photoelectrochemical activity of the TiO 2 particles prepared by the sol-gel method and thermally simulated current by structural transformation of amorphous to anatase phase in the film [17]. The particulate prepared layers from dispersion of Degussa P-25 TiO 2 deposited onto the Ti substrate and subsequently sintered from 500 o C to 700 o C have been also practiced [18,19]. The photocurrent measured values for particulate TiO 2 layers are much lower than those of thermal layers, due to the poor contact among individual particles, resulting in high electric resistance of the whole layer.…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical investigations of thermally formed films on titanium surfaces

Mickova

2009

Maced. J. Chem. Chem. Eng.

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The semi-conducting and photoelectrical properties of TiO2 films prepared with thermal oxidation of titanium in the temperature range from 200 to 600 ºC were studied. Short theoretical background for application of photocurrent in semiconductor electrochemistry was presented. For all investigated temperatures and times of thermal treatments the semi-conducting properties as photocurrent peaks and band gap energies were determined. At lower temperatures the anodic values of photocurrent peaks confirmed the existence of n-type semiconducting TiO2 films with amorphous structure. With increasing the temperature and time of thermal treatment the development of crystalline structure in the film is followed with small decreasing of band gap energy. For films formed at higher temperatures and longer time of thermal treatment the determined band gap energies are close to the 3 eV that corresponds to the rutile structure of the film.

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Effect of oxidisable substrates on the photoelectrocatalytic properties of thermally grown and particulate TiO2 layers

Cited by 22 publications

References 20 publications

Electrochemical preparation of TiO2/SiO2 composite film and its high activity toward the photoelectrocatalytic degradation of methyl orange

Electrochemical preparation of TiO2/SiO2 composite film and its high activity toward the photoelectrocatalytic degradation of methyl orange

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Photoelectrochemical investigations of thermally formed films on titanium surfaces

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