Tantalum doped titania photocatalysts: Preparation by dc reactive sputtering and catalytic behavior

Visinescu, C.M.; Sanjinés, R.; Lévy, F.; Marcu, V.; Pârvulescu, Vasile I.

doi:10.1016/j.jphotochem.2005.03.017

Cited by 19 publications

(14 citation statements)

References 36 publications

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“…TiO 2 is largely used as photocatalyst due to its beneficial characteristics: high photocatalytic efficiency, physical and chemical stability, low cost and low toxicity [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Preparation of Nanoscale TiO2/SiO2 Composite for Eliminating of Con Red Azo Dye

Nilchi¹,

Janitabar-Darzi²,

Rasouli-Garmarodi³

2011

MSA

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Section: Introductionmentioning

confidence: 99%

Sol-Gel Preparation of Nanoscale TiO2/SiO2 Composite for Eliminating of Con Red Azo Dye

Nilchi¹,

Janitabar-Darzi²,

Rasouli-Garmarodi³

2011

MSA

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“…Both tantalum and niobium have a substantial effect on photocatalytic properties of TiO 2 . These reports, which are contradictory, indicate that the applied procedures in the formation of solid solutions are not reproducible.…”

Section: Brief Literature Overviewmentioning

confidence: 99%

“…where the parameter const in Equations (11) and (12) includes equilibrium constants, ΔH m is the activation enthalpy of motion of electrons, m is the reciprocal of oxygen activity exponent of electron concentration and ΔH f is the enthalpy of the formation of defects. Therefore, the effect of temperature on electrical conductivity can be represented as:…”

Section: Electrical Conductivitymentioning

confidence: 99%

“…There has been common perception that the band gap is the key property of semiconductors that has the critical effect on the efficiency of solar-to-chemical energy conversion. [2][3][4][11][12][13][14][15][16] Therefore, the research strategy on the development of TiO 2 -based systems with enhanced performance is focused on reduction of the band gap.…”

Section: Brief Literature Overviewmentioning

confidence: 99%

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Electrical conductivity and defect disorder of tantalum‐doped TiO₂

et al. 2017

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The present work reports the electrical properties of polycrystalline Ta-doped TiO 2 (0.39 at.% Ta) determined in situ at elevated temperatures (1173-1323 K) in the gas phase of controlled oxygen activity (10 À12 Pa to 10 5 Pa). The effect of oxygen activity on the electrical conductivity and thermoelectric power of TiO 2 is discussed in terms of defect disorder, including (1) the intrinsic electronic disorder that is governed by electronic compensation in the strongly reducing regime, (2) the extrinsic electronic disorder that is governed by electronic charge compensation in the reducing regime, and (3) the extrinsic ionic disorder that is governed by ionic compensation in the oxidizing regime. It is shown that tantalum ions are incorporated into the titanium sublattice of TiO 2 leading to the formation of donor-type energy levels. The Arrhenius-type plot of the electrical conductivity data leads to the determination of the formation enthalpy terms. The obtained results are considered in terms of the effect of tantalum and oxygen activity on the defect disorder and the associated key performance-related properties in the light-induced partial water oxidation. K E Y W O R D SPoint defects, electrical properties, oxides, titanium dioxide | INTRODUCTIONTitanium dioxide is the promising material for water oxidation using solar energy. [1][2][3][4][5] This process, leading either to partial or total water oxidation, may be applied in water purification and the generation of solar fuel, respectively. Intensive research aims at processing TiO 2 with enhanced performance in these applications.The most commonly applied research strategy in processing TiO 2 with enhanced performance is based on the incorporation of a range of extrinsic ions into the TiO 2 lattice.2-5 The influence of the extrinsic ions on the performance in solar energy conversion by TiO 2 has been commonly considered to be determined by reduction of the band gap, which leads to enhanced absorption of sunlight. While the effect of the band gap on light absorption is obvious, the recent studies show that the solar-to-chemical energy conversion by oxide semiconductors and the related charge transfer is profoundly influenced by a range of the key performance-related properties, KPPs, such as the concentration of surface active sites, charge transport, Fermi level and the band gap. [5][6][7] It is shown that the KPPs are defect related. For example, titanium vacancies are the anodic active sites for water oxidation. 5-7 Therefore, these can be modified by defect engineering. 5-7The aim of the present work, which is part of a larger research program on the effect of KPPs of TiO 2 on the solar-to-chemical energy conversion, is the determination of the effect of tantalum on the semiconducting properties

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“…Currently, the most important application of tantalum is in the manufacture of capacitors [2]. Other applications of tantalum are as additive in cutting tools (TaC) [3,4], in the catalysis [5], in medical applications [6], in special glasses with high refractive index for optical use [7], and in corrosion resistant alloys [8].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of phases formed in the aluminothermic reduction of Ta2O5 by plasma

Brito¹,

Medeiros

Mendes³

et al. 2008

Journal of Alloys and Compounds

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Tantalum doped titania photocatalysts: Preparation by dc reactive sputtering and catalytic behavior

Cited by 19 publications

References 36 publications

Sol-Gel Preparation of Nanoscale TiO<sub>2</sub>/SiO<sub>2</sub> Composite for Eliminating of Con Red Azo Dye

Sol-Gel Preparation of Nanoscale TiO<sub>2</sub>/SiO<sub>2</sub> Composite for Eliminating of Con Red Azo Dye

Electrical conductivity and defect disorder of tantalum‐doped TiO₂

Quantitative analysis of phases formed in the aluminothermic reduction of Ta2O5 by plasma

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Tantalum doped titania photocatalysts: Preparation by dc reactive sputtering and catalytic behavior

Cited by 19 publications

References 36 publications

Sol-Gel Preparation of Nanoscale TiO&lt;sub&gt;2&lt;/sub&gt;/SiO&lt;sub&gt;2&lt;/sub&gt; Composite for Eliminating of Con Red Azo Dye

Sol-Gel Preparation of Nanoscale TiO&lt;sub&gt;2&lt;/sub&gt;/SiO&lt;sub&gt;2&lt;/sub&gt; Composite for Eliminating of Con Red Azo Dye

Electrical conductivity and defect disorder of tantalum‐doped TiO2

Quantitative analysis of phases formed in the aluminothermic reduction of Ta2O5 by plasma

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Product

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Sol-Gel Preparation of Nanoscale TiO<sub>2</sub>/SiO<sub>2</sub> Composite for Eliminating of Con Red Azo Dye

Sol-Gel Preparation of Nanoscale TiO<sub>2</sub>/SiO<sub>2</sub> Composite for Eliminating of Con Red Azo Dye

Electrical conductivity and defect disorder of tantalum‐doped TiO₂