Photocatalytic and electronic properties of TiO2 powders elaborated by sol–gel route and supercritical drying

Boujday, Souhir; Wünsch, F.; Portes, Patrick; Bocquet, J.F.; Colbeau‐Justin, Christophe

doi:10.1016/j.solmat.2004.02.035

Cited by 128 publications

(71 citation statements)

References 17 publications

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“…The calculated value (n = 2.00) appears to be slightly lower than that of CeO 2 (n = 2.2 [9]). Table 2 carriers do not recombine in the bulk, they can migrate to the surface and be trapped by metallic or oxygen ions [25]. (Figure 7).…”

Section: Resultsmentioning

confidence: 99%

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

Cheviré

Muñoz

Baker

et al. 2006

Journal of Solid State Chemistry

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KeywordsModified ceria, solid solution, amorphous citrate route, optical properties, UV absorbers. AbstractA new fluorite-type solid solution domain has been evidenced in the system (1-x) CeO 2 -x/7 Y 6 WO 12 2 using the amorphous citrate route. All the studied phases (0  x  1) crystallize in a cubic-type symmetry. Diffuse reflectance spectra reveal a strong optical absorption between 380 and 400 nm. All substituted compositions spectral selectivities are estimated suitable for application as inorganic UV absorbers.

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Section: Resultsmentioning

confidence: 99%

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

Cheviré

Muñoz

Baker

et al. 2006

Journal of Solid State Chemistry

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“…Aerogels and xerogels were synthesized starting from a classical sol-gel route based on alkoxides [20] and already experienced in a previous study [22]. The following parameters have been selected for the whole study: R = H 2 O/Ti = 3.4, C = HNO 3 /Ti = 0.07 and S = iPrOH/Ti = 15.…”

Section: Synthesis Routementioning

confidence: 99%

“…It is cheap and has been studied for long, especially for application in solar cells [9,10] or for its photocatalytic properties [11,12]. Different morphologies have thus already been developed, nanoparticles, nanotubes or even aerogels [13][14][15][16][17][18][19][20][21][22][23] for instance. Morphology is a major feature of PEMFC catalyst supports, especially at the cathode side, since it governs diffusion limitations related to gas diffusion towards (oxygen) and from (water) catalytic sites inside the cathodic catalyst layer.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Doped TiO 2 aerogels as alternative catalyst supports for proton exchange membrane fuel cells: A comparative study of Nb, V and Ta dopants

Beauger

Testut

Berthon‐Fabry

et al. 2016

Microporous and Mesoporous Materials

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Nb, Ta and V-doped TiO 2 aerogels and xerogels have been synthesized as possible new alternatives to carbon blacks for Proton Exchange Membrane Fuel Cells catalyst supports. A comparative study of different dopants was realized in a single study. Nb, Ta and V showed different behaviors with respect to the final material structure and morphology, composition and electronic conductivity. They are all prone to surface segregation, to different extents. V-doped TiO 2 apart, the rutile structure could only be obtained after calcination in a reducing atmosphere at 800 °C for Nb or Ta-doped TiO 2 . The electronic conductivity exhibited a maximum at 10 at.% for Nb and Ta, 5 at.% for V. Nb revealed to be the most appropriate dopant to increase the electronic conductivity of TiO 2 , followed by Ta and V.4 to 5 orders of magnitude were gained after Nb doping for xerogels conductivity to reach almost 0.1 S cm -1 . The role of point defects was discussed to account for phase transition and evolution of conductivity.

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“…The efficiency of electron transfer from ITO or ZnO to TiO 2 for each samples, was taken as the ability to degrade the Cibacron Yellow dye under UV irradiation. It is well known that the photocatalytic activity of the TiO 2 is mainly due to its anatase phase [13]. On the other hand the photocatalytic activity depends on the specific surface area of the catalyst and essentially on the surface defect density.…”

Section: Photo-catalytic Degradationmentioning

confidence: 99%

TiO₂-ITO and TiO₂-ZnO nanocomposites: application on water treatment

Chorfi

Saadoun

Bousselmi

et al. 2012

EPJ Web of Conferences

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Abstract. One of the most promising ideas to enhance the photocatalytic efficiency of the TiO 2 is to couple this photocatalyst with other semiconductors. In this work, we report on the development of photo-catalytic properties of two types of composites based on TiO 2 -ITO (Indium Tin Oxide) and TiO 2 -ZnO deposited on conventional ceramic substrates. The samples were characterized by X-ray diffraction (XRD) and transmission Electron Microscopy (TEM). The photo-catalytic test was carried out under UV light in order to reduce/oxidize a typical textile dye (Cibacron Yellow). The experiment was carried out in a bench scale reactor using a solution having a known initial dye concentration. After optimization, we found that both nanocomposites exhibit better photocatalytic activity compared to the standard photocatalyst P25 TiO 2 .

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Photocatalytic and electronic properties of TiO2 powders elaborated by sol–gel route and supercritical drying

Cited by 128 publications

References 17 publications

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

Doped TiO 2 aerogels as alternative catalyst supports for proton exchange membrane fuel cells: A comparative study of Nb, V and Ta dopants

TiO₂-ITO and TiO₂-ZnO nanocomposites: application on water treatment

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Photocatalytic and electronic properties of TiO2 powders elaborated by sol–gel route and supercritical drying

Cited by 128 publications

References 17 publications

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO2–Y6WO12

Doped TiO 2 aerogels as alternative catalyst supports for proton exchange membrane fuel cells: A comparative study of Nb, V and Ta dopants

TiO2-ITO and TiO2-ZnO nanocomposites: application on water treatment

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TiO₂-ITO and TiO₂-ZnO nanocomposites: application on water treatment