Doping TiO2 for solar energy applications

Malati, Mounir A.; Wong, Wallace K.

doi:10.1016/0376-4583(84)90094-3

Cited by 60 publications

(27 citation statements)

References 65 publications

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“…To study the bandgap of TiO 2 with different morphologies and also to investigate the effect of oxygen non-stoichiometry on the bandgap of TiO 2 , we measured the diffuse reflectance spectra (DRS) on various TiO 2 nanostructures in the as-prepared (AP) and hydrogen annealed conditions (HT) (see Figs. [8][9][10]. TiO 2 has been debated to have direct and indirect bandgaps by several groups [51][52][53][54][55].…”

Section: Resultsmentioning

confidence: 99%

“…TiO 2 is known to crystallize in three main phases: brookite, anatase and rutile. Of these, the latter two, i.e., anatase and rutile are commonly used in most of the applications mentioned earlier [7,8]. Although rutile phase is more thermodynamically stable [9], anatase is preferred for its kinetically stable character in nanocrystalline form at relatively low temperatures [10].…”

Section: Introductionmentioning

confidence: 98%

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Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Das

Ilaiyaraja

Mocherla

et al. 2016

Solar Energy Materials and Solar Cells

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Das

Ilaiyaraja

Mocherla

et al. 2016

Solar Energy Materials and Solar Cells

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“…(0.93 Å ) is significantly larger than that of Ti 4? (0.68 Å ), [41] the insertion of high quantities of yttrium in the titania lattice is necessarily limited. This result is in agreement with the Y 2 O 3 -TiO 2 phase diagram [42] showing a eutectic point for 10% Y 2 O 3 at 1580°C.…”

Section: Supports: Physical Properties (Xrf S Bet Iep)mentioning

confidence: 99%

Gold Nanoparticles on Yttrium Modified Titania: Support Properties and Catalytic Activity

et al. 2011

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A series of titanium oxide catalysts modified with yttrium has been prepared by sol-gel method and their structural properties have been studied. The incorporation of yttrium in the titania lattice favors the formation of oxygen vacancies while at low Y loadings the anatase structure is preserved. The catalytic activity of these solids for CO oxidation is found to be significantly dependent on their physical properties. In particular the amount of dopant controls the number of surface oxygen vacancies created as well as the gold particle size, which directly affects the catalytic activity. Also, a linear relationship between the catalytic activity and the band gap values, which depend on the Y loading, is observed. Density functional theory based calculations show that Y atoms are incorporated at the TiO 2 surface at substitutional positions only, while the preferred oxygen vacancies arise by removing the bridge surface oxygen atoms. These O-vacancies are the preferential adsorption sites for Au atoms and nanoparticles, acting as nucleation centers that favor the dispersion of the catalyst active phase over the support surface. In agreement with experiment, Y doping is found to decrease the band gap of the support due to a destabilization of the valence band of the oxide.

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“…They have attracted considerable interest because of their unique layered structure [18,19,20,21,22]. Since the presence of the alkali metal in these titanates can significantly influence the physical properties, they have so far been studied extensively in order to tune their physical properties beyond the limitations of conventional materials, as reported for instance in applications like electrical devices, photocatalyst, energy storage, gas sensors, and photovoltaics [23,24,25,26]. Among them, potassium (K)-incorporated titanates have been of particular interest due to their specific photochemical properties or their artificial cage type structure [27,28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Lee

Kim

et al. 2015

Nanomaterials

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Nanostructured potassium-incorporated Ti-based oxides have attracted much attention because the incorporated potassium can influence their structural and physico-chemical properties. With the aim of tuning the structural and physical properties, we have demonstrated the wet corrosion process (WCP) as a simple method for nanostructure fabrication using various Ti-based materials, namely Ti–6Al–4V alloy (TAV), Ti–Ni (TN) alloy and pure Ti, which have 90%, 50% and 100% initial Ti content, respectively. We have systematically investigated the relationship between the Ti content in the initial metal and the precise condition of WCP to control the structural and physical properties of the resulting nanostructures. The WCP treatment involved various concentrations of KOH solutions. The precise conditions for producing K-incorporated nanostructured titanium oxide films (nTOFs) were strongly dependent on the Ti content of the initial metal. Ti and TAV yielded one-dimensional nanowires of K-incorporated nTOFs after treatment with 10 mol/L-KOH solution, whereas TN required a higher concentration (20 mol/L-KOH solution) to produce comparable nanostructures. The obtained nanostructures revealed a blue-shift in UV absorption spectra due to the quantum confinement effects. A significant enhancement of the photocatalytic activity was observed via the chromomeric change and the intermediate formation of methylene blue molecules under UV irradiation. This study demonstrates the WCP as a simple, versatile and scalable method for the production of nanostructured K-incorporated nTOFs to be used as high-performance photocatalysts for environmental and energy applications.

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Doping TiO2 for solar energy applications

Cited by 60 publications

References 65 publications

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Gold Nanoparticles on Yttrium Modified Titania: Support Properties and Catalytic Activity

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

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