Brookite, the Least Known TiO2 Photocatalyst

Paola, A. Di; Bellardita, Marianna; Palmisano, Leonardo

doi:10.3390/catal3010036

Cited by 546 publications

(434 citation statements)

References 200 publications

(345 reference statements)

Supporting

Mentioning

395

Contrasting

Unclassified

Order By: Relevance

“…Indeed, it has been found experimentally that thin-film samples of brookite TiO 2 outperform anatase and rutile. 35,40 We note that the improvement in Ref. 40 was attributed to increased absorption in the visible spectrum due to the presence of defects, which may also play a role in improving performance, but the more favourable band alignment will provide a greater thermodynamic driving force for the reduction reaction.…”

Section: Applications Photoelectrochemical Water Splittingmentioning

confidence: 99%

“…For rutile and anatase, the band gap values are from low temperature and ambient pressure measurements, 33,34 while for the less-well studied brookite phase we show the range of experimental values that have been reported. 35 Variation in the ionisation potential, electron affinity and band gap of 4.39 eV, 2.73 eV and 1.91 eV, respectively, is calculated across the eight polymorphs. The baddeleyite phase exhibits an anomalous behaviour, with an exceptionally high position of the valence band (low ionisation potential of 4.77 eV) and a much lower electron affinity (work function phases.…”

Section: Absolute Electronic Energy Levelsmentioning

confidence: 99%

See 1 more Smart Citation

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

et al. 2015

View full text Add to dashboard Cite

We report that the valence and conduction band energies of TiO 2 can be tuned over a 4 eV range by varying the local coordination environments of Ti and O. We examine the electronic structure of eight known polymorphs and align their ionization potential and electron affinity relative to an absolute energy reference, using an accurate multi-scale quantum-chemical approach. For applications in photocatalysis, we identify the optimal combination of phases to enhance activity in the visible spectrum. The results provide a coherent explanation for a wide range of phenomena, including the performance of TiO 2 as an anode material for Li-ion batteries, allow us to pinpoint hollandite TiO 2 as a new candidate transparent conducting oxide, and serve as a guide to improving the efficiency of photoelectrochemical water splitting through polymorph engineering of TiO 2 .

show abstract

Section: Applications Photoelectrochemical Water Splittingmentioning

confidence: 99%

Section: Absolute Electronic Energy Levelsmentioning

confidence: 99%

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The brookite phase could not be observed by XRD; this phase has been reported in acidic conditions with a pH between 1.8 and 3.6 (27). In addition, it is possible that the main (101) diffraction peak of anatase at 2θ = 25.28° overlaps with the (120) and (111) peaks of brookite at 2θ = 25.34° and 25.69°, respectively (28).…”

mentioning

confidence: 81%

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

Vargas

Marín

Restrepo

2015

Journal of Advanced Oxidation Technologies

View full text Add to dashboard Cite

Abstract:There is growing interest in obtaining compounds with photocatalytic activity in the solar spectrum, and this has led to intense research on the topic. In our laboratory, Fe-doped TiO 2 was synthesized using the sol-gel method combined with the solvothermal technique at 200°C and calcined at temperatures between 350 o C and 620 o C. The samples were characterized by X-ray diffraction, Micro-Raman spectroscopy, Brunauer-Emmett-Teller specific surface area, diffuse reflectance spectroscopy, X-ray fluorescence and photocatalytic activity. All materials crystallized in the anatase phase. Additionally the 0.05% Fe-doped TiO 2 calcined at 620°C showed the presence of the rutile phase while 0.1% Fe-doped TiO 2 calcined at 620°C showed the presence of the brookite phase. Photoactivity was observed in the visible spectrum for 0.05% and 0.1% Fe-doped TiO 2 , calcined at 620 o C. Visible activity was attributed to the presence of rutile and an absorption shift to the visible spectrum. Because of the temperature increment, the crystal size grew and the surface area decreased.

show abstract

“…The transformation of brookite to rutile occurs by calcination at elevated temperatures, directly or via anatase. 34 Watson et al (2014), 35 affirm that the formation of phase mixture between anatase and brookite is related to how the octahedral structure condensation in solution occurs. If three octahedral structures are bonded, a linear arrangement occurs and there is a tendency of rutile formation.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

2017

View full text Add to dashboard Cite

This work concerns the preparation a nitrogen-doped TiO 2 by ionothermal synthesis methods and the photocatalytic studies. In this procedure, alkoxide was used as a titanium source, and a deep eutectic mixture of choline chloride and urea (molar ratio 1:2) served as a solvent and source of nitrogen. Different samples were synthesized varying the percentages of the eutectic mixture, titanium butoxide, and water, as well as temperature and reaction time. The catalysts were characterized by X-ray diffraction, Raman spectrometry, scanning electron microscopy, and diffuse reflectance spectroscopy. N-doping was confirmed by X-ray photoelectron spectroscopy. The photocatalytic activity of the N-TiO 2 nanoparticles was evaluated in the oxidation of N,N-dimethyl-4-nitrosoaniline (RNO) dye. The best photocatalytic activity under illumination by UV and visible light was found for the catalysts prepared under reflux in the presence of water, and for the catalysts prepared hydrothermally using intermediate percentages of the nitrogen source (the eutectic mixture).

show abstract

Brookite, the Least Known TiO2 Photocatalyst

Cited by 546 publications

References 200 publications

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

Contact Info

Product

Resources

About

Brookite, the Least Known TiO2 Photocatalyst

Cited by 546 publications

References 200 publications

Polymorph Engineering of TiO2: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

Polymorph Engineering of TiO2: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis

Contact Info

Product

Resources

About

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination

Polymorph Engineering of TiO₂: Demonstrating How Absolute Reference Potentials Are Determined by Local Coordination