Mixed-Phase TiO2 Nanomaterials as Efficient Photocatalysts

Lei, Juying; Li, Hong; Zhang, Jinlong; Anpo, Masakazu

doi:10.1007/978-3-319-25340-4_17

Cited by 16 publications

(5 citation statements)

References 134 publications

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“…Meanwhile, a similar low transmittance value of 0.39% was obtained for ann TiO 2 NRs-NFs/TiO 2 NPs, TiO 2 NRs-NFs/TC14-rGO/TiO 2 NPs and TiO 2 NRs-NFs/TiO 2 NPs/TC14-rGO hybrid films. This lower transmittance was due to the thick yet homogeneous TiO 2 NPs as presented in FESEM images.Additional optical bandgap energy (E g ) calculations based on Tauc's plot obtained from the intersection of the tangent line interpolation and the horizontal reference line[70] reveals the similar value of the theoretical rutile bandgap (3.02 eV) of non-ann TiO 2 NRs-NFs[12]. This value decreased to 2.95 eV after the film was annealed as post-treatment after hydrothermal growth.…”

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confidence: 74%

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Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Suriani

Muqoyyanah

Mohamed

et al. 2019

Nano-Structures & Nano-Objects

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confidence: 74%

“…Anatase is a metastable phase that can transform into rutile by high temperature, while rutile is the most stable form. Both anatase and rutile phases were commonly utilized for DSSCs applications due to their high photocatalytic activity [12].…”

Section: Introductionmentioning

confidence: 99%

Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Suriani

Muqoyyanah

Mohamed

et al. 2019

Nano-Structures & Nano-Objects

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“…[10] The effect of transition metal doping was suggested to be transforming part of the anatase form of TiO 2 to rutile. However, since the mixed-phase TiO 2 is usually more active than pure-phase, [31] the results cannot guarantee that the rutile is more active than anatase. On the other hand, some works found that anatase TiO 2 is more active than rutile.…”

Section: Introductionmentioning

confidence: 99%

Unifying the Nitrogen Reduction Activity of Anatase and Rutile TiO₂ Surfaces

Liu

Fan

2022

ChemPhysChem

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TiO 2 is a model transition metal oxide that has been applied frequently in both photocatalytic and electrocatalytic nitrogen reduction reactions (NRR). However, the phase which is more NRR active still remains a puzzle. This work presents a theoretical study on the NRR activity of the ( 001), ( 100), (101), and (110) surfaces of both anatase and rutile TiO 2 . We found that perfect surfaces are not active for NRR, while the oxygen vacancy can promote the reaction by providing excess electrons and low-coordinated Ti atoms that enhance the binding of the key intermediate (HNN*). The NRR activity of the eight facets can be unified into a single scaling line. The anatase TiO 2 (101) and rutile TiO 2 (101) surfaces were found to be the most and the second most active surfaces with a limiting potential of À 0.91 V and À 0.95 V respectively, suggesting that the TiO 2 NRR activity is not very phase-sensitive. For photocatalytic NRR, the results suggest that the anatase TiO 2 (101) surface is still the most active facet. We further found that the binding strength of key intermediates scale well with the formation energy of oxygen vacancy, which is determined by the oxygen coordination number and the degree of relaxation of the surface after the creation of oxygen vacancy. This work provides a comprehensive understanding of the activity of TiO 2 surfaces. The results should be helpful for the design of more efficient TiO 2 -based NRR catalysts.

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“…The results obtained in these works sometimes lead to contradictory conclusions when comparing of the photocatalytic activity of the TiO 2 mixed-phase in various redox processes. Many authors reported that the photocatalytic activity of mixtures of TiO 2 phases in a number of processes is higher in comparison with the pure single polymorphs [14,16,20,21,24,[49][50][51]. It is attributed to the synergistic effect of different positions of the energy levels of different phases of titanium dioxide, which leads to the spatial separation of photogenerated charges in mixed-phase materials, decrease in the negative electron -hole recombination of charges, and increase in the activity of these materials in various redox processes [20,31,36,[52][53][54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

et al. 2021

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Different phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2), comprised of anatase (16–100%), rutile (0–70%) and brookite (0–52%) were obtained by sol–gel synthesis with or without hydrothermal treatment (HTT) by means of titanium tetrabutoxide and dibenzo-18-croun-6 as structure-forming agent in the presence of HCl. It was shown, that small amounts of surfactant and/or lanthanum salt as well as HTT determine phase composition and texture of meso-nc-TiO2. All samples were calcined at 500 оС and characterized by SEM, TEM, XRD and N2-adsorption/desorption isotherms. It has been established that photocatalytic properties of almost all obtained samples significantly exceed the photocatalytic activity of Evonik P-25 TiO2 in gas phase ethanol oxidation. The most active sample is characterized by phase composition of anatase (97%)-rutile (3%). It is obvious, that decrease of photocatalytic activity of sample was affected by decrease of anatase phase content. It was shown that the specific surface area of the sample is not a key factor affecting the activity of mixed-phase meso-nc-TiO2 samples in the process of ethanol oxidation.

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Mixed-Phase TiO2 Nanomaterials as Efficient Photocatalysts

Cited by 16 publications

References 134 publications

Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Unifying the Nitrogen Reduction Activity of Anatase and Rutile TiO₂ Surfaces

Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

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Mixed-Phase TiO2 Nanomaterials as Efficient Photocatalysts

Cited by 16 publications

References 134 publications

Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Titanium dioxide/agglomerated-free reduced graphene oxide hybrid photoanode film for dye-sensitized solar cells photovoltaic performance improvement

Unifying the Nitrogen Reduction Activity of Anatase and Rutile TiO2 Surfaces

Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

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Unifying the Nitrogen Reduction Activity of Anatase and Rutile TiO₂ Surfaces