Mesocrystalline TiO2 nanosheet arrays with exposed {001} facets: Synthesis via topotactic transformation and applications in dye-sensitized solar cells

Cai, Jinguang; Ma, Yurong; Qi, Limin

doi:10.1007/s12274-017-1463-0

Cited by 36 publications

(16 citation statements)

References 78 publications

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“…Furthermore, we have compared the fitted parameters with the obtained data for uniform monolith photoanode DSSCs from our previous study [11]. We have disclosed correlation between the increase of V OC (0.72 → 0.75 V) and the value of resistance to the electron recombination at the TiO 2 electrode, R ct (17.2 → 20.36 Ω cm 2 ), confirming that the discrete voltage change might derive from increased recombination resistance and reduced recombination rate [44].…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 56%

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Tasić¹,

Marinkovic-Stanojevic²,

Branković³

et al. 2018

PAC

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Mesoporous TiO 2 films with spherical architectures and promising performance in dye-sensitized solar cells (DSSCs) were prepared. The morphology of the films was investigated by scanning electron microscopy. Transmission electron microscopy analysis of the spheres disclosed the elongated shape of sub-20 nm primary particles, while BET analysis revealed their high surface area of 135 m 2 /g. Anatase presence was observed in the films based on X-ray diffractometry, selected-area electron diffraction analysis and Raman spectroscopy analyses. Increased light scattering of the spheres in visible region was observed by UV-VIS-NIR spectroscopy. Photovoltaic performance of the operating N719-sensitized cells was tested using electrochemical impedance spectroscopy and current density-voltage (J-V) curves under simulated AM1.5 spectrum. The 0.25 cm 2 cells exhibited photo-to-electric power efficiency of 4.9%, which is among noteworthy values for DSSCs with similar photoanodic structures.

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Section: Electrochemical Impedance Spectroscopymentioning

confidence: 56%

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Tasić¹,

Marinkovic-Stanojevic²,

Branković³

et al. 2018

PAC

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“…The aforementioned atomics tructures, illustrated by the HRTEM images, are in good agreement with the projected structure model of an ideal anatase crystal with exposed {101} facets along the [010] direction ( Figure 1i). On the basis of all the above observations, it can be reasonably concluded that unique dumbbell-shapeda natase TiO 2 mesocrystals with nearly 100 %e xposed {101} facets were successfully fabricated in the current reactions ystem.I ts hould be pointed out that althoughw ith the efforts of al arge number of research groups, anatase TiO 2 mesocrystals with platelet-like, [34,38,62] spindleshaped, [35,54,56,57] bipyramidal-shaped, [63] truncated-bipyramidalshaped, [55] spherical-shaped, [64,65] cubic-like, [45,66] and hollowstructured [44] morphologies have already been synthesized,t he realization of anataseT iO 2 mesocrystals with other specific morphologies still remains ag reat challenge. Herein, the successfuls ynthesis of dumbbell-shaped anataseT iO 2 mesocrystals with % 100 %e xposed {101} facets can shed light on the construction of hierarchical TiO 2 superstructures with desired morphologies and architectures, which can pave the way to furtheri mprovet he performance of TiO 2 materials in certain applications.…”

Section: Resultsmentioning

confidence: 99%

Oxygen‐Deficient Dumbbell‐Shaped Anatase TiO_2−x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance

Cao

et al. 2019

Chemistry A European J

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The development of hierarchical TiO 2 superstructures with new morphologies and intriguing photoelectric properties for utilizing solar energy is known to be an effective approach to alleviatet he seriousp roblems of environmental pollution. Herein, uniqueo xygen-deficient dumbbellshaped anatase TiO 2Àx mesocrystals (DTMCs) enclosed by nearly 100 %{ 101} facets were readily synthesized by mesoscale transformation in TiCl 3 /acetic acid (HAc) mixed solution, followed by calcinationunder vacuum. These mesocrystals exhibited much higherp hotoreactivity toward removing the model pollutantsm ethyl orangea nd Cr VI than truncated tetragonalb ipyramidal anatase nanocrystals (TNCs), anatase mesocrystals built from truncated tetragonal bipyramidal anatase nanocrystals (TTMCs), and anatase mesocrystals con-structed by anatase nanocrystals with nearly 100 %e xposed {101} facets (TMCs), revealing that both the oxidation and reductiona bilities of anatase TiO 2 were simultaneously enhanced upon fabricating an oxygen-deficient mesocrystalline architecture with about 100 %e xposed {101} facets. Further characterization illustrated that such an enhancement of photoreactivity was mainly due to the strengthened light absorption, boosted chargec arrier separation, and nearly 100 %e xposed {101} facets of the oxygen-deficientd umbbell-shaped anatase mesocrystals. This work will be useful for guiding the synthesis of oxygen-deficient ordered superstructures of metal oxides with desired morphologies and exposed facets for promising applications in environmental remediation.

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“…It was revealed that the lattice match between the orthorhombic precursor crystal and the tetragonal anatase crystal accounted for the topotactic transformation from (010)-faceted precursor nanosheets to (001)-faceted anatase TiO2 nanosheets ( Figure 4). Most recently, Qi's group proposed a new topotactic transformation method for fabricating anatase TiO 2 mesocrystals [154]. In their synthetic procedure, (010)-faceted orthorhombic titanium-containing precursor nanosheet arrays were firstly synthesized on conducting FTO glass substrate through solvothermally treating 0.1 M K 2 TiO(C 2 O 4 ) 2 in mixed solvents of deionized water and diethylene glycol.…”

Section: Oriented Topotactic Transformationmentioning

confidence: 99%

“…Schematic presentation of topotactic transformation from (010)-faceted precursor nanosheet arrays to (001)-faceted anatase TiO 2 nanosheet arrays on the basis of crystal lattice matchment between orthorhombic precursor crystal and tetragonal anatase crystal. Reprinted with permission from[154]. Copyright Springer, 2017.…”

mentioning

confidence: 99%

Titanium Dioxide (TiO2) Mesocrystals: Synthesis, Growth Mechanisms and Photocatalytic Properties

Zhang

Cao

et al. 2019

Catalysts

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Hierarchical TiO2 superstructures with desired architectures and intriguing physico-chemical properties are considered to be one of the most promising candidates for solving the serious issues related to global energy exhaustion as well as environmental deterioration via the well-known photocatalytic process. In particular, TiO2 mesocrystals, which are built from TiO2 nanocrystal building blocks in the same crystallographical orientation, have attracted intensive research interest in the area of photocatalysis owing to their distinctive structural properties such as high crystallinity, high specific surface area, and single-crystal-like nature. The deeper understanding of TiO2 mesocrystals-based photocatalysis is beneficial for developing new types of photocatalytic materials with multiple functionalities. In this paper, a comprehensive review of the recent advances toward fabricating and modifying TiO2 mesocrystals is provided, with special focus on the underlying mesocrystallization mechanism and controlling rules. The potential applications of as-synthesized TiO2 mesocrystals in photocatalysis are then discussed to shed light on the structure–performance relationships, thus guiding the development of highly efficient TiO2 mesocrystal-based photocatalysts for certain applications. Finally, the prospects of future research on TiO2 mesocrystals in photocatalysis are briefly highlighted.

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Mesocrystalline TiO2 nanosheet arrays with exposed {001} facets: Synthesis via topotactic transformation and applications in dye-sensitized solar cells

Cited by 36 publications

References 78 publications

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Oxygen‐Deficient Dumbbell‐Shaped Anatase TiO_2−x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance

Titanium Dioxide (TiO2) Mesocrystals: Synthesis, Growth Mechanisms and Photocatalytic Properties

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Mesocrystalline TiO2 nanosheet arrays with exposed {001} facets: Synthesis via topotactic transformation and applications in dye-sensitized solar cells

Cited by 36 publications

References 78 publications

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Mesoporous TiO2 spheres as a photoanodic material in dye-sensitized solar cells

Oxygen‐Deficient Dumbbell‐Shaped Anatase TiO2−x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance

Titanium Dioxide (TiO2) Mesocrystals: Synthesis, Growth Mechanisms and Photocatalytic Properties

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Oxygen‐Deficient Dumbbell‐Shaped Anatase TiO_2−x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance