Effect of Sc3+/V5+ Co-Doping on Photocatalytic Activity of TiO2

Murzin, Petr D.; Мурашкина, А. А.; Emeline, Alexei V.; Bahnemann, Detlef W.

doi:10.1007/s11244-020-01292-1

Cited by 12 publications

(7 citation statements)

References 31 publications

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“…However, the application of this method has certain limitations: since the method is based on the oscillating capacitor system, the heterostructure material must have a flat surface morphology. That means that the photoactive heterostructured materials should be either in the "sandwich like" form (layer by layer) [115] or pressed in the form of plate [116].…”

Section: Electrophysical Characterizationmentioning

confidence: 99%

Photoactive Heterostructures: How They Are Made and Explored

et al. 2021

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In our review we consider the results on the development and exploration of heterostructured photoactive materials with major attention focused on what are the better ways to form this type of materials and how to explore them correctly. Regardless of what type of heterostructure, metal–semiconductor or semiconductor–semiconductor, is formed, its functionality strongly depends on the quality of heterojunction. In turn, it depends on the selection of the heterostructure components (their chemical and physical properties) and on the proper choice of the synthesis method. Several examples of the different approaches such as in situ and ex situ, bottom-up and top-down, are reviewed. At the same time, even if the synthesis of heterostructured photoactive materials seems to be successful, strong experimental physical evidence demonstrating true heterojunction formation are required. A possibility for obtaining such evidence using different physical techniques is discussed. Particularly, it is demonstrated that the ability of optical spectroscopy to study heterostructured materials is in fact very limited. At the same time, such experimental techniques as high-resolution transmission electron microscopy (HRTEM) and electrophysical methods (work function measurements and impedance spectroscopy) present a true signature of heterojunction formation. Therefore, whatever the purpose of heterostructure formation and studies is, the application of HRTEM and electrophysical methods is necessary to confirm that formation of the heterojunction was successful.

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Section: Electrophysical Characterizationmentioning

confidence: 99%

Photoactive Heterostructures: How They Are Made and Explored

et al. 2021

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Section: ■ Introductionmentioning

confidence: 99%

“…So, the decrease in work function silently increases the electron transfer from the photocatalyst to the dye during its degradation in the aqueous solution. In several earlier studies, photocatalytic activity has been boosted by reducing the material’s work function using various techniques; for instance, through forming Ag–TiO 2 nanocomposite thin films, N-doping in TiO 2 , codoping of TiO 2 with Sc 3+ /V 5+ , and even controlling the thickness of the ITO films . This sort of heterogeneous photocatalyst has several other applications, such as water splitting, CO 2 reduction, bacterial disinfection, and many more. − Additionally, heterojunction photocatalysts, such as TiO 2 /r-GO, ZnO/CuO, g-C 3 N 4 /Ag 2 CO 3 /GO, and many others, have been studied to improve the photocatalytic performance. ,,,, Due to their different work functions and band alignments, nano heterostructures establish build-in potential at their interfaces.…”

Section: Introductionmentioning

confidence: 99%

Reduced Work Function in Anatase ⟨101⟩ TiO₂ Films Self-Doped by O-Vacancy-Dependent Ti³⁺ Bonds Controlling the Photocatalytic Dye Degradation Performance

Das,

Shyam

2024

Langmuir

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TiO 2 has the proven capability of catalytically decomposing pollutants under light illumination, thereby embracing potential applications in wastewater management. The photocatalytic dye degradation activity is largely controlled by the optical band gap that dictates the extent of electron− hole pair generation via photon absorption, and the recombination kinetics of charges. In this context, the material's work function governs how easily the charge carriers can be transferred at the dye-adsorbed photocatalytically active sites. Accordingly, nanocrystalline TiO 2 thin films are grown in the anatase phase with ⟨101⟩ orientation, using RF magnetron sputtering at 200 °C. Besides studying the film's structural morphology, optical band gap, and elemental composition, the electronic properties are extensively investigated. The work function of the material was controlled by varying the O-vacancydependent Ti 3+ bonding configuration in the network. It has been demonstrated how the photocatalytic methylene blue dye degradation activity of the nanocrystalline TiO 2 films of predominantly the anatase phase improves on reducing the sputtering pressure during deposition. At a low deposition pressure of 20 mTorr, a low work function of ∼4.2 eV of the film, resulting from the formation of a Ti 3+ -bond through the O vacancies in the network, potentially increases its carrier lifetime and delivers the superior photocatalytic activity (∼82.7% dye degradation with a rate constant of k ∼ 0.0073 min −1 ) via silently facilitating fast electron transfer from the photocatalyst to the dye in the aqueous solution. The higher stoichiometric film prepared at p = 40 mTorr exhibits an inferior photocatalytic activity (∼20.4% dye degradation with a rate constant of k ∼ 0.0009 min −1 ), as retarded by its higher work function of ∼4.62 eV, despite retaining a relatively low band gap. Thus, without using any heterojunction or extrinsically doped photocatalyst, the dye degradation can be controlled simply by reducing the work function of nanocrystalline TiO 2 thin films via controlling the O-vacancy-dependent Ti 3+ bonding in its self-doped network.

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“…The doping of a single metal atom in metal oxide surfaces has attracted considerable interest, as it could afford precious metal thriing and solve the ultimate goal of designing efficient and low-cost catalysts in heterogeneous catalysis. [24][25][26][27][28] For example, Y. Meng et al demonstrated that the doping of the Pd atom improved the thermodynamic stability and catalytic performance of the Cu(111) surface towards partial oxidation of methane than the single Pd atom adsorbed surface. 28 Similarly, Guo and coworkers 29 have recently shown that Rh doped Ni(111) catalyst exhibits promising performance for coke resistance in the CH 4 /CO 2 reforming reaction.…”

Section: Introductionmentioning

confidence: 99%