Vanadium-doped TiO2 anatase nanostructures: the role of V in solid solution formation and its effect on the optical properties

Avansi, Waldir; Arenal, Raúl; Mendonça, Vagner R. de; Ribeiro, Cauê; Longo, E.

doi:10.1039/c3ce42356e

Cited by 49 publications

(38 citation statements)

References 62 publications

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“…Compared with TiO 2 photoanode materials without Cu 2+ and Fe 2+ doping, the incorporation of Mn 2+ can effectively increase the light conversion efficiency of TiO 2 . Avansi et al [17] synthesized V-doped TiO 2 nanostructures and observed single-crystalline anatase phase despite the different amounts of V ions. Li et al [15] reported a novel Ni-doped TiO 2 inverse opal photonic microarray (IOPM) structure photocatalyst and Ni doping could increase the visible light absorption.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Xue

Luo

et al. 2020

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Mo-doped TiO2 nanotube arrays are prepared successfully by a combined method of direct current (DC) magnetron sputtering and anodic oxidation. The doping amount of Mo can be modified by changing the number of molybdenum blocks on the Ti target while a Ti–Mo alloy film is prepared by magnetron sputtering on a metal Ti substrate, following a Mo-doped TiO2 nanotube array grown by anodization. Morphology test shows that the doping of Mo could inhibit the phase transition and growth of crystal of TiO2. X-ray photoelectron spectroscopy (XPS) results show that Mo has successfully been embedded in the TiO2 crystal lattice and mainly exists in the valence states of Mo6+. Mo-doping samples show slightly increased visible light absorption as the red shift of TiO2 absorption edge with the band gap dropping from 3.24 to 3.16 eV with 0.5 at.% Mo doping. The enhanced photocurrent is demonstrated for a 0.5 at.% Mo-doped TiO2 electrode. Through photoelectric performance testing under UV-visible light irradiation, the nanotube array film with a Mo-doped content of 0.5% produced the maximum photocurrent density, which is about four times the undoped TiO2 nanotube array film, exhibiting a considerable photoelectric effect gain. The controllable Mo doping TiO2 nanotube array film prepared by this combining technique is expected as a promising material for efficient applications in photoelectric conversion.

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Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Xue

Luo

et al. 2020

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“…This route has become a very attractive method for producing nanosized and pure materials in simple reactive conditions because the process is carried out with no contaminants such as halide ions . Combining the OPM route with hydrothermal treatment can improve the properties of the synthesised nanostructures with these environmentally friendly methods . In a previous research, nanocrystalline TiO 2 was successfully obtained via the OPM route, and improved photocatalytic performance was observed during dye degradation tests ,,.…”

Section: Introductionmentioning

confidence: 99%

“…[4] Combining the OPM route with hydrothermal treatment can improve the properties of the synthesised nanostructures with these environmentally friendly methods. [25] In a previous research, nanocrystalline TiO 2 was successfully obtained via the OPM route, and improved photocatalytic performance was observed during dye degradation tests. [7,20,23] One of the main reasons for the increase in the photocatalytic effect is the crystallization of powders at low temperatures, which is related to the vigorous exothermic decomposition that occurs during synthesis.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

García

Guaglianoni

Garcia³

et al. 2018

ChemistrySelect

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Nanostructured titanium dioxide with high photocatalytic efficiency was synthesised by the oxidant peroxide method and microwave‐assisted hydrothermal treatment without calcination or doping. The influence of pH during hydrothermal treatment was investigated on the morphology, crystallinity, phase composition, specific surface area, photoluminescence properties, and photocatalytic behaviour. The pH of the medium had no significant effect on the nanostructured titanium dioxide morphologies but at higher pH, the powders presented lower surface area and higher particle size. A slight decrease in the photoluminescence intensity of the sample prepared at low pH was related to surface protonation. This material also exhibited higher photocatalytic performance in degrading methyl orange solutions than those obtained at a higher pH or commercial TiO2. Aditionally, the hydrogen production rate increased with the solution pH following heat treatment, with optimized results in deionized water. Finally, the powders did not require either heat treatment or doping with another metal to achieve more activity than the commercially available oxide.

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“…Additional investigation is being conducted using more practical sample systems, such as vanadium (V)doped titanium dioxide (TiO 2 ), that are promising materials for photocatalysts in the visible light region. [27,28] The valence state and local structure of these V ions are important for understanding photocatalytic activity. In this case, it is difficult to obtain the EXAFS spectrum because the Kα line of V is overlapped by the Kβ line of Ti.…”

Section: Discussionmentioning

confidence: 99%

XAFS spectra from X‐ray fluorescence Kβ line using conventional energy‐discriminating detector

et al. 2019

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X‐ray fluorescence spectra of copper (Cu) metal, copper monoxide (CuO), and potassium chromate (K2CrO4) were recorded as a function of incident X‐ray energy near the Cu K‐edge and chromium (Cr) K‐edge, respectively, using a conventional silicon drift detector. The spectra contained components due to elastic, inelastic, and multiple scattering, in addition to the Kα and Kβ lines. Cu and Cr K‐edge X‐ray absorption fine structure (XAFS) spectra of Cu, CuO, and K2CrO4 were obtained by an intensity analysis of the Kα and Kβ lines. The intensity of the Kβ line for the different incident photon energies was obtained by numerically removing the additional scattering components using the MUSCAT program. These spectra exhibited a jump near the K absorption edges, which reproduced the spectral features obtained in transmission mode for both Cu, CuO, and K2CrO4. A chemical shift was also clearly identified in the X‐ray absorption near edges structure using the X‐ray fluorescence Kβ line. In addition, the Cr K‐edge extended XAFS spectrum of K2CrO4 was clearly observed using the Cr Kβ fluorescent line. The XAFS measurements on the Kα and Kβ lines are possible, and they carry equally valuable information.

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Vanadium-doped TiO2 anatase nanostructures: the role of V in solid solution formation and its effect on the optical properties

Cited by 49 publications

References 62 publications

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

XAFS spectra from X‐ray fluorescence Kβ line using conventional energy‐discriminating detector

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Vanadium-doped TiO2 anatase nanostructures: the role of V in solid solution formation and its effect on the optical properties

Cited by 49 publications

References 62 publications

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO2 with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

XAFS spectra from X‐ray fluorescence Kβ line using conventional energy‐discriminating detector

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Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production