A review on the development and advancement of Ta2O5 as a promising photocatalyst

Gurylev, Vitaly

doi:10.1016/j.mtsust.2022.100131

Cited by 26 publications

(26 citation statements)

References 152 publications

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“…In general, the presence of the additional metal oxides that are not expected from the pure MAX would likely inuence the properties and the electrochemical performances of the MAX, since metal oxides such as Nb 2 O 5 , Ta 2 O 5 , TiO 2 and Al 2 O 3 are either photoactive or catalytically active, or both. [73][74][75][76][77] The estimation of the optical band gap of the MAX was obtained based on diffuse reectance measurements. The Kubelka-Munk (K-M) model 53 was applied in the calculation of the absorption coefficient of thick powder samples and subsequently led to the band gap extrapolation from the Tauc plot, through graphical methods.…”

Section: Resultsmentioning

confidence: 99%

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The unexpected photoelectrochemical activity of MAX phases: the role of oxide impurities

Sanna

Novčić

et al. 2023

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

“…In general, the presence of the additional metal oxides that are not expected from the pure MAX would likely influence the properties and the electrochemical performances of the MAX, since metal oxides such as Nb 2 O 5 , Ta 2 O 5 , TiO 2 and Al 2 O 3 are either photoactive or catalytically active, or both. 73–77…”

Section: Resultsmentioning

confidence: 99%

The unexpected photoelectrochemical activity of MAX phases: the role of oxide impurities

Sanna

Novčić

et al. 2023

J. Mater. Chem. A

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“…to make Ta2O5 more efficient in its applications, including composite materials [68][69][70], doping [71][72][73][74], control over shape and morphology [70], etc.…”

Section: ) Different Techniques Have Been Usedmentioning

confidence: 99%

Composite Nanostructured Materials for Renewable Energy Applications

Mustafa

2023

Linköping Studies in Science and Technology. Dissertations

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Diverse sources of energy are becoming increasingly significant in today's world. The most common source of energy today is fossil fuels, such as coal, oil, and gas. While this energy source has many advantages, it also comes with many problems. In order to meet this demand, environmentally friendly and sustainable alternatives to energy are urgently needed. Renewable energy such as hydro, wind, photovoltaics, biomass, and geothermal is an attractive and promising kind of energy. Solar energy is among the most efficient, cleanest, and cheapest sources of energy. In this thesis, two photoprocesses are utilized to produce solar energy using nanostructured materials. One is photocatalysis, mainly photoelectrochemical (PEC) water splitting for hydrogen production and photodegradation of organic dyes, and another is a sunlight-powered photovoltaic cell.In this thesis, we aim to demonstrate optimized low-cost sustainable electrodes based on nanostructured materials for solar energy applications. For PEC water splitting two materials namely ZnO NRs and CuO NLs are fabricated by hydrothermal methods followed by deposition of different materials such as Ag2WO4 and AgBr. These materials show relatively high PEC water splitting efficiency using sunlight. Similarly, for the photodegradation of II organic dyes Ta2O5 is used with the addition of Ag/AgCl nanoparticles (Ag/AgCl NPs), which results in an effective plasmonic photocatalyst for the removal of water-soluble Congo red (CR) dye compounds. For high-efficiency solar cells two methods are applied. Firstly, a FDTD simulation method was applied to study the plasmon enhancement of light absorption from p-i-n junction GaAs nanowires. Secondly a study of anisotropic deformation of colloidal particles exposed to heavy ions irradiation. Finally, a novel low-cost template-assisted method was used in order to improve the alignment of ZnO NRs grown on Si substrates.

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“…Transition metal oxides such as TiO 2 and ZnO are the primary photocatalysts that exhibit high efficiency for photocatalytic processes [ 16 , 17 , 18 ]. Additionally, some other transition metal oxides are used in photocatalytic processes, such as WO 3 [ 19 ], V 2 O 5 [ 20 ], ZrO 2 [ 21 ], Nb 2 O 5 [ 22 ], and Ta 2 O 5 [ 23 ]. Ta 2 O 5 has received a lot of attention among these transition metal oxides as a highly desirable replacement for TiO 2 and ZnO.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the properly positioned band gap of Ta 2 O 5 [ 24 ], it is possible to perform the majority of photocatalytic reactions without the use of additional components and compounds. Furthermore, its conduction band is higher than TiO 2 and ZnO, providing more favorable conditions for the smooth continuation or initiation of reduction reactions [ 23 ]. The main disadvantage of the Ta 2 O 5 photocatalyst is its large gap (around 4 eV), which necessitates the use of strong ultraviolet light (below 310 nm) for photocatalytic reactions [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Micro-Arc Discharges during Anodization of Tantalum for Synthesis of Photocatalytic Active Ta2O5 Coatings

2023

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Ta2O5 coatings were created using micro-arc discharges (MDs) during anodization on a tantalum substrate in a sodium phosphate electrolyte (10 g/L Na3PO4·10H2O). During the process, the size of MDs increases while the number of MDs decreases. The elements and their ionization states present in MDs were identified using optical emission spectroscopy. The hydrogen Balmer line Hβ shape analysis revealed the presence of two types of MDs, with estimated electron number densities of around 1.1 × 1021 m−3 and 7.3 × 1021 m−3. The effect of MDs duration on surface morphology, phase and chemical composition, optical absorption, and photoluminescent, properties of Ta2O5 coatings, as well as their applications in photocatalytic degradation of methyl orange, were investigated. The created coatings were crystalline and were primarily composed of Ta2O5 orthorhombic phase. Since Ta2O5 coatings feature strong absorption in the ultraviolet light region below 320 nm, their photocatalytic activity is very high and increases with the time of the MDs process. This was associated with an increase of oxygen vacancy defects in coatings formed during the MDs, which was confirmed by photoluminescent measurements. The photocatalytic activity after 8 h of irradiation was around 69%, 74%, 80%, and 88% for Ta2O5 coatings created after 3 min, 5 min, 10 min, and 15 min, respectively.

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A review on the development and advancement of Ta2O5 as a promising photocatalyst

Cited by 26 publications

References 152 publications

The unexpected photoelectrochemical activity of MAX phases: the role of oxide impurities

The unexpected photoelectrochemical activity of MAX phases: the role of oxide impurities

Composite Nanostructured Materials for Renewable Energy Applications

Application of Micro-Arc Discharges during Anodization of Tantalum for Synthesis of Photocatalytic Active Ta2O5 Coatings

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