Improved photoelectrocatalytic performances over electrochemically reduced WO<sub>3</sub>: implications of oxygen vacancies

Liu, Yunni; Wang, Yao; Lin, Jun

doi:10.1039/d3cp01675g

Cited by 3 publications

(1 citation statement)

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“…Meanwhile, surface oxygen vacancies could result in a decrease in VB due to the local band caused by surface defect [ 25 , 26 ]. In addition, wet chemical reduction, including sol-gel method [ 27 ] and solvothermal method [ 28 ], and electrochemical reduction [ 29 ] are also investigated to construct oxygen vacancies in WO 3 .…”

Section: Introductionmentioning

confidence: 99%

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

Guo,

Wei,

et al. 2024

Nanomaterials

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Creating oxygen vacancy in tungsten trioxide (WO3) has been considered as an effective strategy to improve the photocatalytic performance for degrading organic pollutants. In this study, oxygen vacancies were introduced into WO3 by thermal treatment under Ar atmosphere and their proportion was changed by setting different treatment times. WO3−x samples show better photoelectric properties and photocatalytic degradation performance for carbamazepine (CBZ) than an oxygen-vacancy-free sample, and WO3−x with the optimal proportion of oxygen vacancies is obtained by thermal treatment for 3 h in 550 °C. Furthermore, it discovers that the surface oxygen vacancies on WO3−x would be recovered when it is exposed to air, resulting in a bulk oxygen vacancy dominating WO3−x (bulk-WO3−x). The bulk-WO3−x exhibited much higher degradation efficiency for CBZ than WO3−x with both surface and bulk oxygen vacancies. The mechanism study shows bulk-WO3−x mainly degrades the CBZ by producing OH radicals and superoxide radicals, while oxygen-vacancy-free sample mainly oxidizes the CBZ by the photoexcited hole, which requires the CBZ to be adsorbed on the surface for degradation. The radical generated by bulk-WO3−x exhibits stronger oxidizing capacity by migrating to the solution for CBZ degradation. In summary, the influence of oxygen vacancy on photocatalytic degradation performance depends on both the proportion and location distribution and could lie in the optimization of the photodegradation mechanism. The results of this study could potentially broaden our understanding of the role of oxygen vacancies and provide optimal directions and methods for oxygen vacancy regulation for photocatalysts.

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Section: Introductionmentioning

confidence: 99%

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

Guo,

Wei,

et al. 2024

Nanomaterials

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Revisiting the crucial roles of oxygen vacancies in photo/electro-catalytic degradation of aqueous organic pollutants

Zeng,

Tsui,

Lam

et al. 2024

Applied Catalysis O: Open

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Fluorination of the WO₃ Photoanode to Promote Interfacial Charge Transfer for Efficient Photoelectrocatalytic Performances

Liu,

Zhou,

Lin

2024

J. Phys. Chem. C

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To improve the interfacial charge transfer over a tungsten oxide (WO 3 ) photoanode for an efficient photoelectrocatalytic (PEC) process, WO 3 was fluorinated in a solvothermal process in the presence of NH 4 F. It was shown that, after the fluorination with the molar ratio of NH 4 F to WO 3 at 0.4, the charge separation and charge injection efficiencies increased from 22.02 to 61.15% at 0.5 V vs Ag/AgCl and from 44.71 to 72.69% at 0.5 V vs Ag/AgCl, respectively, significantly enhancing the PEC performances for synergetic tetracycline degradation and H 2 evolution. Various characterization and density functional theory calculation results revealed that the incorporation of fluorine into the WO 3 lattice by fluorination substantially raises the Fermi level of WO 3 , which bends the energy bands of WO 3 more upward at the semiconductor/electrolyte interface. The intensified upward bending bands effectively promote charge transfer at the fluorinated WO 3 photoanode/electrolyte interface, achieving the observed efficient PEC performances.

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Improved photoelectrocatalytic performances over electrochemically reduced WO₃: implications of oxygen vacancies

Abstract: The introduction of rich oxygen vacancies into WO3 lattice has been achieved through a facile and environmentally friendly route of electrochemical reduction. It has been shown that the electrochemical reduction...

Cited by 3 publications

References 50 publications

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

Revisiting the crucial roles of oxygen vacancies in photo/electro-catalytic degradation of aqueous organic pollutants

Fluorination of the WO₃ Photoanode to Promote Interfacial Charge Transfer for Efficient Photoelectrocatalytic Performances

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Improved photoelectrocatalytic performances over electrochemically reduced WO3: implications of oxygen vacancies

Abstract: The introduction of rich oxygen vacancies into WO3 lattice has been achieved through a facile and environmentally friendly route of electrochemical reduction. It has been shown that the electrochemical reduction...

Cited by 3 publications

References 50 publications

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

A Bulk Oxygen Vacancy Dominating WO3−x Photocatalyst for Carbamazepine Degradation

Revisiting the crucial roles of oxygen vacancies in photo/electro-catalytic degradation of aqueous organic pollutants

Fluorination of the WO3 Photoanode to Promote Interfacial Charge Transfer for Efficient Photoelectrocatalytic Performances

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Product

Resources

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Improved photoelectrocatalytic performances over electrochemically reduced WO₃: implications of oxygen vacancies

Fluorination of the WO₃ Photoanode to Promote Interfacial Charge Transfer for Efficient Photoelectrocatalytic Performances