Physical spread and technical upshift in the band gaps of visible-light photocatalytic bismuth oxyhalide solid solutions

Huo, Xuejian; Huang, Liang‐Feng

doi:10.1016/j.commatsci.2020.109870

Cited by 7 publications

(3 citation statements)

References 54 publications

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“…Although the highly efficient GGA-PBE form of density functional tends to underestimate the band gap, it can always give out correct trends, and the yielded structures and stabilities are always accurate. 44,45 Figure 9a gives the Tauc plot of (αhν) 1/2 with respect to the photo energy (hν) that is obtained by a certain conversion of the light transmittance. 36 Figure 9b shows the (αhν) 1/2 curves calculated by DFT for the V O @TiO 2 , Fe Ti +V O @TiO 2 , and Fe Ti @TiO 2 systems, which have similar trends as the experimental curves that will be discussed in detail below.…”

Section: ■ Results and Discussionmentioning

confidence: 62%

“…There are four crystal structures considered in the calculations of light-absorption spectra, i.e., pristine anatase TiO 2 and defective TiO 2 systems with an O vacancy (V O @TiO 2 ), a Fe substituent at a Ti site (Fe Ti @TiO 2 ), and a Fe Ti plus a neighboring V O (Fe Ti +V O @TiO 2 ), as shown in Figure . Although the highly efficient GGA-PBE form of density functional tends to underestimate the band gap, it can always give out correct trends, and the yielded structures and stabilities are always accurate. , Figure a gives the Tauc plot of (α h ν) 1/2 with respect to the photo energy ( h ν) that is obtained by a certain conversion of the light transmittance Figure b shows the (α h ν) 1/2 curves calculated by DFT for the V O @TiO 2 , Fe Ti +V O @TiO 2 , and Fe Ti @TiO 2 systems, which have similar trends as the experimental curves that will be discussed in detail below.…”

Section: Resultsmentioning

confidence: 99%

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Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Yang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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Based on the superhydrophilicity of titanium dioxide (TiO 2 ) after ultraviolet irradiation, it has a high potential in the application of antifogging. However, a durable superhydrophilic state and a broader photoresponse range are necessary. Considering the enhancement of the photoresponse of TiO 2 , doping is an effective method to prolong the superhydrophilic state. In this paper, a Fe 3+ doped TiO 2 film with long-lasting superhydrophilicity and antifogging is prepared by sol−gel method. The experiment and density-functional theory (DFT) calculations are performed to investigate the antifogging performance and the underlying microscopic mechanism of Fe 3+ doped TiO 2 . Antifogging tests demonstrate that 1.0 mol % Fe 3+ doping leads to durable antifogging performance which lasts 60 days. The DFT calculations reveal that the Fe 3+ doping can both increase the photolysis ability of TiO 2 under sunlight exposure and enhance the stability of the hydroxyl adsorbate on TiO 2 surface, which are the main reasons for a longlasting superhydrophilicity of TiO 2 after sunlight exposure.

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Section: ■ Results and Discussionmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Yang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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“…Computational analysis of BiOX materials has shown that the valence band maximum (VBM) is largely composed of X np states, and the conduction band minimum (CBM) is mainly due to the Bi 6p state with minor contributions from X np states. ,, Therefore, while uplift of the VBM and downward shift of the CBM would be induced simultaneously during the doping process, the VBM is affected more significantly by the introduction of iodide. As a result, even a trace amount of I – dopant can drastically impact the VBM position leading to a reduced band gap …”

Section: Resultsmentioning

confidence: 99%

Visible-Light-Active Iodide-Doped BiOBr Coatings for Sustainable Infrastructure

Wang,

Quesada-Cabrera,

Sathasivam

et al. 2023

ACS Appl. Mater. Interfaces

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The search for efficient materials for sustainable infrastructure is an urgent challenge toward potential negative emission technologies and the global environmental crisis. Pleasant, efficient sunlight-activated coatings for applications in self-cleaning windows are sought in the glass industry, particularly those produced from scalable technologies. The current work presents visible-light-active iodide-doped BiOBr thin films fabricated using aerosol-assisted chemical vapor deposition. The impact of dopant concentration on the structural, morphological, and optical properties was studied systematically. The photocatalytic properties of the parent materials and as-deposited doped films were evaluated using the smart ink test. An optimized material was identified as containing 2.7 atom % iodide dopant. Insight into the photocatalytic behavior of these coatings was gathered from photoluminescence and photoelectrochemical studies. The optimum photocatalytic performance could be explained from a balance between photon absorption, charge generation, carrier separation, and charge transport properties under 450 nm irradiation. This optimized iodide-doped BiOBr coating is an excellent candidate for the photodegradation of volatile organic pollutants, with potential applications in self-cleaning windows and other surfaces.

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Pollutant template method synthesis of oxygen vacancy and template cavity riched TB-TiO2@MFA towards selective photodegradation of ciprofloxacin

Ren

et al. 2021

Applied Surface Science

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Physical spread and technical upshift in the band gaps of visible-light photocatalytic bismuth oxyhalide solid solutions

Cited by 7 publications

References 54 publications

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Visible-Light-Active Iodide-Doped BiOBr Coatings for Sustainable Infrastructure

Pollutant template method synthesis of oxygen vacancy and template cavity riched TB-TiO2@MFA towards selective photodegradation of ciprofloxacin

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Physical spread and technical upshift in the band gaps of visible-light photocatalytic bismuth oxyhalide solid solutions

Cited by 7 publications

References 54 publications

Superhydrophilic Fe3+ Doped TiO2 Films with Long-Lasting Antifogging Performance

Superhydrophilic Fe3+ Doped TiO2 Films with Long-Lasting Antifogging Performance

Visible-Light-Active Iodide-Doped BiOBr Coatings for Sustainable Infrastructure

Pollutant template method synthesis of oxygen vacancy and template cavity riched TB-TiO2@MFA towards selective photodegradation of ciprofloxacin

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Product

Resources

About

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance