Band restructuring of ordered/disordered blue TiO<sub>2</sub> for visible light photocatalysis

Oh, Simgeon; Kim, Jihee; Hwang, Hee Min; Kim, Doyoung; Kim, Joosung; Park, G. Hwan; Kim, Joon Soo; Lee, Young Hee; Lee, Hyoyoung

doi:10.1039/d0ta11505c

Cited by 17 publications

(12 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure S5a displays the Ti 2p spectral binding energy region, in which the characteristic peaks at 458.9 and 464.6 eV are ascribed to Ti 2p 3/2 and Ti 2p 1/2 , respectively. 40 The characteristic peaks at 37.8 and 35.7 eV are ascribed to W 4f 5/2 and W 4f 7/2 at Figure S5b, respectively. 41 Using the multi-Gaussian function, the Ti signal can be deconvoluted into Ti 3+ and Ti 4+ , which confirms the presence of oxygen vacancies.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…The survey X-ray photoelectron spectroscopy (XPS) spectrum contains the signals of Ti, W, O, and C elements (Figure S4). Figure S5a displays the Ti 2p spectral binding energy region, in which the characteristic peaks at 458.9 and 464.6 eV are ascribed to Ti 2p 3/2 and Ti 2p 1/2 , respectively . The characteristic peaks at 37.8 and 35.7 eV are ascribed to W 4f 5/2 and W 4f 7/2 at Figure S5b, respectively .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Zhao

Zhang

Liu

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Excessive exposure to ultraviolet (UV) rays in sunlight is harmful to human skin. The development of an intelligent UV monitor that can detect the solar UV intensity in real time is highly desirable for human health and safety. In this work, a sunlight-responsive paper-based color-switching film (PCSF) is developed by combining color-switchable titania/hydrated tungsten oxide (THTO) heteronanoparticles with a sticker paper substrate. The THTO heteronanoparticles with an average size of 10 nm are distributed tightly on the surface of the paper substrate. Owing to the advantages of the excellent sensitivity and selectivity to solar UV radiation of THTO heteronanoparticles and the high flexibility of the paper substrate, the PCSF shows great potential for solar UV radiation monitors. With the solar UV intensity increasing from 0.75 to 3.25 mW•cm −2 , the color of PCSF changes from colorless to blue and even dark blue. Moreover, the color change of the PCSF under solar UV irradiation featuring 40 s is calibrated to indicate the solar UV radiation intensity. Taking the advantage of the excellent sensitivity and selectivity to solar UV radiation, high reversibility, flexibility, and low cost, we further demonstrate the application of the PCSF as a reusable wristband for smart solar UV radiation monitors. This work provides a way for solar UV radiation monitors that could provide naked-eye monitoring of real-time personal solar UV radiation.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Zhao

Zhang

Liu

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…[ 35 ] In addition, in the case of most studied inorganic semiconductors, black TiO 2 nanoparticles mostly have a crystalline core and disordered shell morphology, which limits their ability to harvest solar light. To minimize this issue, our group previously developed a disorder‐engineered P25 TiO 2 , [ 36–38 ] which contained an order‐anatase/disorder‐rutile junction. This heterostructure efficiently internally separated electrons/holes through type‐II bandgap alignment, leading to enhanced photo H 2 evolution compared with black TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Unveiling a Three Phase Mixed Heterojunction via Phase‐Selective Anchoring of Polymer for Efficient Photocatalysis

Jadhav

Bui

Cho

et al. 2022

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

because solar energy is freely available and hydrogen fuel is clean with high gravimetric energy density. For practical applications, it is very important to develop a low-cost water-splitting photocatalyst with an ≈10% solar-to-hydrogen energy conversion. [4] Nearly half of the energy in the sunlight that reaches Earth's surface comes from visible light photons (400-700 nm); therefore, it is important to develop a visible light active photocatalyst for efficient solar-to-fuel conversion. [5] Most of the research on photocatalysts has focused on wide bandgap semiconductors, such as TiO 2 , [6][7][8] SrTiO 3 , [9,10] and carbon nitride (CN). [11][12][13] Some of these photocatalysts have achieved very good operation stabilities that surpass 1000 h, along with more than 50% maximum external quantum efficiency for watersplitting reactions. [14][15][16] However, the wide and difficult-to-tune bandgaps of such photocatalysts restrict light absorption to only the ultraviolet (UV) region and thus fundamentally limit the practical applications for solar light harvesting to fuel. [16,17] Therefore, novel photocatalyst semiconductor materials with narrower bandgaps that can absorb a greater proportion of solar spectrum are needed to achieve the maximum theoretical solar energy conversion efficiency for practical applications.The ligand-to-metal charge transfer (LMCT) facilitated activation of TiO 2 has noteworthy potential for solar energy harvesting. However, the fast back electron transfer from TiO 2 to an oxidized sensitizer is a key limiting factor causing low photocatalyst efficiency. Herein, a new catalyst design to both increase LMCT efficiency and minimize the back electron transfer is presented. A phase-selective modification of mixed-phase TiO 2 (anatase: rutile interface) with poly-salophen organic polymer is developed. The salophen and salen family organic monomers are selectively bound and polymerized on the anatase phase but not the rutile phase, which results in the formation of a three-phase system. Such a three-phase system converts an unfavorable polymer TiO 2 core-shell structure to an intimately mixed blend morphology, consisting of interfaced crystalline rutile TiO 2 and an amorphous polymer-covered anatase-phase TiO 2 . The developed mixed-blend morphology poly-S@P25 can produce H 2 of 37 410 µmol h -1 g -1 of polymer, which is ≈3.4 times higher than core-shell poly-S@anatase TiO 2 . This approach overcomes the drawback of the traditional core-shell structured system for efficient electron harvesting from the LMCT process.

show abstract

“…However, most of the commonly used semiconductor photocatalysts are powders, which are small in size and light in specific gravity. 30,31 They are difficult to separate, recycle, and reuse by conventional methods, such as filtration, precipitation and flocculation. Furthermore, the powder particles in the nano-dispersion system will block the light source during the reaction process and affect the radiation depth of the light source, thus affecting the photocatalytic efficiency, which makes it difficult to effectively promote the industrial application of powder photocatalytic materials on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of a Z-scheme AgI/Ag₆Si₂O₇ heterojunction to PET fabric for efficient and repeatable photocatalytic dye degradation

et al. 2022

View full text Add to dashboard Cite

show abstract

Band restructuring of ordered/disordered blue TiO₂ for visible light photocatalysis

Abstract: We performed a band modulation of the phase-selectively disordered rutile P25 TiO2 and disordered anatase P25 TiO2 and their band structures were confirmed by transient absorption spectroscopy.

Cited by 17 publications

References 51 publications

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Unveiling a Three Phase Mixed Heterojunction via Phase‐Selective Anchoring of Polymer for Efficient Photocatalysis

Incorporation of a Z-scheme AgI/Ag₆Si₂O₇ heterojunction to PET fabric for efficient and repeatable photocatalytic dye degradation

Contact Info

Product

Resources

About

Band restructuring of ordered/disordered blue TiO2 for visible light photocatalysis

Abstract: We performed a band modulation of the phase-selectively disordered rutile P25 TiO2 and disordered anatase P25 TiO2 and their band structures were confirmed by transient absorption spectroscopy.

Cited by 17 publications

References 51 publications

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Unveiling a Three Phase Mixed Heterojunction via Phase‐Selective Anchoring of Polymer for Efficient Photocatalysis

Incorporation of a Z-scheme AgI/Ag6Si2O7 heterojunction to PET fabric for efficient and repeatable photocatalytic dye degradation

Contact Info

Product

Resources

About

Band restructuring of ordered/disordered blue TiO₂ for visible light photocatalysis

Incorporation of a Z-scheme AgI/Ag₆Si₂O₇ heterojunction to PET fabric for efficient and repeatable photocatalytic dye degradation