Photoluminescence properties and photocatalytic activities of SiO2@TiO2:Sm3+ nanomaterials

Wu, Tonghao; Li, Jingyao; Chang, Meiqi; Song, Yanhua; Sun, Qi; Wang, Fangke; Zou, Haifeng; Shi, Zhan

doi:10.1016/j.jpcs.2020.109775

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…The surface adsorbed H 2 O molecules might be oxidized by the photogenerated holes to hydroxyl radicals (5) and the dissolved O 2 molecules might be reduced by the photogenerated electrons to superoxide radicals on the surface of the lm samples (6). Both of these radicals are highly active and can degrade any organic molecules into simple molecules like H 2 O and CO 2 (7) [41]. SiO 2 /WO 3 + hv → e − + h + (4) pure WO 3 lm samples, there was a signi cant enhancement in the photocatalytic activity of the composite lm samples (Fig.…”

Section: Uv-vis Spectrocopymentioning

confidence: 99%

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

Koysuren,

Dhoska,

Koysuren

et al. 2023

Preprint

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The accumulation of pollution and any kinds of contamination on the glass cover of the solar cell affects the efficiency of the photovoltaic (PV) systems. The contamination on the glass cover can absorb and reflect a certain part of the sunlight irradiation, which can decrease the intensity of the light coming in through the glass cover. With the study, it was planned to develop self-cleaning coatings for the PV systems. It was aimed to prevent or reduce the contamination-induced efficiency loss of the existing PV systems. In the scope of the project, SiO2/WO3 and SiO2/WO3/ZnO composites were coated from their solutions on the glass substrates using a dip-coating technique. WO3 was selected as a photocatalyst semiconductor. Under the UV light irradiation, WO3 could absorb the photons of the UV light, generating the photoinduced charge carriers. The photoexcited charge carriers provide both the photoinduced hydrophilicity on the surface of the coating and the photocatalytic degradation of the organic contaminants accumulated on the surface of the coating, which allows water droplets to spread and flow on the surface of the cover glass to remove the contaminations. However, the recombination rate of the photoexcited charge carriers on the WO3 film was high. In order to suppress the recombination of the photoinduced charge carriers, WO3 was coupled with SiO2 and ZnO. Both of these semiconductors improved the photocatalytic activity of the WO3 film. Although SiO2 has superior features in terms of the light transmission, it was not very effective under UV light as a photocatalyst alone. The widely preferred photocatalyst ZnO was added into the composite film structure to enhance the photocatalytic activity. The self-cleaning mechanism of the film coatings on a solar cell was investigated through the photocatalytic dye removal efficiency on the as-prepared film samples. There was a slight decrease in the light transparency and the solar cell efficiency because of the WO3 content of the composite film. On the other hand, coupling the SiO2/WO3 film with ZnO enhanced the photocatalytic activity, and it suppressed the reduction effect of the WO3 phase on both the light transparency and the solar cell efficiency. The photocatalytic dye removal efficiency was increased to over 90% after 240 min of UVA light irradiation. In addition, the solar cell coated with the SiO2/WO3/ZnO film provided almost the same solar cell efficiency as the uncoated solar cell. The water contact angle measurement also exhibited the photocatalytic degradation of the model contamination on the glass cover of the solar cell under the UVA light irradiation.

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Section: Uv-vis Spectrocopymentioning

confidence: 99%

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

Koysuren,

Dhoska,

Koysuren

et al. 2023

Preprint

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“…The TiO 2 –Al 2 O 3 –SiO 2 system is a promising base for a wide spectrum of glass–ceramic materials, which are important, for instance, in optical industry 1–3 and information technology, 4 for medical 5 and dental 6,7 applications, and for the development of refractories 8,9 and nanofillers in composite polymer electrolytes for lithium‐ion batteries 10 . A special attention is paid to ceramic films based on the TiO 2 –Al 2 O 3 –SiO 2 system, 11 which are considered as promising heat‐protecting coatings, 12 membranes for separation processes, 13,14 high‐κ dielectric materials in metal‐oxide‐semiconductor capacitors, 15 and interfacial layer in MoS 2 ‐based metallic filament memory 16 .…”

Section: Introductionmentioning

confidence: 99%

High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling

Stolyarova

Vorozhtcov

Shemchuk

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale The TiO2–Al2O3–SiO2 system is the base for various glass–ceramic materials, which have great practical value for a large number of modern technologies. Many TiO2–Al2O3–SiO2 materials are synthesized or applied at high temperatures, which justifies the relevance of the present study. Methods The samples in the TiO2–Al2O3–SiO2 system were synthesized using the method of induction melting in a cold crucible. The thermodynamic properties of the TiO2–Al2O3–SiO2 system were studied using the Knudsen effusion mass spectrometric method. The derived thermodynamic functions were optimized within the generalized lattice theory of associated solutions (GLTAS) approach and compared with the results of calculation using the semiempirical Kohler, Muggianu, Toop, Redlich–Kister, and Wilson methods based on the corresponding data in the binary systems. Results The SiO2 selective vaporization from the samples under study was shown at temperatures above 1940 K. The thermodynamic properties in the TiO2–Al2O3–SiO2 system, including the TiO2–SiO2 system, were obtained in the temperature range 1965–2012 K and were optimized using GLTAS to obtain the consistent concentration dependences of the component activities and excess Gibbs energies. Conclusions Positive deviations from the ideal behavior were observed in the TiO2–Al2O3–SiO2 system at high temperatures. Comparison of these values with the results of the modeling based on the GLTAS approach allowed the recommendations regarding the optimal semiempirical methods for the excess Gibbs energy calculation in different concentration ranges to be made.

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Flower ball MoS2 embedded in sheet-like Sm2WO6 to construct p–n heterojunction for photocatalytic hydrogen evolution

Li,

Xu,

et al. 2024

J Mater Sci: Mater Electron

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Photoluminescence properties and photocatalytic activities of SiO2@TiO2:Sm3+ nanomaterials

Cited by 10 publications

References 37 publications

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling

Flower ball MoS2 embedded in sheet-like Sm2WO6 to construct p–n heterojunction for photocatalytic hydrogen evolution

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Photoluminescence properties and photocatalytic activities of SiO2@TiO2:Sm3+ nanomaterials

Cited by 10 publications

References 37 publications

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

High‐temperature mass spectrometric study of thermodynamic properties in the TiO2–Al2O3–SiO2 system and modeling

Flower ball MoS2 embedded in sheet-like Sm2WO6 to construct p–n heterojunction for photocatalytic hydrogen evolution

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Product

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High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling