Synthesis, Characterization and Sensing Behavior of WO<sub>3</sub> Nanocrystalline Powder for Toluene Vapor

Boran, Filiz; Çetinkaya, Sevil

doi:10.12693/aphyspola.132.572

“…The peak present at 515 cm − 1 might belong to the Zn-O stretching vibrations [32]. Characteristic peaks of WO 3 due to the W = O stretching bond and the O-W-O stretching bond are present at 620 cm − 1 and 806 cm − 1 , respectively, on the same spectrum [31]. On the spectrum, there are additional peaks at 871 cm − 1 , 1624 cm − 1 , 3445 cm − 1 and 3512 cm − 1 , which were attributed to the stretching vibration of hydroxyl compounds [29,32,33].…”

Section: Ftir Analysismentioning

confidence: 88%

“…1d, FTIR absorbance spectrum of the composite lm sample con rmed the successful synthesis of both SiO 2 and WO 3 together. The characteristic absorbance peaks of WO 3 were observed at 667 cm − 1 and 966 cm − 1 , assigned to the W = O stretching bond [31]. The spectrum also presents the characteristic peak of WO 3 at 957 cm − 1 , belonging to the stretching of short W = O bonds of WO 3 .H 2 O.…”

Section: Ftir Analysismentioning

confidence: 92%

“…On the FTIR spectrum of pure WO 3 lm (Fig. 1b), there is a broad absorbance band at around 590 cm − 1 and a sharp absorbance peak at around 800 cm − 1 , which were attributed to the W = O stretching bond and the O-W-O stretching bond, respectively [31]. FTIR spectrum of pure ZnO lm illustrates characteristic peak of ZnO at 482 cm − 1 and 555 cm − 1 , which were attributed to the Zn-O stretching vibrations (Fig.…”

Section: Ftir Analysismentioning

confidence: 99%

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

Koysuren,

Dhoska,

Koysuren

et al. 2023

Preprint

0

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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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“…53 Metals generally show absorption bands in the fingerprint region, i.e., below 1000 cm À1 arising from interatomic vibrations. 55,56 3.7. Electrochemical surface area determined by EDLC Cyclic voltammetry was used to estimate the electrochemical surface area (ECSA) of the as-prepared composite.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

FeS₂ and WO₃ nanoparticles decorated on biochar as a high throughput electrode for supercapacitors

Waris,

Abdulaziz,

Latif

et al. 2023

Phys. Chem. Chem. Phys.

2

0

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SiO2/WO3/ZnO based self-cleaning coatings for solar cells

Koysuren,

Dhoska,

Koysuren

et al. 2024

J Sol-Gel Sci Technol

1

0

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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. Graphical Abstract

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Synthesis, Characterization and Sensing Behavior of WO₃ Nanocrystalline Powder for Toluene Vapor

Cited by 6 publications

References 9 publications

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

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

FeS₂ and WO₃ nanoparticles decorated on biochar as a high throughput electrode for supercapacitors

SiO2/WO3/ZnO based self-cleaning coatings for solar cells

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Synthesis, Characterization and Sensing Behavior of WO3 Nanocrystalline Powder for Toluene Vapor

Cited by 6 publications

References 9 publications

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

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

FeS2 and WO3 nanoparticles decorated on biochar as a high throughput electrode for supercapacitors

SiO2/WO3/ZnO based self-cleaning coatings for solar cells

Contact Info

Product

Resources

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Synthesis, Characterization and Sensing Behavior of WO₃ Nanocrystalline Powder for Toluene Vapor

FeS₂ and WO₃ nanoparticles decorated on biochar as a high throughput electrode for supercapacitors