Facial synthesis of K0·3WO3/Ag nanocomposites for self-cleaning energy efficient window coatings

Gao, Qiang; Wu, Xiaomei; Cai, Ligang

doi:10.1016/j.jallcom.2020.157069

Cited by 7 publications

(6 citation statements)

References 54 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].…”

Section: Uv-vis Spectrocopymentioning

confidence: 99%

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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%

“…In the literature, different semiconductor photocatalysts such as TiO 2 [4], ZnO [2], KWO 3 [5] and Bi 2 O 2 CO 3 [6] have been used to develop self-cleaning coatings based on the photocatalytic activity. Several studies from the literature have been summarized on Table 1.…”

Section: Introductionmentioning

confidence: 99%

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

Koysuren,

Dhoska,

Koysuren

et al. 2023

Preprint

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“…The relative solar modulation capabilities and optical variance at 2500 nm, which are crucial indices to indicate VO 2 's phase transition feature, were computed together with the periodic transmittance measurements to assess the stability of VO 2 films. The life span of the fabricated VO 2 /HfO 2 composite film was estimated using the Hallberg and Peck acceleration factor defined by equation (8). 147…”

Section: Thermochromic Property Of Vo 2 and Self-cleaningmentioning

confidence: 99%

“…6 VO 2 has also been doped with other metals or metal composites to improve its self-cleaning functionality. 4,7,8 The doping resulted in better optical properties, improved photodegradation characteristics, and excellent hydrophilicity. These made them more suitable for energy saving and smart window uses.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of vanadium dioxide thin films and application of its thermochromic and photochromic nature in self-cleaning: A review

Lukong

Ukoba

Jen

2022

Energy & Environment

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Vanadium dioxide (VO2) and many binary compounds of vanadium can transform from a semiconducting state to a metallic state under the influence of temperature or light. The transformation is triggered by modifications in the oxide's crystalline structure, often initiated by changes in its light-sensing and electrical attributes. This ability makes them suitable for smart coatings, electronic switches, self-cleaning surfaces, window glass, and many more. These potential applications have prompted tremendous interest in VO2thin films, focusing on their fabrication and application. This article reviews current fabrication methods for VO2thin films, the potential application of their thermochromic and photochromic properties in self-cleaning coatings, the challenges facing their application, and some remedies devised to address the challenges. The various challenges facing its different synthesis and fabrication methods are also highlighted. First, the different transitional phases of VO2and routes to transform from one stage to the other are presented.

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“…Transition metal oxide coatings exhibit superhydrophilicity, and they are widely applied to manufacture selfcleaning glass [1]. Among the others transitional metal oxides(NiO, ZnO and Fe 2 O 3 ), TiO 2 has drawn attention very much around the world because of its various properties such as excellent photocatalytic activity, electronic and chemical property, high stability, low toxic and cheap.…”

Section: Introductionmentioning

confidence: 99%

Transparent superhydrophilic metal oxide coating with mechanical and chemical robustness for photocatalytic self-cleaning applications

Hossain,

Lee,

Kim

2023

Phys. Scr.

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A photoactive TiO2-KH550 (3-aminopropyltriethoxysilane) - PEG (Polyethelyneglycol) coating film with excellent superhydrophilicity is deposited on a glass substrate by means of the dip coating method for self-cleaning applications. The effects of the number of coating layers, molecular weight of PEG (200–8000), surface roughness, and film thickness on the hydrophilicity of the film coated on the glass substrate are analyzed. In addition, the mechanical durability, and thermal and chemical stability of the coated film are studied. The tribological properties (friction coefficient and wear track) of the film coated on the glass substrate are investigated. The photo-catalyzed self-cleaning properties of the film are also evaluated. In addition, the effect of withdrawal speed on the optical properties (transmittance) of the film are investigated by obtaining and analyzing its UV spectra. The results indicated that the hydrophilicity of the TiO2 coating film decreased as its surface roughness and thickness increased. The TiO2-KH550-PEG coating fabricated using PEG with a low molecular weight of 400 exhibited a smooth and uniform morphology. The composite TiO2 coating film prepared herein exhibited excellent mechanical durability in a sandpaper abrasion test and retained its superhydrophilicity under harsh chemical conditions (strong acidic and basic media). The coated glass substrate presented superior wear resistance compared to that of the uncoated glass substrate. Moreover, the transparent TiO2 composite film coating exhibited excellent photocatalytic self-cleaning properties. Therefore, it is expected that the TiO2 composite film coated on glass has good potential for use in applications such as window glasses, architectural buildings, and photovoltaic modules.

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Facial synthesis of K0·3WO3/Ag nanocomposites for self-cleaning energy efficient window coatings

Cited by 7 publications

References 54 publications

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

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

Fabrication of vanadium dioxide thin films and application of its thermochromic and photochromic nature in self-cleaning: A review

Transparent superhydrophilic metal oxide coating with mechanical and chemical robustness for photocatalytic self-cleaning applications

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