Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/3780
Title: Structural, electrochemical and optical comparisons of tungsten oxide coatings derived from tungsten powder-based sols
Authors: Isık, Dilek
Ak, Metin
Durucan, Caner
Keywords: Tungsten compounds
Electrochromism
Tungsten trioxide
Electrochemistry
Electrochromic materials
Electrochromic coatings
Peroxotungstic acid
Tungsten oxide
Amorphous coating
Calcination temperature
Coated glass substrates
Coloration efficiencies
Crystalline coatings
Crystallinities
Electrochromic coating
Publisher: Elsevier B.V.
Abstract: Tungsten trioxide (WO3) electrochromic coatings have been formed on indium tin oxide-coated glass substrates by aqueous routes. Coating sols are obtained by dissolving tungsten powder in acetylated (APTA) or plain peroxotungstic acid (PTA) solutions. The structural evolution and electrochromic performance of the coatings as a function of calcination temperature (250 °C and 400 °C) have been reported. Differential scanning calorimetry and X-ray diffraction have shown that amorphous WO3 films are formed after calcination at 250 °C for both processing routes; however, the coatings that calcined at 400 °C were crystalline in both cases. The calcination temperature-dependent crystallinity of the coatings results in differences in optical properties of the coatings. Higher coloration efficiencies can be achieved with amorphous coatings than could be seen in the crystalline coatings. The transmittance values (at 800 nm) in the colored state are 35% and 56% for 250 °C and 400 °C-calcined coatings, respectively. The electrochemical properties are more significantly influenced by the method of sol preparation. The ion storage capacities designating the electrochemical properties are found in the range of 1.62-2.74 × 10- 3 (mC cm- 2) for APTA coatings; and 0.35-1.62 × 10- 3 (mC cm- 2) for PTA coatings. As a result, a correlation between the microstructure and the electrochromic performance has been established.
URI: https://hdl.handle.net/11499/3780
ISSN: 0040-6090
Appears in Collections:Fen-Edebiyat Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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