The determination of electrolyte stability and conditions for electrochromic WO3 films deposition

Authors

DOI:

https://doi.org/10.15587/2312-8372.2017.105473

Keywords:

tungsten trioxide, electrochromic film deposition, peroxotungstic acid, potential window

Abstract

The present research is devoted to finding the condition and intricacies of WO3 film electrodeposition from peroxotungstic acid-based electrolyte that can be used for real production process. For deposition of electrochromic WO3 films, the galvanostatic regime with following parameters is proposed: cathodic current density -0.2 mA/cm2, deposition time 30 min. The films prepared under such deposition parameters are transparent and had good adhesion to the substrate – the glass coated with fluorine-doped tin oxide. The averaged coloration degree for film deposited from fresh electrolyte is 10%, while for film deposited from regenerated electrolyte – 5 %. During investigation, the potential window in which WO3 film could be colored and bleached, without reduction of SnO2 to metallic tin is established. It is also demonstrated that electrolytes containing peroxotungstic acid are unstable and degrade over time. It is proposed to use hydrogen peroxide for regeneration of electrolyte. It is demonstrated that electrolyte can be partially regenerated with hydrogen peroxide.

Author Biographies

Valerii Kotok

PhD, Associate Professor,

Department of Processes, Apparatus and General Chemical Technology,

Ukrainian State University of Chemical Technology,

8, Gagarina ave., Dnipro, Ukraine, 49005;

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing,

Federal State Educational Institution of Higher Education «Vyatka State University»,

36, Moskovskaya str., Kirov, Russian Federation, 610000

Vadym Кovalenko

PhD, Associate Professor,

Department of Analytical Chemistry and Food Additives and Cosmetics,

Ukrainian State University of Chemical Technology,

8, Gagarina ave., Dnipro, Ukraine, 49005;

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing,

Federal State Educational Institution of Higher Education «Vyatka State University»,

36, Moskovskaya str., Kirov, Russian Federation, 610000

 

Vitalii Solovov, Ukrainian State University of Chemical Technology, 8, Gagarina ave., Dnipro, Ukraine, 49005

Postgraduate Student

Department of Analytical Chemistry and Food Additives and Cosmetics

Olga Yurlova, Federal State Educational Institution of Higher Education «Vyatka State University», 36, Moskovskaya str., Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Foreign Languages Nonverbal Areas

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Published

2017-05-30

How to Cite

Kotok, V., Кovalenko V., Solovov, V., & Yurlova, O. (2017). The determination of electrolyte stability and conditions for electrochromic WO3 films deposition. Technology Audit and Production Reserves, 3(3(35), 17–22. https://doi.org/10.15587/2312-8372.2017.105473

Issue

Vol. 3 No. 3(35) (2017): Chemical Engineering

Section

Chemical and Technological Systems: Original Research

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Copyright (c) 2017 Valerii Kotok, Vadym Кovalenko, Vitalii Solovov, Olga Yurlova

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