Determination of the effect of exposure conducted in KOH solutions at different temperatures on the properties of electrochromic Ni(OH)2-PVA films

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.239151

Keywords:

electrochromism, electrodeposition, nickel hydroxide, temperature, potassium hydroxide, recrystallization, aging, degradation

Abstract

To determine the effect of exposure of film composite electrodes based on Ni(OH)2-polyvinyl alcohol to an alkaline solution at high temperatures on the electrochromic and electrochemical characteristics, a series of films was obtained. The films were obtained on a glass substrate coated with fluorine-doped tin oxide. The coating of the substrates was carried out by the cathodic template method under the same conditions. The resulting precipitates were treated by keeping them in an alkali solution at different temperatures: 30, 40, 50, 60, and 70 °C for 8 hours, thereby simulating the operating conditions of an electrochromic device in a hot climate.

It was found that the exposure temperature directly affected the electrochemical and electrochromic properties of the treated films. In this case, the cyclic volt-ampere curves showed a decrease in the peak values of the current densities and a lower rate of establishment of characteristics with an increase in the treatment temperature. At a maximum treatment temperature of 70 °C, the properties of the film significantly changed towards deterioration.

According to the results of the experiments, three temperature ranges of treatment were identified. The first one was in the range up to 40 °C, in which the films showed significant electrochromic and electrochemical activity after treatment. The second interval was between 40 and 60 °C, in which the coatings showed a reversible deterioration in electrochromic and electrochemical activity. After treatment in the second interval, the films gradually restored their performance during electrochemical cycling. The third interval was from 70 °C and above. The films treated in this temperature range irreversibly lost their electrochemical and electrochromic activity.

The study also proposed mechanisms to explain changes in the characteristics of electrodes during treatment, as well as possible ways to combat temperature degradation.

Author Biographies

Valerii Kotok, Ukrainian State University of Chemical Technology; Vyatka State University

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Senior Researcher

Competence Center "Ecological Technologies and Systems"

Vadym Kovalenko, Ukrainian State University of Chemical Technology; Vyatka State University

PhD, Associate Professor

Department of Analytical Chemistry and Chemical Technology of Food Additives and Cosmetics

Senior Researcher

Competence Center "Ecological Technologies and Systems"

Rovil Nafeev, State University of Telecommunications

PhD, Associate Professor

Department of Physics

Volodymyr Verbitskiy, National Pedagogical Dragomanov University

Doctor of Pedagogical Sciences, Professor

Department of Medical, Biological and Valeological Basics of Life and Health Protection

Elena Lominoga, Ukrainian State University of Chemical Technology

Lecturer

Department of Pharmacy and Technology of Organic Substances

Olena Melnyk, Sumy National Agrarian University

PhD, Associate Professor, Senior Researcher

Research Coordination Office

Sergey Vlasov, Dnipro University of Technology

Doctor of Technical Sciences, Professor

Department Mining Engineering and Education

Iryna Plaksiienko, Poltava State Agrarian Academy

PhD, Associate Professor

Department of Ecology, Sustainable Nature Management and Environmental

Larisa Kolesnikova, Poltava State Agrarian Academy

PhD, Associate Professor

Department of Ecologe, Sustainable Nature Management and Environmental Protection

Volodymyr Kalinichenko, Poltava State Agrarian Academy

PhD

Department of Ecologe, Sustainable Nature Management and Environmental Protection

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Published

2021-08-31

How to Cite

Kotok, V., Kovalenko, V., Nafeev, R., Verbitskiy, V., Lominoga, E., Melnyk, O., Vlasov, S., Plaksiienko, I., Kolesnikova, L., & Kalinichenko, V. (2021). Determination of the effect of exposure conducted in KOH solutions at different temperatures on the properties of electrochromic Ni(OH)2-PVA films. Eastern-European Journal of Enterprise Technologies, 4(6(112), 60–66. https://doi.org/10.15587/1729-4061.2021.239151

Issue

Vol. 4 No. 6(112) (2021): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

License

Copyright (c) 2021 Valerii Kotok, Vadym Kovalenko, Rovil Nafeev, Volodymyr Verbitskiy, Elena Lominoga, Olena Melnyk, Sergey Vlasov, Iryna Plaksiienko, Larisa Kolesnikova, Volodymyr Kalinichenko

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