Investigation of the electrochromic properties of Ni(OH)2 films on glass with ITO­Ni bilayer coating

Authors

  • Valerii Kotok Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Federal State Educational Institution of Higher Education "Vyatka State University" Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Vadym Kovalenko Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Federal State Educational Institution of Higher Education "Vyatka State University" Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-8012-6732

DOI:

https://doi.org/10.15587/1729-4061.2018.133387

Keywords:

electrochromism, electrodeposition, thin films, Ni(OH)2, nickel, indium-tin oxide, nickel hydroxide

Abstract

Electrochromic films have been deposited onto glass coated with indium-tin oxide (ITO) and glass with ITO and a thin layer of metallic nickel deposited onto it. Nickel was deposited onto the surface of the ITO coating from nickel electroplating solution. The metallic nickel was deposited onto the surface of ITO at the following parameters – cathodic current density 0.5 A/dn2, deposition time 3 s. Such deposition parameters were chosen, because at longer deposition time and (or) higher current density, the deposited layer of metallic nickel became opaque. The two substrates were then used in the deposition of Ni(OH)2 electrochromic films using the cathodic template synthesis method. As a result, it was revealed that the electrochromic film deposited onto glass with ITO-Ni coating possesses higher specific characteristics than that deposited on bare ITO-coated glass: higher coloration degree and higher oxidation-reduction currents on the cyclic voltamperogram. However, it was also revealed that the film possessing better characteristics, on the contrary, has lower reversibility of the coloration-bleaching process. Based on the obtained data, the mechanism that explains the role of the intermediate metal layer was proposed. The mechanism is that the deposited layer of metallic nickel forms additional contacts between the substrate surface and the electrochromic film. The nickel layer can also assist in securing the electrochromic film, and during film deposition has a positive effect on current distribution. On the other hand, the lower reversibility of the coloration-bleaching process of the film on ITO-Ni coating can be explained by gradual oxidation of metallic nickel in the basic medium. At the same time, it was revealed that deposition of metallic nickel leads to some decrease of the substrate transparency.

Author Biographies

Valerii Kotok, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Federal State Educational Institution of Higher Education "Vyatka State University" Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Vadym Kovalenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Federal State Educational Institution of Higher Education "Vyatka State University" Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Analytical Chemistry and Food Additives and Cosmetics

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

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Published

2018-06-13

How to Cite

Kotok, V., & Kovalenko, V. (2018). Investigation of the electrochromic properties of Ni(OH)2 films on glass with ITO­Ni bilayer coating. Eastern-European Journal of Enterprise Technologies, 3(5 (93), 55–61. https://doi.org/10.15587/1729-4061.2018.133387

Issue

Vol. 3 No. 5 (93) (2018): Applied physics

Section

Applied physics

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Copyright (c) 2018 Valerii Kotok, Vadym Kovalenko

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