Özet:

Obtaining new types of composite coatings for various purposes is the most important direction in chemistry. The synthesis of composite hydroxide-sulfide compounds can be useful in various areas of applied electrochemistry. Using a simple two-step method, thin films composed of nickel hydroxide sulfide-polyvinyl alcohol were formed. The production of nickel hydroxide sulfide-polyvinyl alcohol composite was carried out by holding the nickel hydroxide-polyvinyl alcohol composite coating formed on the glass electrode with an electrically conductive substrate in a solution of 0.03 M Na2S for 10 minutes. The formation of nickel sulfide on the surface of nickel hydroxide was shown indirectly. It was shown that there were no changes in morphology after the treatment of the electrode in sodium sulfide solution. As a result of the treatment, the electrochemical and electrochromic characteristics changed. There was some deterioration in the average coloration depth from 55 % to 49 % for the electrode containing nickel sulfide. The electrochemical characteristics also deteriorated slightly after the formation of the sulfide film, namely, the specific capacitance, which went to the passage of anodic and cathodic processes. However, the capacitance efficiency increased from 83 % to 87 % for the sulfide-treated film. Despite this, this simple method is considered to be potentially promising for the formation of electrodes for use in other electrochemical devices. In addition, due to the treatment in a sodium sulfide solution, it became possible to roughly determine the size of the nickel hydroxide clusters in the nickel hydroxide-polyvinyl alcohol composite coating. These clusters did not exceed 430 nm in size, which was almost equal to the lower limit of the wavelength of the visible spectrum. Author Biographies Valerii Kotok, Ukrainian State University of Chemical Technology PhD, Associate Professor Department of Processes, Apparatus and General Chemical Technology

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