A study of multilayered electrochromic platings based on nickel and cobalt hydroxides
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 12
Abstract
The multilayered electrochromic films based on Ni(OH)<sub>2</sub> and Co(OH)<sub>2</sub> have been prepared using sequential cathodic template deposition for solutions containing polyvinyl alcohol, nickel nitrate and cobalt nitrate at a current density of 0.625 mA/cm<sup>2</sup>. The prepared films have demonstrated electrochemical activity and high electrochromic properties – coloration degree 25–80 %, high reversibility during cycling. The prepared films had a large number of structural defects and, possibly, large amounts of structural water, determined from them being X-ray amorphous. All the films had demonstrated similar electrochemical characteristics, except for the film composed of three layers of Ni(OH)<sub>2</sub>, Co(OH)<sub>2 </sub>and Ni(OH)<sub>2</sub>. The best electrochromic characteristics had been demonstrated by the film prepared by consecutive deposition from solutions with polyvinyl alcohol containing nickel nitrate and cobalt nitrate for 2 and 78 minutes, respectively: coloration degree of 80 %, rectangular shape of the coloration-bleaching curve. A simple mechanism has been proposed, which describes better electrochromic characteristics of this film. It consists in the oxidation of cobalt hydroxide to CoOOH, which can act as an electrically conductive bridge between the substrate and the Ni(OH)<sub>2 </sub>layer
Authors and Affiliations
Valerii Kotok, Vadym Kovalenko
Keywords
Related Articles
- EP ID EP527834
- DOI 10.15587/1729-4061.2018.121679
- Views 73
- Downloads 0
Increasing efficiency of plasma hardening by local cooling of surface by air with negative temperature
<p>The martensitic transformation interval of some hypoeutectoid, all eutectoid and all hypereutectoid steels covers to a large extent the region of negative temperatures. Due to the fact that the plasma hardening operat...
Prediction of spot welding parameters using fuzzy logic controlling
<p>The Resistance Spot Welding (RSW) represents one of the most important welding processes. The resistance spot welding quality depends on the process parameters like welding current, electrode force and welding time an...
Development of a decontamination system for decomposing N-(phosphonomethyl)glycine
<p>The study has specified the influence of activators on the decomposition of N-(phosphonomethyl)glycine under the effect of hydrogen peroxide and potassium hydroxide. As decontamination systems, potassium hydroxide, hy...
Mathematical modeling of autonomous underwater vehicle propulsion and steering complex operation in oblique (beveled) water flow
<p>The research of nonlinear hydrodynamic characteristics of the propulsion and steering complex (PSC), which influence the accuracy of the plane trajectory motion of an autonomous underwater vehicle (AUV), is carried ou...
Research into effectiveness of cavitation cleaning of wastewater of a fatandoil plant from organic and biological contamination in the presence of various gases
<p>The use of cavitation technologies for the processes of cleaning wastewater from a fat-and-oil plant is one of the promising methods for enhancing water quality indicators. The supply of gases of different nature, suc...