Abstract
In this study, we propose changes to the cell design in order to reduce the cost of electrochromic devices. The modification lies in the replacement of the second electrochromic layer along with its conductive layer with the mesh metal-oxide electrode. This variant of the electrochromic device is proposed to be installed in light windows and upper parts of view windows. For the proposed mesh electrode, a few possible electrochemical systems were proposed: Cu|Cu 2 O, Zn|ZnO, Ni|NiO and Ag|AgO. By means of cyclic voltammetry, the working parameters of these systems were found – working potential windows and specific peak current. Based on the obtained data, the silver electrode proved to be the most promising. The chosen electrode was studied by means of cyclic voltammetry and galvanostatic cycling. It was found that the specific capacity of the silver electrode does not have a strong dependence on the current density of oxidation and reduction. Minimum and maximum specific capacities of the studied electrode were found, which in 0.1 M КОН were 0.075 mA·h/cm 2 (cyclic voltammetry) and 0.082–0.042 mA·h/cm 2 (galvanostatic cycling). It was also found that during electrochemical cycling in 0.1 M KОН, the following transformations occur Ag↔Ag 2 O and Ag 2 O↔AgO. Based on the obtained data, at the specific capacity of the main (electrochromic) electrode of 0.011 mA·h/cm 2 , it is proposed to use a mesh with a 2x2 cell and wire diameter of 0.5 mm. It was found that the cost of the silver mesh can be decreased by using a silver plated copper mesh instead.
Highlights
Для запропонованого сітчастого електроду були обрані декілька електрохімічних систем, що можуть бути потенційно використані, а саме: Cu|Cu2O, Zn|ZnO, Ni|NiO та Ag|AgO
It is known that the use of horizontal “smart windows” results in the greatest power saving among all possible window orientations [6, 7]
Because there is no information on characteristics of these systems under required conditions, the aim was set to evaluate specific capacities and conduct comparative analysis. Such analysis could help to find systems that could potentially be used in the developed design of the electrochromic device (Fig. 2)
Summary
“Smart windows” are devices that can controllably alter their optical properties: transparency, color, transmittance and reflection coefficient. The core of these “smart windows” are electrochromic films, in which electrochemical reactions occur. They can be used in construction, aviation and automobile industries to provide visual control. They can be used in hospitals for patient examination rooms and to create a private atmosphere in business centers and meeting rooms [2]. Less power is required for air conditioning. These windows would lower power consumption in “peak” periods and for lighting [3]. The search for technologies that would lower their cost becomes key for the scientific field
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