Indium Ferrocyanide Tungsten Trioxide Thin Film

Tungsten oxide (WO₃) thin film is an ideal electrochromic and energy storage material due to its high contrast, good stability of crystal structure, strong environmental affinity and low cost. It is found that the smart window dual-function device based on the tungsten oxide film of indium ferrocyanide includes two conductive substrates as the working electrode and the reference electrode, one of which is coated with the tungsten oxide film on the surface of the conductive substrate to form the reference electrode structure, the other is coated with the indium ferrocyanide film on the surface of the conductive substrate to form the working electrode structure. The preparation steps of the film are as follows:

First, indium ferrocyanide thin films were prepared by electrodeposition and coating on transparent conductive fluorine doped tin oxide glass (FTO) with tin oxide glass as conductive substrate. The method of electrodeposition is cyclic voltammetry. The electrolyte consists of indium chloride, potassium ferrocyanide, potassium chloride and hydrochloric acid solution. The voltage range is 0.2V to 1.3V (relative to the saturated potassium chloride silver / silver chloride electrode), and the sweep rate is 0.2v/s. The number of scans is 3 to 10. After deposition, the working electrode can be obtained by washing it with distilled water;

Second, tungsten trioxide thin film was prepared by electrodeposition and coating on the surface of transparent conductive fluorine doped tin oxide glass (FTO). The electrodeposition method is constant voltage electrodeposition. The electrolyte consists of peroxytungstic acid and isopropanol aqueous solution. The deposition voltage is - 0.40 V (relative to saturated calomel electrode) and the deposition time is 15 minutes. After deposition, the reference electrode can be obtained by washing with distilled water and holding at 100 ℃ for 3 hours;

Third, the preparation of gel electrolyte. After mixing 2-acrylamine-2-methylpropanesulfonic acid, distilled water, tetraglycol diacrylate, benzoin methyl ether and potassium chloride, the polymer gel electrolyte containing hydrogen ion and potassium ion was obtained by polymerization initiated by ultraviolet irradiation.

Four, two pieces of FTO glass coated with indium ferrocyanide and tungsten trioxide were used as working electrode and reference electrode respectively, and the two glass electrodes were arranged face-to-face in parallel. The area of the two electrode films is the same. In order to avoid the contact between the two electrodes and to obtain a closed space, a viscous partition is provided between the two electrodes, and the polymer gel obtained is injected into the closed space as an electrolyte by an injection needle. Finally, the polymer gel layer can be obtained by sealing the holes left by injection with epoxy resin. Forming a battery smart window integrated device.

The electrochemical device not only has the characteristics of intelligent window, that is, it can adjust and control the light intensity, temperature, color and so on in the building through the action of external voltage (simultaneous injection or withdrawal of electrons and ions), but also can be used as energy storage device in the process of electrochromism to supply power to the electrical appliances in the building, so as to achieve multi-function.

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