Studies on Electrochromism of Chemically Deposited Nickel Oxide Thin Films
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Abstract
In this work, nickel oxide (NiOx) thin films were prepared from aqueous solution of nickel nitrateand carbamide. Those films were deposited onto fluorine doped tin oxide (FTO) coated glass substrates. Anelectrochromic test device (ECTD) was constructed by using these films as working electrodes, and FTOcoated glass as an opposite electrode in alkaline medium of 0.1 M NaOH aqueous solution. The obtainednickel oxide films exhibited anodic electrochromism, changing color from transparent to dark brown. Varioustechniques were used for characterization of the films as x-ray diffraction (XRD), visible spectroscopy andelectrochemical methods. The dependence of the optical density on the charge density was examined and thecoloration efficiency was calculated from the optical density change. The time response was also determined.
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