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Electrochromic and electrochemical properties of amorphous porous nickel hydroxide thin films |
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| Authors: | AI InamdarAC Sonavane SM PawarYoungSam Kim JH KimPS Patil Woong JungHyunsik Im Dae-Young KimHyungsang Kim |
| Institution: | a Department of Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea b Thin Films Materials Laboratory, Department of physics, Shivaji University, Kolhapur 416 004, India c Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea d Department of Biological & Environmental Science, Dongguk University, Seoul 100-715, Republic of Korea e Department of Physics, Dongguk University, Seoul 100-715, Republic of Korea |
| Abstract: | Nickel hydroxide films were prepared using the chemical bath deposition (CBD) technique. The amorphous nature of the films was confirmed by X-ray diffraction measurements. X-ray photoelectron spectroscopy (XPS) measurements showed that the films exhibited nickel hydroxide nature. The porosity of the films was studied using optical measurements. The electrochromic properties of the porous nickel hydroxide layers were investigated, using cyclic voltammetry, chronoamperometry, in situ transmittance, UV-vis spectroscopy, and impedance spectroscopy. The change in the optical density (ΔOD) was found to be 0.79 for the as-deposited nickel hydroxide films, whereas it is 0.53 and 0.50 for the films annealed at 150 °C and 200 °C, respectively. The in situ transmittance and chronoamperometry curves revealed that the annealed films had a very fast colouration (tc < 290 ms) and decolouration (tb < 130 ms). The measured colouration efficiencies range between 30 and 40 cm2/C. The impedance measurements revealed the faster colouration and good electrochromic properties for the annealed nickel hydroxide films. |
| Keywords: | Nickel hydroxide Electrochromism Cyclic voltammetry Chronoamperometry UV-vis spectroscopy Impedance spectroscopy |
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