Abstract
Nickel oxide (NiO) Thin film was successfully deposited on the glass substrate using an inexpensive spray pyrolysis (SP) technique. The structural, morphological, and optical properties have been studied, thus the electrochemical behavior of NiO film in Alkaline electrolytes has been investigated. The X-ray diffraction (XRD) analysis showed that NiO thin film exhibit a polycrystalline cubic rock-salt structure with a preferential orientation on the plane (111). This result was confirmed using Raman spectroscopy. The Scanning Electron Microscopy (SEM) images exhibit a smooth and dense surface without major cracks. Optical analysis shows an average transmission of about 55% in the visible light range, and the optical band gap energy was estimated by Tauc’s method and showed a value of 3,71 eV. Electrochemical properties as specific capacitance (Csp), optical density variation (ΔOD), and Coloration efficiency (CE) were studied using cyclic voltammetry in 1M KOH and 1M NaOH electrolytes. The results indicated that the behavior of the NiO layer in KOH is more effective than in NaOH electrolytes.
Highlights
For several years, transition metal oxides have attracted a noticeable attention of researchers due to their promising characteristics for various application fields
The diffraction peaks observed at the 2θ diffraction angles 37,26°; 43,31° and 79,36° are attributed to the crystallographic planes (111), (200) and (222), respectively with a strong preferred orientation corresponding to the direction (111)
Using the International Center for Diffraction Data (ICDD) card number (04–0835), these peaks are indexed in a cubic rock-salt structure
Summary
Transition metal oxides have attracted a noticeable attention of researchers due to their promising characteristics for various application fields. Among these materials, nickel oxide (NiO) is an attractive material because of its good magnetic, thermal, optical, mechanical and, electrical performance [1], [2], [3]. NiO layers can be used in many applications, including photo-catalysts [8], optoelectronic devices [9], antiferromagnetic layers [10], solar cells [11], gas sensors [12], supercapacitors [13], and electrochromic devices [14]. NiO thin films can be used as Counter-electrode, which WO3 is the Work-electrode (WE) in electrochromic devices (ECDs) [15], due to its high coloration efficiency (CE), its fast switching between the decolored and colored states, its good cyclic reversibility and memory effect [16]
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