Effect of precipitating agent NaOH on the preparation of copper oxide nanostructures for electrochemical applications

Abstract

Copper oxide (CuO) nanostructures with different concentrations of sodium hydroxide for electrochemical applications such as supercapacitors have been synthesized using a simple and low-cost precipitation method. X-ray diffraction pattern confirmed the formation of CuO nanostructures without any impurities and further confirmed its highly crystalline, single phase, monoclinic nature. UV-diffuse reflectance spectral (UV-DRS) studies provided the absorption edge of the material and the estimated band gap value for the nanostructures were calculated using Kubelka-Munk (KM) absorbance plot that are determined to be around 4.74 -4.84 eV. Field emission scanning electron microscopy (FESEM) investigations revealed the morphology of the copper oxide nanocrystals and showed the increment of diameter of the CuO nanostructures. The electrochemical behavior of the CuO nanostructures were investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques which showed the stability, reversibility, symmetric and capacitive nature of the nanostructures.

BiFeO3-Montmorillonite intercalated nano composites - synthesis and its characterization

“…The electrochemical studies confirm the capacitance behavior of nano structured materials [42]. Baby Sunitha et.al [28] reported that o-toluidine polymerized with Montmorillonite by chemical oxidation method using potassium perdisulfate shows good solubility in both DMSO and DMF and the intercalation of the polymer in between the Montmorillonite clay layers increase in the d-spacing.…”

Spray Synthesized Mn‐doped CuO Electrodes for High Performance Supercapacitor

“…It means that Na 2+ ions from the electrolyte have plenty of time to diffuse at a lower scan rate and can reach the highest surface area of the active material [2,8] . The literature review compared with present work is shown in Table 1 [2,9,12–18] …”

“…[2,8] The literature review compared with present work is shown in Table 1. [2,9,[12][13][14][15][16][17][18] Furthermore, the specific capacitance performance for C 1 , MC 2 , MC 4 , and MC 6 electrodes is shown in Table 2.…”

“…reported the synthesis of CuO at different concentrations of NaOH by precipitation method and CuO (in 1.5 M NaOH) exhibited a specific capacitance of 759. 91 F/g in 1 M KOH electrolyte at 20 mV/s scan rate [17] . Dubal et al.…”

“…91 F/g in 1 M KOH electrolyte at 20 mV/s scan rate. [17] Dubal et al synthesized CuO cauliflower by potentiodynamic deposition and CuO multilayer nanosheets for supercapacitors with a specific capacitance of 179 F/g and 43 F/g in 1 M Na 2 SO 4 aqueous electrolyte respectively. [18] Lokhande et al deposited CuO nanostructured material by chemical deposition under thermal treatment and reported maximum specific capacitance of 184.58 F/g in 2 M KOH at 10 mV/s scan rate.…”