Controlled synthesis, structural, morphological and electrochemical study of Cu(OH)2@Cu flexible thin film electrodes prepared via aqueous-non-aqueous routes

Copper oxide is one of the cheapest transition metal oxides used in the electrode preparation. Present work is focused on the preparation of Cu(OH)(2)@Cu flexible thin film electrodes (FTFEs) via aqueous and non-aqueous routes by self anodization and their comparative analysis by electrochemical analyzer for capacitive behavior. In this work, electrodes get prepared using different dispersion media at different deposition potentials by anodic electrodeposition technique. Electrodeposition was carried out on flexible Cu plates in 20 ml solution of 1 M NaOH dispersed in different medias viz. water, methanol and ethanol. These FTFEs were analyzed for structural and morphological analysis by using X-ray diffraction which confirms cubic crystal structure for all samples. All deposited electrodes exhibit hydrophilic nature. Cyclic voltammetry (CV) of these electrodes has been carried out in 1 M NaOH electrolyte. Only the electrode deposited at deposition potential 0.9 V via aqueous route exhibits good electrochemical stability and highest specific capacitance 604 F/g in 1 M NaOH at 2 mV/s. Galvanostatic charge-discharge behavior was studied to estimate specific energy (SE), specific power (SP), specific capacitance and columbic efficiency (eta). Present work is important to understand the easy synthesis and suitable dispersive media for deposition of hydroxide phase of copper for better electrochemical capacitive behavior.

Automated summary

This study focused on the preparation of Cu(OH)(2)@Cu flexible thin film electrodes (FTFEs) via different routes and their comparative electrochemical analysis. The results showed that the electrodes prepared via aqueous route exhibited good electrochemical stability and the highest specific capacitance in 1M NaOH solution.