Effect of annealing on hydrothermally deposited Co3O4-ZnO thin films for supercapacitor applications. (2021)

• Record Type: Journal Article
• Authors: Obodo, Raphael M.; Chime, Ugochi; Nkele, Agnes C.; Nwanya, Assumpta C.; Bashir, A.K.H; Madiba, I.G.; Asjad, M.; Ahmad, I.; Zhao, T.; Thovhogi, N.; Ezema, Fabian I.
• Is Part Of: Materials today. Volume 36:Part 2(2021)
• Page Start: 374
• Page End: 378
• Publication Date: 2021
• Subjects: Cobalt oxide -- Hydrothermal -- Supercapacitor -- Cyclic voltammetry -- Power density; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.04.229
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Co3 O4 -ZnO thin films were synthesis using hydrothermal technique in an alkaline bath. The alkalinity of the reaction bath was maintained at pH values of 10 and 12 using an aqueous ammonia solution. Fabricated films were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–visible spectroscopy for morphological, structural and optical properties of the fabricated thin films respectively. Electrochemical behaviour of the films were studied using potentiostat to carry out its cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge discharge (GCD) to ascertain its usefulness as supercapacitors electrodes materials. The maximum specific capacitance of 730 F/g and electrode resistance of 0.0076 Ω electrode was obtained. Calculated values of the band gap energy, specific capacitance and its resistance indicate its possible applications in photovoltaic energy storage systems and supercapacitors.