Zinc oxide nano-flowers synthesized via a hydrothermal approach for electrochemical performance as a supercapacitor electrode

Abstract

The nano-flower-shaped zinc oxide (ZnO-NFs) was prepared using the hydrothermal technique. XRD and FESEM were used to analyze the crystalline structure and morphology of the synthesized sample, respectively. An asymmetric supercapacitor coin cell (ASCs) has been fabricated to analyze the electrochemical performance. CV, GCD, and Nyquist plots have been taken using a two-electrode electrochemical workstation. For ZnO-NFs based ASCs, the specific capacitance has been calculated at scan rates of 10–30 mVs⁻¹. The calculated specific capacitance is 101.78 Fg^-1 at 10 mVs⁻¹. The ASCs exhibit energy and power densities of 5.54 WhKg⁻¹ and 2.65 WKg^-1 at 3 Ag^-1, respectively.