• Alsaiari, Norah Salem
• Ahmad, Muhammad
• Ko, Tae Jo
• Hussain, Iftikhar
• Shaheen, Irum
• Arifeen, Waqas Ul
• Ali, Ijaz
• Eldin, Sayed M.
• Alzahrani, Fatimah Mohammed
• Amara, Umay

Abstract

The efficient hybrid materials with high specific capacity and long stability are highly desirable electrode materials for supercapacitors. Herein, composites based on ZnO/NiO as active electrode materials was fabricated using soft-templated hydrothermal method. The NiO and ZnO were successfully synthesize into 3D flower structures. The as-synthesized ZnO and NiO were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical measurements of the fabricated ZnO/NiO electrodes were carried out by series of cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS). The highest specific capacity of 350 C g⁻¹ was found at 2 A g⁻¹ current while the lowest specific capacity of 217 C g⁻¹ was measured at 20 A g⁻¹. Finally, the 3D flower-shaped ZnO/NiO electrode revealed cyclic stability of 72.1 % capacitance retention and 97.1 % Coulombic efficiency at the end of 8000 GCD cycles. The current study revealed augmented supercapacitor properties with exceptional cyclic stability of ZnO/NiO composite-based electrodes. © 2023 Elsevier B.V.

Topics

• nanocomposite
• scanning electron microscopy
• x-ray diffraction
• x-ray photoelectron spectroscopy
• electrochemical-induced impedance spectroscopy
• cyclic voltammetry