A new advent of exploring rGO/NiO@TiO₂ ternary composites for efficient quasi-solid-state asymmetric supercapacitor

In this study, a ternary nanocomposite of reduced graphene oxide/Nickel oxide@Titanium dioxide (rGO/NiO@TiO₂-RNT) was synthesized via a hydrothermal technique. The X-ray diffraction (XRD) pattern revealed that the composite possessed a well-defined crystalline structure, which was essential for efficient charge transfer and electrochemical performance. High-resolution scanning electron microscope (HR-SEM) analysis found that the composite between NiO@TiO₂ and rGO sheets was coupled through Van der Waals interactions, providing efficient electron/ion paths and sufficient buffer space to alleviate volume expansion. The electrochemical exploration of the prepared ternary nanocomposite exhibited a remarkable specific capacitance of 856 Fg⁻¹ at a current density of 1 Ag⁻¹ and revealed excellent cyclic retention of 91% even after successive 5000 cycles at 5 Ag⁻¹. Finally, the fabricated asymmetric supercapacitor demonstrated a specific capacitance of 325 Fg⁻¹ at a current density of 1 Ag⁻¹, with a maximum energy and power density of 64 Wh Kg⁻¹ and 1.2 KW kg⁻¹, maintained stability at 83% after 5000 cycles. Therefore, the results obtained in this study demonstrated that the prepared ternary nanocomposite is a potential electrode material for next-generation energy storage applications.