Single-step hydrothermal strategy of hybrid ternary CuO/TiO₂/rGO nanocomposites-unveiling the power of quasi-solid-state electrolyte with an enriched energy density for an asymmetric supercapacitor fabrication

In this present study, CuO/TiO₂/rGO (CTG) hybrid ternary composite was synthesized via a single-step hydrothermal route for an asymmetric supercapacitor application. The PXRD pattern and XPS analysis confirms the formation of prepared ternary composites. As analyzed by FE-SEM and HR-TEM techniques, both CuO and TiO₂ nanoparticles were anchored on the conducting two-dimensional rGO matrix, which facilitates efficient electron transport during electrochemical tests. From the electrochemical investigations, the CTG-2 composite revealed a high rise in capacitance value of 1077 Fg^-1, overcoming the individual capacitance of CuO (173.4 Fg^-1), TiO₂ (206.2 Fg^-1), rGO (269 Fg^-1), and composite CTG-1 (690 Fg^-1) at a current density of 1 Ag^-1 with an unveiled remarkable capacitance performance of 88.4 % over the 5000 cycles at 5 Ag^-1. Further, an asymmetric supercapacitor device was also assembled in two-electrode system with a specific capacitance of 563.7 Fg^-1 at 1 Ag^-1, with an energy and power density of 50.2 Wh Kg^-1 and 498.2 W Kg^-1. This research provides a novel approach for synthesizing CTG ternary nanocomposite, which could have an impact on contemporary electrical vehicles and portable electronics that are used for energy storage applications.