a Department of Chemistry, Faculty of Science, University of Sialkot, Sialkot,

51310, Pakistan

b Department of Chemistry, Faculty of Science, University of Gujrat, Hafiz Hayat Campus, Gujrat, 50700, Pakistan

c Department of Mechanical Engineering, College of Engineering, Taif University, Kingdom of Saudi Arabia

Researchers are concerning critical energy crisis and environmental deterioration due to excessive use of non-renewable energy resources. An in-depth study has visualized that the synthesis of Cerium-based ZnO nanocomposite plays pivot role in the success of energy storage devices. In this regard, a one-pot hydrothermal approach was employed for the successful synthesis of pure ZnO and CeO2-ZnO nanomaterials. The prepared materials were assessed with electrochemical performance and recommending that this composite material is showing remarkable capacitive and energy density performance. The scanning electron microscope exhibited interparticle interaction of zinc and cerium material enhanced Supercapacitor performance of material. The higher intensity peak at 525 cm- 1 corresponds to the Ce-O stretching mode that ensures the synthesis of the cerium oxide nanoparticles.

The cyclic voltammetry showed excellent specific capacitance of 1031 F/g for CeO2-ZnO composite material. Similarly, the composite material also illustrated excellent energy density value of 36.24 Wh/kg. Lastly, the electrochemical impedance spectroscopy exhibited lower electrolyte-electrode resistance at the interface that suggest better electrochemical performance of composite material and recommending material in energy storage system.