Supercapacitors have emerged as a critical energy storage technology due to their exceptional power density, rapid charge–discharge kinetics, and long cycle life. Despite their advantages, enhancing their energy density remains a key challenge for broader applications in electric vehicles, renewable energy integration, and portable electronics. This study presents a novel electrolyte formulation comprising nickel chloride (NiCl 2 ) in ethyl alcohol and cobalt nitrate (Co(NO 3 ) 2 ) in acetone, designed to improve the electrochemical performance of supercapacitors. The proposed electrolytes exhibit remarkable enhancements in specific capacitance, with NiCl 2 ‐based systems achieving 123 F/g with TiO 2 nanoparticles and 138.5 F/g with CuO nanoparticles, while Co(NO 3 ) 2 ‐based systems demonstrate 127 F/g and 131 F/g, respectively. Furthermore, the specific energy (SE) reaches 76.2 Wh/kg and 67.2 Wh/kg for NiCl 2 electrolytes, and 70 Wh/kg and 72.5 Wh/kg for Co(NO 3 ) 2 electrolytes, highlighting their potential for high‐energy storage applications. These findings suggest that the integration of transition metal salts in organic solvents can significantly boost supercapacitor performance by optimizing ion transport and redox activity. The study underscores the importance of advanced electrolyte engineering in overcoming existing limitations in energy storage systems.
Chaudhry et al. (Sun,) studied this question.