<p>The growing need for renewable energy storage technologies has prompted researchers to create electrode materials with exceptional performance. Supercapacitors have drawn considerable interest as energy storage technology because of their distinctive characteristics. Developing portable smart devices that could ensure worldwide energy security was their main objective. The Ba-doped ZnCr₂O₄ spinel (Ba-ZnCr₂O₄) was produced by the hydrothermal technique. The purpose of the study was to examine the potential of doped electrode material for supercapacitor (SC_s). When evaluated at 1 A/g, the Ba-doped ZnCr₂O₄ demonstrates the best charge–discharge behavior, with an excellent specific capacitance (<i>C</i>_s) value of roughly 983.18 F/g. Furthermore, the Ba-doped ZnCr₂O₄ achieved a power density of 1200 W/kg. The promising outcomes for improving energy-efficient and affordable supercapacitor electrodes (SC_s) for innovative energy storage systems and portable electronics are highlighted by these encouraging characteristics, which include high capacitance and exceptional stability.</p>