Nanostructured chromium-doped nickel cobaltite (Cr–NiCo₂O₄) was successfully synthesized via a hydrothermal route. The obtained samples were characterized using XRD and FESEM analyses and subsequently employed for electrode fabrication for supercapacitor applications. The engineered morphology provides abundant electrochemically active sites, contributing to enhanced charge-storage behavior. The electrode delivered a high specific capacitance of 832 F g⁻¹ at 1 A g⁻¹ in 1 M NaOH, along with an energy density of 21 Wh kg⁻¹ and a power density of 215 W kg⁻¹. Furthermore, the device demonstrated good cycling stability, retaining 95% of its capacitance after 1000 cycles at
15 A g⁻¹.