<p>In this study, we fabricate an innovative approach to design advanced electrodes for supercapacitors by integrating carbon nanofibers (CNFs) with nickel oxide (NiO) nanoparticles using the electrospinning technique. Comprehensive characterization of the electrode is conducted utilizing X-ray photoelectron spectroscopy, field emission scanning electron microscopy, Brunauer–Emmett–Teller, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy and thermo-gravimetric analysis. We explore the battery-type behavior of the synthesized electrode in a 6&#xa0;M KOH electrolyte solution using electrochemical measurements. The CNF@NiO₅₀ nanofibrous electrodes display an impressive specific capacity of 1028 Cg⁻¹ (specific capacitance 2056 Fg⁻¹) at 2 Ag⁻¹, with durability of 83% maintained after 5000 iterations at 10 Ag⁻¹. The outstanding efficiency is ascribed to the highly open passages in the composite, facilitating efficient diffusion and conduction of electrolytic ions via NiO and CNF. We fabricate a symmetric supercapacitor device by sandwiching two identical electrodes, yielding a remarkable specific capacitance of 226 Fg⁻¹. Notably, the device attains an optimum energy density of 45 Wh kg⁻¹, surpassing previously reported values. This work provides a substantial improvement in high-performance energy storage materials, offering exciting prospects for applications in electric vehicles, renewable energy systems, and wearable electronics.</p>