<p>Core–shell NiMoO₄@g-C₃N₄/RGO nanocomposite arrays have been successfully synthesized on Ni foam using the easy hydrothermal method and evaluated for supercapacitor applications, demonstrating significantly improved performance. The NiMoO₄@g-C₃N₄/RGO (NMGR) core–shell was characterized utilizing FESEM, XRD, Raman, XPS, and BET techniques. demonstrates outstanding performance with a specific capacitance of 1747 F g⁻¹ at a current density of 1 Ag⁻¹, and the capability can reach 1555 Fg⁻¹ even at 20 Ag⁻¹. Additionally, there is no evident capacitance loss observed over 10,000 cycles, demonstrating exceptional reliability during cycling. This results from the numerous benefits provided by the core–shell structure, including a large surface area, rapid electrolyte penetration, effective charge transport, highly accessible active sites, and the synergistic interactions among these factors. The NiMoO₄@g-C₃N₄/RGO//AC ASC demonstrates a high voltage region reaching up to 1.6&#xa0;V. The maximum specific capacitance is recorded at 234.4 Fg⁻¹, accompanied by an impressive energy density of 42.4 Wh kg⁻¹ and a power density of 812 Wkg⁻¹ at a current density of 1.0 A g⁻¹. The ternary hybrid electrode demonstrates impressive cycle life, achieving 97.4% specific capacitance retention after 10,000 cycles. The outstanding performances are attributed to the precisely defined nanostructure, stimulating porous microscopic structure, and uniform contact. This study may be significant for the design of unique structures and component electrodes aimed at accomplishing high-performance energy storage devices.</p>