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Improving the electrochemical performance of metal oxide-based materials for energy storage devices often involves employing key strategies, including the deliberate modification of composition through composite formation and the application of structural engineering techniques. Herein, we have synthesized bismuth antimonate (BiSbO 4) and ternary structure is constructed by integrating Graphitic Nanofiber (GNF) and MXene (MX) via a facile hydrothermal method. The synergistic effect of the well-defined structure, coupled with the excellent electrical conductivity facilitated by the MXene and GNF networks, significantly contributes to the outstanding energy and power density. The unblocked ion and electron channels within its hierarchical structure enhances the material's performance as a battery-type cathode for supercapacitors. This work reports a notable specific capacitance of 819 F g−1 at 1 A g−1 and an impressive durability, with 94% capacity retention after 5000 charge/discharge cycles in a three-electrode system. Furthermore, an asymmetric supercapacitor device BSO–GF–MX‖AC is fabricated with activated carbon as negative electrode, which delivered superior energy density 46 Wh kg−1 at power density 750 W kg−1 and retains 90.6% of initial capacitance. This study provides a promising strategy for fabricating ternary composite-based electrodes, offering a pathway to assemble high-performance and cost-effective energy storage devices. [Display omitted] • The composite BSO–GF–MX is formed through integration of BiSbO 4 , graphitic nanofiber and MXene. • BSO–GF–MX with micro and mesopores enhances nanocomposite's battery-type performance. • The electrode demonstrates a capacitance of 819 F g−1 at 1 A g−1 in a three-electrode system. • The fabricated device shows energy density of 46.1 Wh kg−1 at power density 750 W kg−1. [ABSTRACT FROM AUTHOR]