The present study introduces a Co3O4 and Ti3C2Tx nanocomposite, synthesized via an ultrafast microwave- assisted method for electrochemical energy storage applications. Morphological and structural analyses indicated the formation of a nanoflower-like Co3O4-MXene nanocomposite, which is advantageous for the swift and efficient diffusion of electrolytes, thereby enhancing electrochemical performance. The growth of Co3O4 in a layered structure enhances ion diffusion. The Co3O4-MXene nanocomposite demonstrated a maximum specific capacitance of 868 F g- 1 at a current density of 1 A g- 1, along with excellent rate capability and cyclic stability. Furthermore, the assembled all solid-state asymmetric supercapacitor (ASC) exhibited an energy density of 10.41 Wh kg- 1 at a power density of 2500 W kg- 1, along with remarkable cycling stability, preserving 97.6 % of its initial capacitance after 5000 cycles. The obtained results demonstrate the significant improvement in electrochemical performance of Co3O4 due to addition of Ti3C2Tx.