The increasing demand for efficient energy storage systems has prompted the exploration of novel electrode materials, such as bimetallic metal-organic frameworks (MOFs). This study examines the synthesis of a variety of bimetallic MxNy-MOF materials, including Ni1Co1-MOF, Ni1Co3-MOF, Ni3Co1-MOF, Cu1Co1-MOF, and Ni1Cu1-MOF, as well as their integration with MXene to produce MOF@MXene composite electrode materials for supercapacitors. These MxNy-MOF materials display distinct morphologies and uniform particle sizes. MXene serves as an effective substrate, enhancing the surface coverage with the MOF phase. In interactions with MXene, Co2+ and Cu2+ demonstrate stronger binding than Ni2+, which prefers binding with ligands. Electrochemical testing reveals that Ni and Co-based composites, particularly Ni1Co1-MOF@MXene, exhibit superior performance and achieving a high specific capacitance of 1493.6 F g−1 at 1 A g−1. These materials also show impressive rate performance and cycle stability, with a retention of 57.2 % after 5,000 cycles. An all-solid-state flexible supercapacitor using Ni1Co1-MOF@MXene demonstrates an energy density of 73.9 Wh·kg−1 at a power density of 750 W·kg−1, maintaining 81.8 % capacity and 97 % Coulombic efficiency after 10,000 cycles. The energy storage mechanism primarily involves Faradaic redox reactions of Co2+/Co3+ and Ni2+/Ni3+, coupled with OH- adsorption/desorption processes. This study not only elucidates the kinetic dynamics and storage mechanisms of these composite materials but also highlights their potential applications in advanced energy storage technologies.