MXene/graphene oxide (GO) composites have broad application prospects in fields,such as energy,environment,and biomedicine. In this study,few-layer Ti₃C₂T_x was mixed with GO,which was then reduced and surface-modified using γ-ray radiation. Simultaneously,a composite hydrogel (M/rGO) was prepared by self-assembly from the interaction between the surface groups of reduced graphene oxide (rGO) and the oxygen-containing functional groups on the surface of Ti₃C₂T_x. The M/rGO-75 composite hydrogel prepared at an absorbed dose of 75 kGy exhibited a uniform three-dimensional network structure. The hydrogel was further freeze-dried and annealed to remove surface oxygen-containing functional groups and prepare a new composite aerogel (H-M/rGO),which maintained the original network structure. The prepared H-M/rGO electrode was used as a supercapacitor electrode. The optimized and synthesized H-M/rGO-75 composite aerogel exhibited a mass-specific capacitance of 119 F/g at a current density of 1 A/g,which was significantly higher than those of GO and aerogels without MXene. In addition,it exhibited excellent rate performance,conductivity,and cycling stability.