Interface-Induced Self-Assembly Strategy Toward 2D Ordered Mesoporous Carbon/MXene Heterostructures for High-Performance Supercapacitors

Two-dimensional transition metal carbonitrides (MXene) have demonstrated great potential in many fields. However, the serious aggregation and poor thermodynamic stability of MXene greatly hinder their applications. Here, an interface-induced self-assembly strategy to synthesize ordered mesoporous carbon/Ti₃ C₂ T_x heterostructures (OMCTs) was developed. In this method, the composite monomicelles formed by Pluronic F127 and low-molecular-weight phenolic resol self-assembled on the surface of Ti₃ C₂ T_x to prevent the restacking of Ti₃ C₂ T_x and maintain its thermostability. The obtained OMCTs possessed high specific surface areas (259-544 m²  g^-1 ), large pore volumes (0.296-0.481 cm³  g^-1 ), and excellent thermodynamic stability (up to 600 °C). Benefiting from these advantages, OMCTs serving as the electrode materials for supercapacitor exhibited superior supercapacitor performances, including high capacitance of 247 F g^-1 at 0.2 A g^-1 , satisfactory rate performance of 190 F g^-1 at 5 A g^-1 , and cyclability.