In Situ Growth of Nanorod-Shaped Ni,Co-MOF on Mo₂CT_<i>x</i> MXene Surface to Realize Enhanced Energy Storage for Supercapacitors

Mo₂CT_<i>x</i> MXene materials, known for their high conductivity and abundant surface functional groups, are widely utilized as electrode materials in supercapacitors. However, their tendency to stack during electrochemical energy storage hinders their performance. The in situ growth of nanorod-shaped Ni,Co bimetallic metal-organic frameworks (Ni,Co-MOF) on Mo₂CT_<i>x</i> MXene effectively mitigates this stacking. With their porous structure and high specific surface area, MOFs excel in energy storage, and bimetallic MOFs outperform monometallic ones. The synergy between Mo₂CT_<i>x</i> MXene and Ni,Co-MOF yields an outstanding performance. In a three-electrode system with 1 M KOH, the Mo₂CT_<i>x</i>/Ni,Co-MOF composite shows a specific capacitance of 58 mAh g^-1 (56.26 mAh cm^-3) at 1 A g^-1. When used in a Mo₂CT_<i>x</i>/Ni,Co-MOF//AC asymmetric supercapacitor, it achieves an energy density of 22.7 Wh kg^-1(0.022 Wh cm^-3) at a power density of 293 W kg^-1 (0.284 W cm^-3). Future work will focus on enhancing synthesis methods, exploring different bimetallic combinations, and optimizing electrode designs for gas sensors, batteries, fuel cells, biological sensors, and so on, with outstanding performance and sustainability.