Interfacial Engineering of Co₃O₄@MXene for Superior Charge Storage: A Route to High-Capacitance Supercapacitors

We report an interracially engineered Co₃O₄@Ti₃C₂T_x MXene hybrid as a high-rate charge-storage electrode. Low-temperature assembly under inert conditions preserves the MXene carbide while anchoring nanocrystalline Co₃O₄ on conductive, ion-permeable sheets. XRD and FTIR confirm the structural integrity of MXene without TiO₂ formation. Electrochemically, cyclic voltammetry, Dunn analysis, and galvanostatic tests reveal mixed storage with a dominant pseudocapacitive contribution, while EIS fitting shows reduced charge-transfer resistance for the hybrid compared with either parent. Within a 0.6 V window in 2 M KOH, the composite delivers high specific charge and excellent rate retention, attributable to shortened diffusion paths and fast electron transport at the oxide–MXene interface. These results establish Co₃O₄@MXene as a robust, mechanism-consistent platform for high-power supercapacitors.