Reliable energy storage systems are important to meet the growing energy demand. Currently, supercapacitors and batteries serve as basic energy storage devices. These storage devices need advanced electrode materials that exhibit high capacitance, stability, and rapid charge-discharge capabilities. Covalent triazine frameworks (CT-Frameworks) due to the enormous surface area, thermal stability, and adjustable permeability, and Nb4C3Tx MXene due to its high electrical conductivity are used as an electrode material in this study. The electrochemical properties of CT-Frameworks@Nb4C3Tx (CTNM) are examined across different temperatures. The CTNM demonstrates the specific capacity of 1639C/g (2731 F/g) at 1 A/g. A supercapattery with CTNM and activated carbon (AC) delivers an energy density of 56.43 Wh/kg, a power density of 1200 W/kg, and a specific charge capacity of 272C/g at 2.0 A/g. CTNM composite also showed promise in electrocatalytic applications with an overpotential of 132 mV and a Tafel slope of 44 mV/dec.