Synthesis and Fabrication of Metal Cation Intercalation in Multilayered Ti₃C₂T Composite CNF Electrode for Asymmetric...

Ti₃C₂T has attracted considerable attention from researchers in energy storage due to its unique structure and beneficial surface functional group characteristics. Recent studies have focused extensively on developing Ti₃C₂T composites to create potential electrode materials for energy storage applications. Carbon nanofiber is often combined with Ti₃C₂T to produce high-performance functional nanocomposites, effectively harnessing the unique properties of Ti₃C₂T nanosheets while ensuring exceptional electrochemical behavior. This work employs an ultrasonication method to prepare a Na-Ti₃C₂T/CNF electrode. Establishing a stable interlayer structure between Ti₃C₂T nanosheets and cationic metal intercalation materials is crucial for expanding the interlayer spacing of Ti₃C₂T and creating multidirectional stable ion transport channels. Consequently, this process exposes more active sites that are accessible to ions. At a current density of 1 A g^-1, the resulting Na-Ti₃C₂T/CNF demonstrates an impressive specific capacitance of 680.2 F g^-1. Notably, the asymmetric supercapacitor assembled with Na-Ti₃C₂T/CNF as the positive electrode and activated carbon as the negative electrode exhibits remarkable cyclic retention of 83.1% and the Coulombic efficiency of 90.5% after 10,000 cycles at 10 A g^-1, a wide voltage window of 1.5 V, a high energy density of 102.5 W h kg^-1, and a power density of 2963.7 W kg^-1. The fabricated coin cell ASC devices, which include glowing red light-emitting diodes, were demonstrated in practical applications. The optimization strategy for developing Na-Ti₃C₂T/CNF provides essential technical support for integrating Na-Ti₃C₂T/CNF into the next generation of portable and adaptable wearable electrochemical energy storage devices.