Confinement of V₄C₃T_<i>x</i> MXene between NiMn-LDH Nanolayers for Battery–Supercapacitor Hybrid Devices

In recent times, extensive research has focused on developing highly efficient energy storage devices that combine battery-type and capacitive-type electrodes to achieve high energy and power capabilities in a single device. In this study, we engineered flower-like NiMn-LDH/V4C3Tx MXene nanocomposites (NMVs) via a facile hydrothermal procedure. The 3D porous flower-like structure of NMV-25 mitigated the natural inclination of 2D materials to self-aggregate and enriched its electrochemical efficiency for supercapacitor applications by facilitating rapid ion and electrolyte transport between layers. NiMn-LDH endows the nanocomposite with ample active sites, high redox activity, channels for ions, and electron transport. Additionally, V4C3Tx MXene imparts the nanocomposite with robust structural stability, superior electrical conductivity, and rapid reaction kinetics. NMV-25 demonstrated battery-type behavior with a specific capacity of 264.72 mAh g–1 at 1 A g–1. The NMV-25//V4C3Tx hybrid supercapacitor device fabricated with battery-type NMV-25 and V4C3Tx as a capacitive type attained a remarkable energy density of 54.90 Wh kg–1 at a power density of 800 W kg–1 and exhibited exceptional cycling stability. Hence, it can be inferred from the findings that the NMV-25 electrode is a high potential candidate for use as a battery-type electrode material for hybrid supercapacitor applications.