Confinement of V4C3Tx MXene between NiMn-LDH Nanolayers for Battery–Supercapacitor Hybrid Devices

Abstract

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/V₄C₃T_x 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, V₄C₃T_x 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//V₄C₃T_x hybrid supercapacitor device fabricated with battery-type NMV-25 and V₄C₃T_x 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.