High-performance supercapacitor materials based on NiMn-LDH layered structures with MXene layers

In recent years, the environmental degradation exacerbated by extensive fossil fuel use has underscored the urgent need for cleaner and more efficient energy storage systems. This study addresses the challenges faced by hybrid supercapacitors (HSCs), which, despite their high power density and long lifespan, still suffer from low energy density and high self-discharge rates. We employ a co-precipitation method to integrate MXene with NiMn-layered double hydroxides (LDHs), optimizing the performance of HSCs. The incorporation of MXene enhances the conductivity and structural stability of NiMn-LDH, addressing issues of poor conductivity and instability during cycling. The developed NiMn-LDH@MXene electrodes demonstrate remarkable electrochemical performance, including a specific capacitance of 1530 F g⁻¹ at 2 A g⁻¹, a capacity retention rate of 90.52 % after 20,000 cycles at 10 A g⁻¹, a high energy density of 60.56 Wh kg⁻¹, and an excellent power density of 924.95 W kg⁻¹. This research not only marks a significant advancement in electrode material performance but also provides valuable insights into the development of next-generation energy storage devices with enhanced stability and efficiency. •This study improves HSC performance by optimizing anode materials with advanced MXene and NiMn-LDH electrode materials.•The integration of MXene and NiMn-LDH enhances the electrochemical stability, conductivity, and performance of the electrodes.•The NiMn-LDH@MXene electrode achieves 1530 F g−1 at 2 A g−1 and retains 90.52% capacity after 20,000 cycles at 10 A g−1.•The electrode demonstrates a high energy density of 60.56 Wh kg−1 and an excellent power density of 924.95 W kg−1.