Layered double hydroxides (LDHs) are promising energy materials for their considerable theoretical capacities and adjustable compositions, however, also subjected to the intrinsic poor conductivity and agglomeration property, hence, the precise hybridization with high conductivity and active surface matrix is an effective strategy to solve these intractable problems. Herein, we exploit hierarchical nanohybrids via ionic hetero-assembly of 3D FeNi-LDH arrays on 2D Ti₃C₂T_x-based MXene nanosheets through mutual coupling synergy. The strong interfacial interaction and good electronic coupling between the FeNi-LDH arrays and Ti₃C₂T_x MXene nanosheets not only improve the structural stability, electrical conductivity, and electrolyte-accessibility but also greatly boost the redox reaction kinetics. The obtained Fe₁Ni₃-LDH/Ti₃C₂T_x-MXene energy materials reveal prominent conductivity, superior capacitance behavior, and the constructed symmetric supercapacitor demonstrates outstanding energy densities of 94.1 Wh Kg^-1 and power density of 7431.8 W Kg^-1. This study offers a facile and efficient strategy for developing 2D MXene-based energy storage devices with a stable interface and favorable electrochemical performance.

层状双氢氧化物 (LDHs) 具有可观的理论容量和可调节的成分，是很有前途的能源材料，但也受到固有的导电性和团聚性差的影响，因此，具有高导电性和活性表面基质的精确杂化是解决问题的有效策略这些棘手的问题。在此，我们通过相互耦合协同作用，通过3D FeNi-LDH 阵列在基于 2D Ti ₃ C ₂ T _x的 MXene 纳米片上的离子异质组装来开发分级纳米杂化物。FeNi-LDH阵列与Ti ₃ C ₂ T _x之间的强界面相互作用和良好的电子耦合MXene 纳米片不仅提高了结构稳定性、导电性和电解质的可及性，而且大大提高了氧化还原反应动力学。获得的 Fe ₁ Ni ₃ -LDH/Ti ₃ C ₂ T _x -MXene 能源材料显示出显着的导电性和优异的电容行为，构建的对称超级电容器表现出出色的能量密度 94.1 Wh Kg ^-1和 7431.8 W Kg ^{-1 的}功率密度^{- 1} . 该研究为开发具有稳定界面和良好电化学性能的基于 2D MXene 的储能设备提供了一种简便有效的策略。