High-performance aqueous electrochemical energy storage technology has attracted extensive research interest due to its high safety and potential for commercialization. Herein, following the simultaneous doping-electrostatic synergistic assembly strategy, we synthesized the 2D/2D Co-doped NiMn-Layered double hydroxide (LDH)/V₂CT_x MXene (CNMV) composite materials that serve as advanced electrodes for aqueous energy storage devices, such as supercapacitors and zinc ion batteries (ZIBs). For supercapacitors, benefiting from the hetero ion doping effect, the as-assembled CNMV electrode exhibits a higher specific capacitance of 1005 F g⁻¹ at a current density of 1 A g⁻¹. For the assembled asymmetric supercapacitor (ASC) devices, a high energy density of 30.16 Wh kg⁻¹ at 0.7 kW kg⁻¹ was achieved. Acting as the cathode for ZIBs, CNMV exhibits a high reversible capacity of 322.7 mA h g⁻¹ at 0.2 A g⁻¹ after 100 cycles, and a considerable energy density of 368.7 W h kg⁻¹ at a power density of 246 W kg⁻¹. The battery-type transformation to the pseudocapacitance-type CNMV electrode for the supercapacitor was demonstrated by quantitative kinetic analysis, while phase transformation and Zn²⁺ insertion/extraction for zinc ion storage mechanism were demonstrated by ex-situ XRD and XPS. This study provides a facile and effective approach for the design of high-performance MXene-based electrodes for aqueous electrochemical energy storage devices.

高性能水性电化学储能技术因其高安全性和商业化潜力而引起了广泛的研究兴趣。在此，我们遵循同步掺杂-静电协同组装策略，合成了 2D/2D 共掺杂 NiMn 层状双氢氧化物 (LDH)/V ₂ CT _x MXene (CNMV) 复合材料，用作水性储能设备的先进电极，例如超级电容器和锌离子电池 (ZIB)。超级电容器，从异质离子掺杂效应中受益，所述的组装CNMV电极表现出的1005 F G更高的比电容^-1在1A g的电流密度^-1. 对于组装的非对称超级电容器 (ASC) 设备，在 0.7 kW kg ^-1下实现了 30.16 Wh kg ^-1的高能量密度。作为ZIBs的阴极，CNMV在100次循环后在0.2 A g ^{-1 下}表现出322.7 mAh g ^-1的高可逆容量，在246 W kg ^-的功率密度下表现出368.7 W h kg ^-1的相当大的能量密度。¹ . 通过定量动力学分析证明了超级电容器向赝电容型 CNMV 电极的电池型转变，而相变和 Zn ²⁺ 通过非原位 XRD 和 XPS 证明了锌离子存储机制的插入/提取。该研究为设计用于水性电化学储能装置的高性能 MXene 电极提供了一种简便有效的方法。