Weak binding and affinity between the conductive support and iodine species leads to inadequate electron transfer and the shuttle effect. Herein, redox kinetics and duration are significantly boosted by introducing a Nb₂CT_X host that is classified as a layered 2D Nb‐based MXene. With a facile electrodeposition strategy, initial I⁻ ions are electrically driven to insert in the nanosized interlayers and are electro‐oxidized in situ. Linear I₂ is firmly confined inside and benefits from the rapid charge supply from the MXene. Consequently, an aqueous Zn battery based on a Zn metal anode and ZnSO₄ electrolyte delivers an ultraflat plateau at 1.3 V, which contributes to 84.5% of the capacity and 89.1% of the energy density. Record rate capability (143 mAh g⁻¹ at 18 A g⁻¹) and lifespan (23 000) cycles are achieved, which are far superior to those of all reported aqueous MXenes and I₂–metal batteries. Moreover, the low voltage decay rate of 5.6 mV h⁻¹ indicates its superior anti‐self‐discharge properties. Physicochemical analyses and density functional theory calculations elucidate that the localized electron transfer and trapping effect of the Nb₂CT_X MXene host are responsible for enhanced kinetics and suppressed shuttle behavior. This work can be extended to the fabrication of other I₂–metal batteries with long‐life‐time expectations.

中文翻译：

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通过MXene限制提高氧化还原动力学和I2 / I-水溶液转化化学反应的持续时间

导电载体和碘物质之间的弱结合和亲和力导致电子转移和穿梭效应不足。在此，引入Nb ₂ CT _X主机被归类为基于2D Nb的分层MXene，可以显着提高氧化还原动力学和持续时间。用轻便电策略，初始I ^-离子被电驱动的纳米夹层插入和在原位电氧化。线性I ₂牢固地限制在内部，并受益于MXene的快速电荷供应。因此，基于Zn金属阳极和ZnSO ₄的水性Zn电池电解质在1.3 V电压下具有超平坦的平稳期，占容量的84.5％和能量密度的89.1％。记录速率能力（143毫安克^-1在18 A G ^-1）和寿命（23 000）循环来实现，这远远优于那些所有的报告水性MXenes和我₂ -金属电池。此外，5.6 mV h ^-1的低电压衰减率表明其优异的抗自放电性能。理化分析和密度泛函理论计算表明，Nb ₂ CT _X的局域电子转移和俘获效应MXene主体负责增强动力学并抑制穿梭行为。这项工作可以扩展到其他具有长寿命预期的I _2金属电池的制造。