材料科学
动力学
水溶液
阳极
氧化还原
电解质
MXenes公司
金属
电子转移
化学工程
离子
纳米技术
电极
化学
物理化学
有机化学
工程类
冶金
物理
量子力学
作者
Xinliang Li,Na Li,Zhaodong Huang,Ze Chen,Guojin Liang,Qi Yang,Mian Li,Yuwei Zhao,Longtao Ma,Binbin Dong,Qing Huang,Jun Fan,Chunyi Zhi
标识
DOI:10.1002/adma.202006897
摘要
Abstract 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 Nb 2 CT 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 I 2 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 ZnSO 4 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 I 2 –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 Nb 2 CT X MXene host are responsible for enhanced kinetics and suppressed shuttle behavior. This work can be extended to the fabrication of other I 2 –metal batteries with long‐life‐time expectations.
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