用于高性能锌离子电池的具有电化学活性端的卤化MXene
Halogenated MXenes with Electrochemically Active Terminals for High Performance Zinc Ion Batteries
摘要：
被称为MXenes的二维金属碳化物和氮化物类为广泛的应用提供了独特的性能定制方式。因此，调整表面化学以扩展MXene的属性空间的能力是一个重要的课题，尽管新表面终端的实验探索仍然是一个挑战。在这里，我们合成了具有一元、二元和三元卤素末端（例如-Cl、-Br、-I、-BrI和-ClBrI）的Ti 3C 2 MXene，以研究表面化学对MXene性质的影响。溴元素和碘元素的电化学活性决定了MXene作为水溶液锌离子电池阴极的优异电化学性能。含有-Br和-I的MXene，例如Ti 3C 2Br 2和Ti 3C 2 I2，表现出不同的放电平台，具有97.6mAh g-1和135 mAh g-1的相当大的容量。Ti 3C 2（BrI）和Ti 3C 2（ClBrI）表现出双放电平台，容量为117.2 mAh g-1和106.7 mAh g-1。相比之下，先前发现的MXenes Ti 3C 2Cl 2和Ti 3C 2（OF）没有表现出放电平台，并且仅为Ti 3C 2Br 2的~50%的容量和能量密度。这些结果强调了路易斯酸熔融蚀刻路线用于调整MXene表面化学的有效性，并且还显示了将MXene家族扩展到各种应用的前景。
英文摘要：
The class of two-dimensional metal carbides and nitrides known as MXenes offer a distinct manner of property tailoring for a wide range of applications. The ability to tune the surface chemistry for expanding the property space of MXenes is thus an important topic, although experimental exploration of new surface terminals remains a challenge. Here, we synthesized Ti3C2 MXene with unitary, binary and ternary halogen terminals, e.g. -Cl, -Br, -I, -BrI and -ClBrI, to investigate the effect of surface chemistry on the properties of MXenes. The electrochemical activity of Br and I element result in the extraordinary electrochemical performance of the MXenes as cathodes for aqueous zinc ion batteries. The -Br and -I containing MXenes, e.g. Ti3C2Br2 and Ti3C2I2, exhibit distinct discharge platforms with considerable capacities of 97.6 mAh g-1 and 135 mAh g-1. Ti3C2(BrI) and Ti3C2(ClBrI) exhibit dual discharge platforms with capacities of 117.2 mAh g-1 and 106.7 mAh g-1. In contrast, the previously discovered MXenes Ti3C2Cl2 and Ti3C2(OF) exhibit no discharge platforms, and only ~50% of capacities and energy densities of Ti3C2Br2. These results emphasize the effectiveness of the Lewis-acidic-melt etching route for tuning the surface chemistry of MXenes, and also show promise for expanding the MXene family towards various applications.
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