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The class of two-dimensional metal carbides and nitrides known as MXenesoffer a distinct manner of property tailoring for a wide range of applications.The ability to tune the surface chemistry for expanding the property space ofMXenes is thus an important topic, although experimental exploration of newsurface terminals remains a challenge. Here, we synthesized Ti3C2 MXene withunitary, binary and ternary halogen terminals, e.g. -Cl, -Br, -I, -BrI and-ClBrI, to investigate the effect of surface chemistry on the properties ofMXenes. The electrochemical activity of Br and I element result in theextraordinary electrochemical performance of the MXenes as cathodes for aqueouszinc ion batteries. The -Br and -I containing MXenes, e.g. Ti3C2Br2 andTi3C2I2, exhibit distinct discharge platforms with considerable capacities of97.6 mAh g-1 and 135 mAh g-1. Ti3C2(BrI) and Ti3C2(ClBrI) exhibit dualdischarge platforms with capacities of 117.2 mAh g-1 and 106.7 mAh g-1. Incontrast, the previously discovered MXenes Ti3C2Cl2 and Ti3C2(OF) exhibit nodischarge platforms, and only ~50% of capacities and energy densities ofTi3C2Br2. These results emphasize the effectiveness of the Lewis-acidic-meltetching route for tuning the surface chemistry of MXenes, and also show promisefor expanding the MXene family towards various applications.

Halogenated MXenes with Electrochemically Active Terminals for High Performance Zinc Ion Batteries