MXenes have extensive applications due to their different properties determined by intrinsic structures and various functional groups. Exploring different functional groups of MXenes leads to improved performance or potential applications. In this work, we prepared new TiCPBr (x=0.4-0.6) MXene with phosphorus functional groups (-P) through a two-step gas-phase reaction. The acquisition of -P is achieved by replacing bromine functional groups (-Br) of TiCBr in the phosphorus vapor. After -Br is replaced with -P, TiCPBr MXene shows an improved areal capacitance (360 mF cm) at 20 mV s compared with TiCBr MXene (102 mF cm). At a current density of 5 mA cm after 10000 cycles, the capacitance retention of TiCPBr MXene has not decreased. The pseudocapacitive enhancement mechanism has been discovered based on the dual redox sites of the functional groups -P and Ti.
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| http://dx.doi.org/10.1002/anie.202403508 | DOI Listing |
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