Abstract
<h2>Summary</h2> Although MXene has been widely used in many energy storage systems, the absence of a high intrinsic voltage plateau results in its poor discharging feature. Herein, we report a Nb<sub>2</sub>CTx MXene cathode with an apparent discharge voltage plateau for high-performance aqueous zinc ion batteries. Triggered by a repeated high-voltage scanning up to 2.4 V, the Nb<sub>2</sub>CTx cathode gradually displays a stable Zn<sup>2+</sup> storage dominated by a battery behavior. A high discharge voltage plateau of 1.55 V is presented, which is distinct from all reported MXene electrodes. Consequently, a record-level energy density among all aqueous MXenes electrodes of 146.7 Wh kg<sup>−1</sup> with a 63% contribution from the plateau region is obtained, which is 292% that of the capacitive Nb<sub>2</sub>CTx electrode. The developed high-voltage scanning strategy is also effective for Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene to achieve a remarkable voltage plateau.
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