Here we examine for the first time the electrochemical performance of a carbonitride MXene, Ti3CNTx, as a supercapacitor electrode material. The structure of Ti3CNTx is similar to Ti3C2Tx, with nitrogen and carbon layers sandwiched between three layers of titanium instead of only two layers of carbon. The Ti3CNTx investigated shows high specific capacitances in acidic electrolytes and good rate performance, similar to previous reports on Ti3C2Tx-MXenes, but the charge-discharge response of Ti3CNTx-MXene during cyclic voltammetry is completely different from carbide based MXenes. These results show how manipulation of the composition of MXenes can influence their energy storage properties.
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