Abstract

This study focuses on understanding the electrochemical behavior of Ti3C2Tx MXene synthesized using tetramethylammonium tetrafluoroborate (TMATFB) as an etching agent for the Ti3AlC2 MAX phase. Through in situ Raman spectroscopy and X-ray diffraction (XRD), we investigate the charge storage mechanisms and surface transformations of TMATFB-etched MXene. The results indicate that Ti3C2Tx MXene undergoes reversible H+ ion intercalation, achieving a specific capacitance of 417.4F/g at 1 mV/s in 1 M H2SO4. This reversible process is characterized by a transformation between Ti3C2O2 and Ti3C2(OH)2 on the MXene surface, highlighting the role of oxygen-rich functional groups in enhancing pseudocapacitive behavior. These insights contribute to the understanding of MXene’s electrochemical potential in energy storage systems.

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