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[Display omitted] • Ti 3 C 2 T x MXene/carbon nanofiber electrodes are prepared by electrospinning. • The effects of Ti 3 C 2 T x MXene sheets size on the performances were investigated. • The electrodes (SMX/C) exhibit high-rate performance (90 F/g at 300 mV/s). • The electrodes have outstanding flexibility (98% retention after 500 bending). Increasing the capacitance and rate performance of the carbon-based electrodes used in flexible supercapacitors remains a key challenge for commercial viability. To meet these requirements, free-standing Ti 3 C 2 T x MXene/carbon nanofiber (CNF) electrodes were prepared by electrospinning of polyacrylonitrile (PAN) and carbonization for application as flexible supercapacitor electrodes. The effects of Ti 3 C 2 T x MXene size on fiber formation and electrochemical performance were investigated. Ti 3 C 2 T x MXene/CNF electrodes exhibited a specific capacitance of 90 F/g at a fast scan rate of 300 mV/s, which is almost 2.3 times higher than that of a pure PAN-derived CNF (38 F/g at 300 mV/s), while showing similar capacitance values of around 120 F/g at the slow scan rate of 2 mV/s. Due to the high degree of mechanical flexibility of CNFs, MXene/CNF based flexible supercapacitors also demonstrate long-term cycling stability (98% retention after 10 K charge-discharge cycles), and outstanding flexibility in dynamic bend tests. These results suggest that the MXene/CNFs have great potential for applications in flexible and versatile electronic devices. [ABSTRACT FROM AUTHOR]