MnO_x/Ti₃C₂T_x MXene/Carbon Nanofibers composite fiber film electrode with good flexibility derived by combining electrospinning technique with carbonization treatment

The restack of MXene nanosheets greatly affects its electrochemical performance and application, while electrospinning technique can spin two-dimensional MXene nanosheets into one-dimensional nanofibers, which can prevent the self-stacking of MXene nanosheets. Herein, MnO_x/Ti₃C₂T_x MXene/CNFs (carbon nanofibers) composite fiber films with good flexibility were prepared by combining an electrospinning technique and a carbonization treatment, in which the pseudo capacitive material MnO₂ mixed with carbon nanotube (CNT) was introduced into Ti₃C₂T_x MXene. The synergistic effect of MnO_x, Ti₃C₂T_x MXene and CNFs improves the capacitance and flexibility of the composite fiber film, and the specific capacitance of the MnO_x/Ti₃C₂T_x MXene/CNFs fiber film electrode delivers 211.57 F·g⁻¹ at a scanning rate of 2 mV·s⁻¹. After 3000 cycles at a current density of 5 A·g⁻¹, it can still maintain 95% of the initial capacitance. The results indicate that the MnO_x/Ti₃C₂T_x MXene/CNFs composite fiber films have great potential for flexible supercapacitors.