Fabrication of a fibrous MnO2@MXene/CNT electrode for high-performance flexible supercapacitor

As shining stars of 2-dimensional materials, transition metal carbides (MXene) and transition metal oxides have attracted much interest in various energy fields due to their excellent conductive and electrochemical properties . However, big challenge still remains in the accessibility of high-performance fibrous electrodes for flexible supercapacitors . In this paper, MnO 2 nanorods are loaded on MXene sheets to obtain MnO 2 @MXene composites by a facile hydrothermal method , which are subsequently coated on carbon nanotube fibers (CNTFs). With a fine control on morphology, the resulting MnO 2 @MXene/CNTF electrode exhibits a high specific capacitance of 181.8 F/g at 1 A/g, a capacitance retention of 91% after 5000 charge-discharge cycles, as well as superb flexibility, i.e., neglected capacitance loss at a bending angle of 180°. The as-fabricated flexible composite fiber opens a new door for transition metal carbides and transition metal oxides with great potential in flexible electronics.