High-performance flexible and free-standing N-doped Ti₃C₂T_x/ MoO_x films as electrodes for supercapacitors

In order to obtain high-performance flexible electrodes for supercapacitors, the nitrogen-doped delaminated-Ti₃C₂T_x (N-d-Ti₃C₂T_x) decorated with MoO_x nanoparticles (N-d-Ti₃C₂T_x/MoO_x) films are prepared by a one-step solvothermal method. The N-d-Ti₃C₂T_x nanosheets with high conductivity can facilitate electron transfer during the charge and discharge process, and the MoO_x nanoparticles can contribute to high pseudocapacitance. Hence, their combination is expected to not only inhibit N-d-Ti₃C₂T_x nanosheets from re-stacking, but also enhance the specific capacity of the whole electrode. Here, benefiting from the synergistic effect of the two components, the obtained optimal flexible and free-standing N-d-Ti₃C₂T_x/MoO_x film electrode delivers an ultrahigh capacity of 341.0 C g⁻¹ (920.6 C cm⁻³, 487.1 F g⁻¹, 1315.2 F cm⁻³) at the scan rate of 2 mV s⁻¹, and shows superior capacity retention of 99.2% after 11000 cycles at the current density of 5 A g⁻¹. Moreover, the flexible and free-standing N-d-Ti₃C₂T_x/MoO_x film electrode is also beneficial to promote the development of flexible supercapacitors.