Nanosheets assembled layered MXene/MoSe2 nanohybrid positive electrode materials for high-performance asymmetric supercapacitors

Herein, we report a composite structure by incorporating MoSe 2 nanosheets in organ-like Ti 3 C 2 T x MXene (MXene/MoSe 2 ) as new nanohybrid anode materials for high-performance asymmetric supercapacitors. Benefits of the positive advantages including unique heterostructure, enhanced active area for redox reactions, and beneficial synergetic interaction, the specific capacitance of the MXene/MoSe 2 composite electrode was high up to 1358.5 F g −1 at 1 A g −1 , much higher than that of the pure Ti 3 C 2 T x MXene and MoSe 2 electrodes. In addition, when applied the synthesized Ti 3 C 2 T x MXene/MoSe 2 nanohybrid as positive electrode in asymmetric supercapacitor (ASC), excellent performance is observed. For instance, a high specific energy of 55.6 Wh kg −1 , high specific power of 800.3 W kg −1 with the capacitance retention of 94.1% even after 10,000 cycles at a high current density of 5 A g −1 are obtained. These results indicate that the MXene/MoSe 2  composite will be a high promising candidate for supercapacitors.