Facile preparation of MoO 3 @Mo 2 CT x nanocomposite with high lithium storage performance by in situ oxidation

In this work, a new MoO @Mo CT nanocomposite was prepared from two-dimensional (2D) Mo CT MXene by oxidization in air, which exhibited wonderful lithium-storage performance as anodes of lithium-ion batteries (LIBs). The precursor Mo CT was synthesized from Mo Ga C by selective etching of NH F at 180 °C for 24 h. Thereafter, the Mo CT was oxidized in air at 450 °C for 30 min to obtain MoO @Mo CT nanocomposite. In the composite, generated MoO nanocrystals pillar the layer structure of Mo CT MXene, which increases the interlayer space of Mo CT for Li storage and enhances the structure stability of the composite. Mo CT 2D sheets provide a conductive substrate for MoO nanocrystals to enhance the Li accessibility. As anodes of LIBs, the final discharge specific capacity of the MoO @Mo CT composite was 511.1 mAh g at a current density of 500 mA g after 100 cycles, which is about 36.7 times that of pure Mo CT MXene (13.9 mAh g ) and 3.2 times that of pure MoO (159.9 mAh g ). In the composites, both Mo CT and MoO provide high lithium storage capacity and can enhance the performance of each other. Moreover, this composite can be made by a facile method of oxidation. Therefore, the MoO @Mo CT MXene nanocomposite is a promising anode of LIB with high performance.