Synthesis of a hollow MoSe₂@MXene anode material for sodium-ion batteries

MXene and MoSe₂ as a novel two-dimensional transition metal carbide and selenide, respectively, are widely used in battery electrodes. In this study, MoSe₂ nanoflakes were grown in situ on hollow MXene spheres via a hydrothermal method. The obtained hollow 3D spherical MoSe₂@MXene composite exhibits outstanding rate performance and cycling stability as the sodium-ion battery anode. At a current density of 1 A g^-1, it achieves a specific capacity of 350.7 mA h g^-1 after 1000 cycles with a retention rate of 93.7%. Even at a high current density of 10 A g^-1, the specific capacity remains at 224.2 mA h g^-1. The outstanding electrochemical performance of the MoSe₂@MXene composite is primarily attributed to the synergistic interaction between MoSe₂ and the MXene, which significantly reduces the self-aggregation of the MXene and MoSe₂ and effectively enhances the diffusion and migration rates of sodium ions.