| Abstract: | Owing to excellent conductivity and abundant surface terminals,MXene-based heterostructures have been intensively investigated as energy storage materials.However,elaborate design of the structure and composition of MXene-based hybrids towards superior electrochemical performance is still challenging.Herein,we present an ingenious leaf-inspired design for preparing a unique Sb_2S_3/nitrogen-doped Ti_3C_2T_x MXene (L-Sb_2S_3/Ti_3C_2) hybrid.In-situ TEM observations reveal that the leaflike Sb_2S_3 nanoparticles with numerous mesopores can well relieve the large volume changes via an inward pore filling mechanism with only 20%outward expansion,whereas highly conductive N-doped Ti_3C_2T_x nanosheets can serve as the robust mechanical support to reinforce the structural integrity of the hybrid.Benefiting from the structural and constituent merits,the L-Sb_2S_3/Ti_3C_2anode fabricated exhibits a fast sodium storage behavior in terms of outstanding rate capability (339.5 mA h g~(-1)at 2,000 mA g~(-1)) and high reversible capacity at high current density (358.2 mA h g~(-1)at 1,000 mA g~(-1)after 100 cycles).Electrochemical kinetic tests and theoretical simulation further manifest that the boosted electrochemical performance mainly arises from such a unique leaf-like Sb_2S_3 mesoporous nanostructure with abundant active sites,and enhanced Na~+ adsorption energy on the heterojunction formed between Sb_2S_3 nanoparticles and Ti_3C_2 matrix. |
