摘要
As a layered two-dimensional material,MoSe_(2)exhibits interlayer-tunable properties and exceptional theoretical capacities,making it a promising candidate for sodium/potassium ion storage systems.Nevertheless,its inadequate conductivity and irreversible reactions during charge and discharge seriously affect its electrochemical performance.Herein,a hierarchical interlayer-expanded MoSe_(2)/C(IE-MoSe_(2)/C)hybrid architecture with interlinked hollow nanospheres is engineered via a two-stage fabrication process combining hydrothermal self-assembly and controlled pyrolysis.The interlayer spacing increases to 1.02 nm,which accelerates the transport of sodium and potassium ions.Additionally,the strong interface between carbon and MoSe_(2)improves the conductivity,thereby enhancing the electrochemical kinetics of sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).On the other hand,the unique hierarchical IE-MoSe_(2)/C structure with hollow nanospheres can effectively mitigate variations in volume during cycling.Thus,IE-MoSe_(2)/C exhibits outstanding electrochemical characteristics as an anode material for SIBs and PIBs.Specifically,IE-MoSe_(2)/C exhibits better rate capability(98 mAh g^(−1)at 20 A g^(−1)in SIBs)and cycling performance(269/174 mAh g^(−1)at 2.0/5.0 A g^(−1)over 1100 cycles in SIBs and 133/96 mAh g^(−1)at 1.0/2.0 A g^(−1)over 1000 cycles for PIBs).Additionally,at 0.5C,the full cell of IE-MoSe_(2)/C||Na_(3)V_(2)(PO_(4))_(3)can display a consistent capacity of 93 mAh g^(−1),demonstrating the potential for future practical applications.
基金
support from the National Natural Science Foundation of China(Grant No.52271208 and 51972092)
the Fundamental Research Funds for the Central Universities(Grant No.JZ2024HGTG0305).
