| With the rapid development of economy,the energy storage and utilization will be more and more important to the progress of economy and society.Constructing advanced electrode materials with high gravimetric and volumetric performance toward alkali metal ion storage is of great significance for next-generation high-performance energy storage devices.Hence,we developed N-doped carbon coated ZnTe core-shell nanowires?ZnTe@C?by a facile ion-exchange and carbonization strategy.The novel nanowires consisting of uniform ZnTe nanowire core and thin N-doped carbon shell exhibit superior electrochemical performance in metal ion storage.As an anode material for sodium ion batteries?NIBs?,the nanocomposites can maintain a capacity of 423 mA h g-1 after 100cycles at a current density of 50 mA g-1,and 300 mA h g-1 after 250 cycles at 200 mA g-1.Electrochemical dynamic studies revealed that Na ion storage mechanism in the as-prepared ZnTe@C nanowires is pseudocapacitance-dominated process,with the favorable high-rate performance.Furthermore,the amorphous N-doped carbon layer in the heterostructured ZnTe@C nanowires can not only afford fast charge transfer paths,but also effectively keep the structural and electrical integrity of the ZnTe,leading to superior cycling stability.We synthesized a three-dimensional carbon-coated tubular tin phosphide nanocomposite by the simple hydrothermal and phosphorization method.The carbon nanotubes used as the skeleton in the structure can improve the conductivity of the material while the outermost layer of carbon can inhibit the volume expansion of Sn3P4,keeping the material structural stability.The as-prepared material delivers a high reversible specific capacity of 300 mA h g-1 after 2000 cycles at 200 mA g-11 for NIBs.The proposed strategy here could provide a new avenue for designing electrode materials with excellent electrochemical performance including cycling life and rate capability towards energy storage systems. |
PDF Full Text Request