Universal Source-Template Route to Metal Selenides Implanting on 3D Carbon Nanoarchitecture: Cu_2-xSe@3D-CN with Se-C Bonding for Advanced Na Storage

The development of high-performance sodium ion batteries (SIBs) is heavily relied on the exploration of the appropriate electrode material for Na+ storage, which ought to feature merits of high capacity, easy-to-handle synthesis, high conductivity, expedite mass transportation, and stable structure upon charging-discharging cycle. Herein, a universal source-template method is reported to synthesize a variety of transition metal (e.g., V, Sb, W, Zn, Fe, Co, Ni, and Cu) selenides implanting on N doped 3D carbon nanoarchitecture hybrids (MmSen@3D-CN) with powerful Se-C bonding rivet. Benefiting from the superior architecture and potent Se-C bonding between Cu2-xSe and N-doped 3D carbon (3D-CN), the Cu2-xSe@3D-CN nanohybrids, as anode of SIBs, show high capacity, high-rate capability, and long-cycle durability, which can deliver a reversible capacity of as high as 386 mAh g(-1), retain 219 mAh g(-1) even at 10 A g(-1), and run durably over thousands of charging-discharging cycles. The Cu2-xSe@3D-CN as anode is also evaluated by developing a full SIB by coupling with the Na3V2(PO4)(3) cathode, which can deliver high energy density and show excellent stability, shedding light on its potential in practical application.