N-Doped hollow Fe 0.4 Co 0.6 S 2 @NC nanoboxes derived from a Prussian blue analogue as a sodium ion anode.

Herein, a bimetallic sulfide Fe 0.4 Co 0.6 S 2 @NC nanobox was prepared via a simple two-step synthetic route. The N-doped carbon coated hollow nanobox was derived from a Prussian blue analogue (PBA) and applied for an SIB anode. As expected, it exhibits a high capacity (486.6 mA h g -1 at 0.1 A g -1 ) and displays an excellent cycling stability (230 mA h g -1 at 10 A g -1 after 900 cycles).