Prussian blue coupling with zinc oxide as a protective layer: an efficient cathode for high-rate sodium-ion batteries

Prussian blue coupled with zinc oxide has been synthesized via a facial heat treatment process. As a cathode for sodium ion batteries, the PB coupled with ZnO delivers an excellent rate performance, retaining 86.2 mA h g(-1) at 10 A g(-1) and a high reversible capacity of 89.9 mA h g(-1) at 0.2 A g(-1) after 500 cycles.