Nanostructured potassium and sodium ion incorporated Prussian blue frameworks as cathode materials for sodium-ion batteries.

Nanostructured KxNayMnFe(CN)6 (x + y ≤ 2) has been synthesized via a facile co-precipitation method. As a cathode, KNMF-3 presents a highly reversible capacity of 133.3 mA h g-1 at 20 mA g-1 as well as an excellent rate capacity of 92.0 mA h g-1 at 600 mA g-1. This material could be a good candidate as a cathode for sodium-ion batteries.