Nanostructured potassium and sodium ion incorporated Prussian blue frameworks as cathode materials for sodium-ion batteriesElectronic supplementary information (ESI) available: Experimental section, TEM, HRTEM images, and SAED patterns of KNMF-0, KNMF-1, and KNMF-2, respectively; TG/DTA of the four samples; and CV, galvanostatic charge and discharge curves, and EIS for KNMF-0, KNMF-1, and KNMF-2, respectively. See DOI: 10.1039/c7cc02303k

Nanostructured K x Na y MnFe(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. Nanostructured K x Na y MnFe(CN) 6 ( x + y ≤ 2) has been synthesized via a facile co-precipitation method.