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Prussian blue analogues (PBAs) have gained significant popularity as cathode materials for sodium-ion batteries (SIBs) due to their remarkable features such as high capacity and convenient synthesis. However, PBAs usually suffer from kinetic problems during the electrochemical reactions due to sluggish Na+ diffusion in the large crystals, resulting in low-capacity utilization and inferior rate capability. In this study, we present a facile etching method aiming at activating the sodium storage sites and accelerating the Na+ transport of Na2NiFe(CN)6 (denoted as NaNiHCF) by precisely controlling its morphologies. A progressive corner passivation phenomenon occurred in NaNiHCF during the etching process, which led to a substantial augmentation of the specific surface area as the morphology transitioned from a standard cube to a dice shape. Notably, by controlling the etching time, the obtained NaNiHCF-3 electrode exhibited boosted electrochemical performance with high reversible capacity

Cathode materialsA nife cn 2 6Prussian blue analoguesSodium ion batteries