Abstract
Prussian blue analogues (PBAs) are considered to be one of the most promising cathode materials for aqueous zinc-ion batteries (AZIBs). However, the low specific capacity due to defects and low activity has become the major problem limiting their application. In this work, a potassium vanadyl hexacyanoferrate K0.37VO[Fe(CN)6]0.61·2.6H2O was synthesized by ethanol-assisted co-precipitation. Controlled growth by ethanol addition results in smaller particle size and fewer defects in K0.37VO[Fe(CN)6]0.61·2.6H2O, leading to excellent zinc ion storage properties. The K0.37VO[Fe(CN)6]0.61·2.6H2O cathode material exhibits a high specific capacity of 190 mAh·g−1 at 0.1 A·g−1 and an outstanding rate performance of 160 mAh·g−1 at 2 A·g−1. Ex-situ characterization technologies reveal that the zinc-ion storage process is involve with redox reaction of Fe2+/Fe3+ and V3+/V4+/V5+, as well as phase transition.
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