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Prussian Blue Analogues: minimal synthesis modification causes significant differences in the electrochemical performances
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DOI：10.1016/j.electacta.2026.148960.png)
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Abstract
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The rise in energy demand and the limited availability of materials for manufacturing large-scale Li-ion batteries have spurred research into alternative technologies, including Na, Zn, K, and Al batteries. The quest for superior electrochemical performance has led to the development of new cathodes, such as Prussian Blue and its Analogues (PBAs). It is well common that PBAs synthesis parameters affect the structure and electrochemical performance obtained; however, when most published articles focus on parameters such as concentration and nature of the precursors, flow rate, temperature, or secondary salts addition, here we demonstrate the critical influence of a synthesis parameter - the aging, time before recovering the product after finishing the precursors addition - which correlation with the material performance has not been studied and arbitrary values, when are included, are used. Its influence on the electrochemical performance of sodium aqueous batteries based on PBAs - Nickel hexacyano ferrate - is analyzed here. Although there are minimal changes in material composition or morphology, a clear impact on the material's capacity to reversibly (de-)intercalate sodium into its openframework structure is demonstrated.
Keywords:
Prussian Blue Analogues
Nickel hexacyanoferrate
Sodium batteries
Synthesis
Electrochemical
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