Electrochemical Performance of Prussian Blue and Analogues in Aqueous Rechargeable Batteries

Aqueous batteries offer lower cost compared to non-aqueous batteries and higher ionic mobility, thus potentially higher power, which are the driving forces for their commercialization. On the other hand, water-based electrolytes present a more limited voltage stability window (ca. 1.23 V) than organic electrolytes, what translates into storing lower energy densities than non-aqueous batteries. However, as we will see, there are several ways to enlarge this voltage window, such as modifying the salt chosen and its concentration.