Why are there no flow batteries with symmetric ferrocyanide electrolytes?
This article examines the technical challenges of creating symmetric flow batteries using ferrocyanide electrolytes, specifically addressing issues with solubility and chemical stability. It explains why common approaches, such as using chelating agents, often fail to produce a viable battery system.
Why it matters
Advancements in flow battery chemistry are vital for developing efficient, long-duration energy storage solutions for renewable energy grids.
If you have looked into flow batteries for any length of time, you will have found that the ferrocyanide/ferricyanide redox couple ( [Fe(CN) 6 ] 4− , Fe(CN) 6 ] 3− ) is one of the most widely used in the field. This is because this redox couple has very high redox stability, great kinetics, significant solubility (0.7-1.2M depending on the exact salts used) and a redox potential that is lower to that of the Fe 2+ /Fe 3+ redox couple (+0.22V and +0.5V respectively Vs saturated Ag/AgCl), with high stability under high pH conditions.
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