I am working on Vanadium redox flow batteries (VRFB). In other redox flow batteries there is a problem of cross contamination of redox species across membrane.
I am using nafion 112 in VRFB and using V(IV) as catholyte and V(III) as anolyte both in 3M H2SO4 as supporting electrolyte.
So my question was that although in both compartment, vanadium ions are present across membrane and also they are in different oxidation states then why do cross contamination is less as compared to other redox flow batteries ?
In vanadium redox flow battery only one element acts as active material for both positive and negative side. So, due to crossover if catholyte moves to anolyte and/or vice-versa then it doesn't contaminate the system. In stead of vanadium if other element would be used, then it could contaminate the electrolyte. For example, contamination might be some unwanted or irreversible side reaction. Due to crossover of active material, one will loose capacity which can be retrieved further. That's why VRFB system is called cross-contamination free.
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