You Tuber Video on an open source all Iron battery
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This guy did some videos for an all iron static battery. Here is the final version video and info page:
https://www.hardware-x.com/article/S2468-0672(25)00007-0/fulltext
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Nice find! Peter Allen has been at it for a while. I'd read his previous papers but not this one. A quick scan shows they are using an ion-exchange membrane, which @danielfp248 and I try to avoid if we can, since they are often the weak point of systems that rely on them.
Crossover of the mediators through the membrane will degrade performance. The possibility of this unwanted feature was examined by cyclic voltammetry on an electrochemical cell divided by the Fumasep FAS-50 anion exchange membrane in the 2 M KCl 20 % (v/v) EG AIB 3.0 electrolyte. The initial concentrations were 10 mM MV2+ in the left chamber and 10 mM ABTS2- in the right. A constant potential of 1.25 V was applied across the cell with 6.25 cm2 graphite electrodes for 24 h. This simulates the AIB 3.0 conditions. After the 24 h period CV was performed on catholyte to evaluate MV crossover and vice versa. We found no crossover through the membrane by the cyclic Voltammetry experiments.
I like how everything is commercially available at scale. There are quite a few organic flow battery startups that have tried to use methyl viologen as well like they do in this paper. I am curious what @danielfp248 thinks
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The cost per kWh of this is too high, the use of organic materials and ion exchange membranes puts this closer to what people do in academia and further from the cells that can be reasonably fabricated using DIY approaches. The use of an ion exchange membrane likely reduces the lifetime of this cell a lot. For a static cell, I think the sulfuric acid Cu/Mn battery we have discussed before is far more promising. That chemistry requires no exchange membranes, uses only commodity inorganic materials and cycles to 30-40Wh/L.
For pure Fe batteries I am much more inclined to the Fe flow batteries.
