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As the energy focus shifts from fossil fuels to renewable sources and smart -grid technology, energy storage becomes a main requirement. Redox flow battery (RFB) technology has seen renewed interest for such a purpose in recent years [1, 2]. Several chemistries for flow batteries exist, such as all -vanadium, iron-chrome, and bromine-polysulfide [3]. One such technology is the all iron hybrid RFB [4]. This chemistry involves plating iron from Fe(II) on the negative electrode, and the Fe II/III reaction on the positive elect rode, for a nominal cell voltage of 1.2 V. Because the negative reaction occurs at -0.44 V vs. NHE, H2 evolution becomes a significant challenge, which can b e mitigated by raising the electrolyte pH above 3. This change in pH, however, presents a problem on the positive side of the battery as iron(III) quickly precipitates as Fe(OH) 3 at pHs greater than 2 [5]. This precipitation can be prevented through the use of complexing ligands within the electrolyte.

Electrokinetic Studies of Iron-Ligand Complexes for An All-Iron Redox Flow Battery Application