An Investigation into Factors Affecting the Iron Plating Reaction for an All-Iron Flow Battery

The all-Iron flow battery utilizes the iron II/III redox couple at the positive electrode and the iron II/0 reaction at the negativeelectrode. Thestandard reduction potential oftheiron II/0 reaction is at −0.44V vs. NHE, suggesting that hydrogenevolution couldbe a significant factor in coulombic losses on the negative electrode. Methods of increasing the coulombic efficiency of iron platingare considered, such as anion concentration and electrolyte additives. The use of a chloride anion containing electrolyte showed lesshydrogenevolutionratesandfasterplatingkineticsthananelectrolytecontainingthesameconcentrationofsulfateanions.Increasingthe chloride concentration significantly reduced the hydrogen evolution observed on an iron electrode, and plating efficiencies of97% were demonstrated on a rotating rod electrode. The effect of complexing ligands on plating and hydrogen evolution was alsoinvestigated.© 2014 The Electrochemical Society. [DOI: 10.1149/2.0591501jes] All rights reserved.Manuscript submitted July 24, 2014; revised manuscript received October 8, 2014. Published November 18, 2014.

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