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Abstract In aqueous iron-based redox flow batteries (RFBs), there occurs a fatal performance degradation due to the formation of ferrihydrite via Fe(III) hydrolysis during long-term cycling. This paper describes an… Click to show full abstract
Abstract In aqueous iron-based redox flow batteries (RFBs), there occurs a fatal performance degradation due to the formation of ferrihydrite via Fe(III) hydrolysis during long-term cycling. This paper describes an organic-ligand complexation of Fe(II)/Fe(III), which allows a high stability and reversibility of the Fe(II)/Fe(III) redox couple in aqueous zinc-iron RFBs. The remarkable effectiveness of pyridine chosen as a best complexing ligand is compared to seven organic ligands through various experiments including cell-cycling tests. It is experimentally confirmed that the pyridine initially coordinated to a Fe(II) cation forms a much strong bonding despite pH
Journal Title: Electrochimica Acta
Year Published: 2020
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