All-iron redox flow battery in flow-through and flow-over set-ups: the critical role of cell configuration

Josh J. Bailey, Maedeh Pahlevaninezhad, H. Q.Nimal Gunaratne, Hugh O’Connor, Kate Thompson, Pranav Sharda, Paul Kavanagh, Oana M. Istrate, Stephen Glover, Peter A.A. Klusener, Edward P.L. Roberts*, Peter Nockemann*

*Corresponding author for this work

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Significant differences in performance between the two prevalent cell configurations in all-soluble, all-iron redox flow batteries are presented, demonstrating the critical role of cell architecture in the pursuit of novel chemistries in non-vanadium systems. Using a ferrocyanide-based posolyte, and a negolyte containing a hydroxylamine-based iron complex, higher maximum power density, energy efficiency, and electrolyte utilisation were observed with a flow-over cell that incorporated a carbon paper, compared with a flow-through configuration that used a graphite felt. Capacity fade was lower in the flow-over case, likely the result of a set-up with lower overpotentials, as indicated by polarisation curve analysis. Capacity fade in the flow-through case increased upon lowering current density, suggesting a different degradation pathway, dominated instead by electrolyte cross-over. These findings highlight the potential of novel non-vanadium chemistries in both flow-through and flow-over cells, prompting further research exploration of cell architectures.

Original languageEnglish
JournalEnergy Advances
Early online date07 May 2024
Publication statusEarly online date - 07 May 2024

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)

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