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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
18 Mar 2024
Accepted
01 May 2024
First published
07 May 2024
This article is Open Access
Creative Commons BY license

Energy Adv., 2024, Advance Article

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

J. J. Bailey, M. Pahlevaninezhad, H. Q. N. Gunaratne, H. O’Connor, K. Thompson, P. Sharda, P. Kavanagh, O. M. Istrate, S. Glover, P. A. A. Klusener, E. P. L. Roberts and P. Nockemann, Energy Adv., 2024, Advance Article , DOI: 10.1039/D4YA00179F

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