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New paper: Effects of operating temperature on kinetics and performance of iron/iron redox flow batteries

Effects of operating temperature on kinetics and performance of iron/iron redox flow batteries

The all-iron redox flow battery (IRFB) offers a promising low-cost solution for large-scale energy storage; however, its performance is compromised by parasitic reactions, particularly hydrogen evolution. The impact of operating temperature on lab-scale cell performance is a critical yet underexplored area. This study systematically examines the influence of temperature on an IRFB utilizing a 1.5 M FeCl2, 2 M NH4Cl, and 0.2 M HCl electrolyte. Electrochemical characterization was performed over the temperature range of 20–80 °C, while lab-scale cell cycling stability was assessed over 20–50 °C. Electrochemical analysis indicated that elevated temperatures significantly enhance reaction kinetics, as evidenced by a nearly fivefold increase in the diffusion coefficient of the Fe2+/Fe3+ redox couple, rising from 1.89 × 10−6 cm2 s−1 at 20 °C to 8.93 × 10−6 cm2 s−1 at 80 °C.

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New Paper published about “A multi-parameter analysis of iron/iron redox flow batteries: effects of operating conditions on electrochemical performance”

Challuri et al.

Iron/iron redox flow batteries (IRFBs) are emerging as a cost-effective alternative to traditional energy storage systems. This study investigates the impact of key operational characteristics, specifically examining how various parameters influence efficiency, stability, and capacity retention. IRFB systems with a volume of 60 mL per tank (20.25 Ah L−1) demonstrated superior capacity utilization, achieving a coulombic efficiency (CE) of up to 95% and an energy efficiency (EE) of 61% over 25 charge/discharge cycles. In contrast, systems with lower capacity utilization in larger electrolyte volumes (5.67 Ah L−1) required more charge/discharge cycles to reach the optimal pH-induced kinetic benefits due to increased proton content.

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New Project Started: UltraThinFlow (UTF)

2026 UTF Kickoff

With funding from the Federal Ministry of Research, Technology and Space, Fraunhofer ICT, SCHMALZ, NONWOVEN and University Bayreuth will develop a new ultra-thin cell design for flow batteries in the coming three years. Project start was 01.04.2026.