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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA shared cell design does not guarantee comparable flow-battery results: laboratories can follow the same broad test brief and still use different electrochemical protocols. In an eight-group interlaboratory study described by Josh Bailey in Chemistry World on 1 June 2026, polarisation procedures differed across all participating groups, while cycling and impedance measurements also varied. The practical lesson is to report the protocol and setup in enough detail for others to reproduce them—and to treat published performance comparisons cautiously when those details are missing.
Why researchers began comparing their methods
At the 2024 UK Flow Battery Network Annual Symposium, MIT researcher Fikile Brushett described a familiar problem: difficulty reproducing performance metrics reported in the literature. Researchers at the meeting recognised that more robust, consistent, and accessible testing practices could help the field.
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Queen’s University Belfast and MIT then worked with researchers from Queen Mary University of London, Eindhoven University of Technology, Harvard University, the University of Cambridge, and the University of Manchester on an interlaboratory study. The eight groups received components for Hugh O’Connor’s low-cost, 3D-printable flow-battery cell design, along with an assembly guide. Each was asked to perform charge–discharge cycling, polarisation curve analysis, and electrochemical impedance spectroscopy. Some parameters were specified; others were left to participants. The groups’ procedures and data were collected in a post-experiment survey. (Josh Bailey, Chemistry World, 1 June 2026)
What the study found—and what it could not establish
Polarisation procedures were not uniform
All eight groups used slightly different protocols for polarisation testing. That matters because a polarisation curve reflects how a cell performs under a particular measurement procedure; curves are harder to compare when the procedures differ or are not fully reported. Bailey argues for a standardised approach to polarisation curve analysis, drawing a parallel with practices established for fuel-cell and electrolyser testing.
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Cycling and impedance results also varied
Groups largely tested charge–discharge cycling in similar ways, but the account reports variability of ±9.2% in electrolyte utilisation and ±2.5% per day in capacity decay. Impedance measurements showed a wide range of area-specific resistance values for ohmic, charge-transport, and mass-transport losses, even though groups used the same equivalent-circuit model.
These results show variation within the study; they do not identify a single setup difference as the cause. Bailey notes that the eight-group study could not unequivocally attribute between-group differences to the measured participant variability. The figures should therefore be read as findings from this interlaboratory effort, not as universal uncertainty ranges for flow-battery testing.
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Which setup details may contribute to variation
Survey information pointed to electrical connections and electrolyte-tank configuration as possible sources of error. Follow-up investigations by the two leading institutions examined two- and four-point probe connections, cable length, tube placement, and stirring.
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- Electrical connections: Bailey reports that poor connections may account for an appreciable proportion of variable ohmic losses.
- Tubing and mixing: Tubing that allows fluid to bypass part of the intended path may affect electrolyte utilisation, at least when the electrolyte is not stirred.
These are plausible contributors, not a complete causal explanation for the differences across the eight groups. They are useful checks for researchers designing a setup or documenting one for others.
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Five practical steps for more reproducible testing
- Use a four-point probe connection. Keep connectors clean and firmly attached to the current collectors.
- Stir the electrolyte where possible. Mixing can promote homogeneity and may mitigate possible effects of fluid bypass. A stirrer is an optional setup aid, not a universal fix.
- Keep inlet and outlet tubing apart. This is especially important if stirring is not possible.
- Report the exact electrochemical protocol. Specify the procedure used for polarisation curves and other electrochemical data rather than relying on a broad test label.
- Document the setup and chosen parameters. Include enough detail for another laboratory to understand and reproduce the experiment.
What to check when comparing published results
Before treating two flow-battery results as directly comparable, check whether the papers describe the same relevant methods—not just the same cell design or the same test name. Focus on the polarisation protocol, electrical connection configuration, electrolyte mixing, tubing layout, and completeness of the setup and parameter reporting. If those details are absent or differ, the curves and metrics may not represent an equivalent measurement.
Bailey’s account also reported that a larger follow-up study involving almost 40 researchers worldwide was underway at the time of publication in June 2026. That is a time-specific status update, not confirmation of the project’s current status.
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A collaborative response to a shared problem
Bailey, an Illuminate Fellow at Queen’s University Belfast researching materials and protocols for fuel cells, water electrolysers, and flow batteries, described the effort as constructive rather than adversarial: “At the outset, we were concerned that this kind of study might be perceived as a critique of the field. Instead, we saw our scientific community at its best: coming together openly and constructively to improve a technology we believe has an important role to play in the sustainable energy transition.”
The underlying study is cited in Bailey’s account as H. O’Connor et al., Energy & Environmental Science (2026), 19, 3323, DOI 10.1039/d5ee07103h.
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