A post-doctoral researcher at Queen's University Belfast has produced a 3D-printed iron-based flow battery cell for approximately £74. Commercial versions of comparable scale cost between £2,000 and £3,000.
The cell stores energy in iron-containing liquids instead of solid electrodes. Iron remains cheaper and simpler to source than the vanadium employed in many existing flow battery designs. This substitution addresses one of the central cost barriers that have slowed wider adoption of the technology for stabilising intermittent renewable generation.
Developers have published the complete design free of charge, accompanied by a step-by-step assembly guide. The intention is to allow laboratories worldwide to replicate the cell exactly, removing variability that has complicated comparative testing and slowed collective progress.
Standardisation to accelerate deployment
Researchers involved state that uniform hardware can compress the timeline from laboratory concept to field deployment. Flow batteries, which rely on flowing liquid electrolytes rather than fixed electrodes, are viewed as particularly suited to long-duration storage required to balance wind and solar output. Yet progress has been hampered by inconsistent experimental platforms and high material costs.
I started 3D-printing them and I made lots of little tweaks. After a lot of trial and error, eventually these started to work really well.
Dr Hugh O'Connor, the post-doctoral researcher who led the printing iterations, described the process of incremental refinement that produced a functional cell. His colleague Dr Josh Bailey, an Illuminate Fellow at the university's School of Chemistry and Chemical Engineering, placed the work in a broader context.
We really honestly believe that flow batteries can be accelerated by these reproducibility studies and that the technology can be deployed more quickly if we're all using the same standards. If we're all going to get to 2050 and be at net zero, a lot more of our electricity needs to be stored in technologies like flow batteries.
The announcement, made on 20 July 2026, underscores how targeted research initiatives can deliver practical advances without reliance on central mandates. By lowering the entry barrier for other teams and focusing on abundant materials, the project illustrates the mechanics of innovation that improve energy security through reduced costs and faster iteration cycles. Whether the standardised cell translates into commercial scale will depend on further validation, yet the open release itself removes one procedural obstacle that has long slowed the sector.
