Queen’s University Belfast Researchers Develop Affordable 3D-Printed Flow Battery

For years, the promise of renewable energy has been hampered by a simple, stubborn reality: the sun does not always shine, and the wind does not always blow. While lithium-ion batteries often dominate the conversation regarding storage, the researchers say they are less suitable for the long-duration applications required to stabilize national power grids. Instead, scientists are turning toward flow batteries, which store energy in liquids rather than solid electrodes.

However, the development of this technology has been stifled by high costs and a reliance on vanadium, a metallic element that is geographically concentrated and economically volatile. A team at Queen’s University Belfast (QUB) is now attempting to change the trajectory of that research by providing a low-cost, standardized cell to the international scientific community.

From PhD Project to Global Research Standard

The breakthrough began when Dr. Hugh O’Connor, a post-doctoral researcher at QUB, discovered that purchasing a commercial flow battery cell for his doctoral studies would cost between £2,000 and £3,000. Faced with this barrier, he began experimenting with 3D-printing his own components.

“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, researcher at Queen’s University Belfast

The disparity in results across different laboratories was a major hurdle. Researchers were using different equipment and methods, making it nearly impossible to compare data reliably. By distributing his design, which costs roughly £74 to produce, O’Connor and his colleague Dr. Josh Bailey have enabled over 35 research groups—including teams at MIT, Harvard, and Cambridge—to conduct reproducible studies using the same hardware.

Standardizing the Path to Net Zero

The “Ikea-style” instruction manual accompanying the 3D-printed kits was a deliberate choice to ensure consistency. The design utilizes about ten components, including a membrane, gaskets, electrodes, and current collectors. According to Dr. Bailey, the goal is to make long-duration energy storage more reliable so that it can be deployed more quickly. With renewable energy currently accounting for only around 16 percent of overall energy use in the UK and Ireland, the researchers argue that the transition to storage technologies like iron-based flow batteries is essential to reaching 2050 net-zero targets.

Bondada Engineering and Grid-Scale Industrial Adoption

While the QUB team focuses on laboratory standardization, industrial implementation is scaling up elsewhere. On July 20, it was announced that Bondada Engineering Limited secured an order from NTPC Renewable Energy for a 100 MWh Vanadium Redox Flow Battery (VRFB) project at the Khavda Solar Park in Gujarat. This project marks the first and largest grid-scale deployment of its kind in Bharat.

The project highlights a clear divide in the current battery landscape: the QUB team is working to democratize research and reduce reliance on vanadium through iron-based alternatives, while large-scale industrial players continue to utilize vanadium for high-capacity grid storage. According to Rear Admiral R. Sreenivas, Group Chief Executive Officer of Bondada Engineering, the project is a defining milestone in the country’s energy transition, intended to strengthen energy security by reducing dependence on imported cells.

The Road Ahead for Energy Storage

The contrast between these two efforts—one centered on grassroots, open-source standardization and the other on massive, industrial-scale infrastructure—reflects the multifaceted approach required to move away from fossil fuels. As the Nation aims to deploy approximately 236 GWh of battery storage by 2030, the ability to both lower costs for researchers and scale hardware for the grid remains a primary challenge.

For the team at Queen’s University Belfast, the decision to provide their design to the international community for free was a calculated move to prioritize long-term impact over immediate monetization. As Dr. O’Connor noted, they saw the initiative as an opportunity to grow our network rather than make a small amount of money. Whether these standardized, low-cost cells can successfully bridge the gap to larger, grid-ready applications remains the critical question for the next phase of renewable energy development.

Sources: bbc.co.uk, ca.news.yahoo.com.