On November 25th, 2025, the REDHy project held its first webinar, titled “Electrolysis and Redox Flow Batteries: Combining the Two Worlds”, where leading experts discussed the integration of novel electrolysis technologies with redox flow battery systems. The online event attracted participants from both research and industry, providing insights into the latest electrochemical methods and system innovations.
The webinar began with an introduction to redox flow batteries and water electrolysis, covering vanadium redox flow systems, CO₂ reduction, hydrogen evolution processes, and recent advances and challenges in water electrolysis, including the development of porous transport layers for anion exchange membrane (AEM) electrolyzers.
The second part highlighted innovations within the REDHy project, such as 3D-printed electrodes, optimized CROCs, CRM-free catalysts, advanced bipolar membrane designs, and a hybrid electrolysis system with decoupled gas evolution.
During the panel discussion, the speakers addressed current challenges of redox flow systems for electrolysis. Key points included system costs, the importance of real load profiles and operational conditions, and the role of mediator liquids and gas crossover. While crossover was not considered a major issue in hybrid systems, hydrogen still needs to become cost-effective to achieve market relevance. Questions from webinar participants were also addressed.
The webinar concluded with a summary of the main insights and next steps presented by Tobias Morawietz (DLR), emphasizing the importance of practical testing under real operational conditions to accelerate the adoption of these technologies.
