Postdoc Position Redox-targeted Flow Batteries

Empa - Swiss Federal Laboratories for Materials Science and Technology

Dübendorf, Switzerland

The research project focuses on the development of solid electrode composites, so-called boosters, for next-generation redox-targeted flow batteries. In these systems, soluble redox mediators dissolved in the electrolyte exchange charge with solid booster materials held in the storage tanks, decoupling energy density from active-material solubility while preserving the modularity and safety of aqueous flow batteries. The performance of such batteries hinges on the solid booster formulation, morphology, and the efficiency of charge transfer between mediator and solid under continuous flow.

Your task is to develop solid booster formulations with PFAS-free binders, in line with the sustainability goals of the project. You will explore compositions and pellet morphologies to optimize mass transport and reactivity with the mediator solution while maintaining mechanical stability, and characterize the thermal and chemical stability of components and formulations. You will apply in-situ diagnostics, in particular in-flow UV-Vis, to quantify mediator-booster reactivity and component dissolution during operation, developing a firm understanding of how material formulation and experimental parameters govern charge transfer at the liquid-solid interface.

To connect materials to devices, you will prototype booster-bed reactors from mL to L scale by 3D printing and support the transfer of promising formulations toward scalable, solvent-free processing. Material combinations will be validated in lab-scale flow batteries, benefiting from the characterization capabilities available at Empa.

The position is embedded in the Horizon Europe project FLOWBOOST, an international consortium advancing the technology from the laboratory toward a kW-scale prototype, offering close collaboration with academic and industrial partners across Europe.

We are looking for a self-motivated team player ready to work independently in Empa's vibrant international research environment. The ideal candidate holds a PhD in materials science, chemistry, or related fields, with a strong publication record. Prior experience in flow-cell electrochemistry, in-situ spectroscopy (UV-Vis, Raman, FTIR), or 3D printing and polymer processing is desired. Good spoken and written English is required, and basic German is an advantage.