Blue energy, harvested by reverse electrodialysis, aims to convert the free energy from the mix of water of different salinities (river water and sea water for instance) into electricity. Its development relies on high-performance ion-exchange membranes combining high ionic selectivity with low electrical resistance. A major challenge is therefore to design a new generation of membranes that are simultaneously more efficient, less polluting, and less expensive. This internship will investigate how nanopore size and pore density affect membrane performance. The intern will study collective effects arising from interactions between neighboring pores, together with the influence of concentration boundary layers associated with fluid flow. The objective is to understand how these phenomena govern ion transport and to identify membrane architectures that optimize selectivity, resistance, and generated power. The project will be primarily experimental. The intern will prepare membranes through the adsorption of polyelectrolytes inside nanoporous PET membranes, and will then characterize their ionic selectivity, electrical resistance, and power output. Depending on the intern’s interests and background, the project may also include theoretical modelling and/or numerical simulations to interpret the experimental results and explore the influence of different pore geometries and densities.