Fuel cells are electrochemical systems that convert the energy of a fuel into electricity. In the case of hydrogen-powered batteries, the reaction takes place with the oxygen of the air and the product formed is simply water, H2O. The PILOT-Hy project aims to develop PCFC (Protonic Ceramic Fuel Cell) fuel cell cells for integration into a stack where multi-element metal alloys (called high entropy alloys) can be tested as interconnectors. PCFC cells will be sintered with an intermediate cathode spray deposition step to optimise interfacial properties. They will be tested from the point of view of their electrical performance on a Probostat bench, and then on the short stack kit device consisting of cell-interconnector stacking at the ICB laboratory. The materials constituting the electrolyte will be developed at ICB by hydrothermal synthesis, their granularity will be adapted to the microstructure objectives of the cells. Electrolyte deposits will be carried out in collaboration with FEMTO-ST laboratory by magnetron spraying from appropriate targets on the electrodes. This project on the use of hydrogen as an energy carrier is part of the research related to the ENRgHy project of the Burgundy Franche-Comté Region labeled Hydrogen Territory.