BEST4Hy focuses on the development and validation of existing and novel recycling processes for two key fuel cell and hydrogen products: proton exchange membrane fuel cells (PEM FC) and solid oxide fuel cells (SOFC). The project aims to adapt two existing recycling processes applied already to other technologies and to validate a novel dismantling process for PEMFC. Furthermore, a novel SOFC recycling technology will be proved. At the end of the processes, the materials will be validated in terms of quality and performance when re-used in new components and in new stacks, demonstrating the overall efficiency of recycling. Ambitious targets for recycled content in new stacks/cells have been set and will be validated by fuel cell producers, to prove the viability of higher value, closed loop recycling. Environmental impact and cost-benefits evaluations on the proposed technologies will be performed. This will support a more efficient use of raw materials, including critical resources, and it will contribute to improve the end-of-life treatment of the hydrogen technologies and to foster a circular economy approach within the sector.