Nowadays, one of the key drivers for the energy transition to a low-carbon scenario is the utilization of hydrogen as an energy vector. Its utilization represents a sustainable energy conversion route and a potential storage system for renewable energy sources, to overcome the limit of their intermittent behavior. Hydrogen can be produced by electrolysis of water (green hydrogen) and used as a fuel to generate electricity. High-temperature electrolyzers and fuel cells with ceramic-based electrolytes demonstrate to possess high conversion rates due to the high working temperatures employed. Solid Oxide Cells (SOCs) and Protonic Ceramic Cells (PCCs) work in the ranges 700 – 1000 °C and 400 – 700 °C, respectively.