Hydrogen offers a green and flexible option to face the challenges for energy transition, thus allowing to meet objectives of European and international policies for decarbonization. H2 can be produced from fossil fuels and biomass via steam methane reforming (SMR), partial oxidation (oil), gasification (coal), and by water electrolysis. Solid oxide cells (SOCs) devices are of great interest for clean and efficient power generation and for highly productive conversion of electricity to hydrogen, fuels and chemicals using high temperature electrolysis. Enhanced efficiency and durable electrochemical energy conversion in SOC systems can be achieved by suitable material choice and processing a reliable integration technology and an effective stack design.