High Temperature Co‐electrolysis for Power‐to‐X

High temperature solid oxide cells are attractive electrochemical reactors to perform simultaneous reduction of steam and CO 2 into syngas with the possibility of delivering a tailored composition to downstream processes. The main thermodynamic considerations, performance and impedance curves of electrolyte supported cells in co‐electrolysis are shown as a function of temperature and pressure. In dynamic operation, the thermal changes that the reactor undergoes appear stronger in co‐electrolysis mode than in steam electrolysis and should be considered in the development of operating strategies.