Electrolysis of H2O and CO2 in an oxygen-ion conducting solid oxide electrolyzer with a La0.2Sr0.8TiO3+δ composite cathode

► La0.2Sr0.8TiO3+δ is a promising cathode of SOE at intermediate temperature. ► The electrolysis of H2O and CO2 cathode is efficient in SOE with a La0.2Sr0.8TiO3+δ. ► The main process is reduction of La0.2Sr0.8TiO3+δ at low voltages.