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La0.7Sr0.2Ni0.2Fe0.8O3 (LSNF), having thermochemical stability, superior ionic and electronic conductivity, and structural flexibility, was investigated as a cathode in SOECs.

High-temperature water electrolysis in a solid oxide electrolysis cell (SOEC) can be an efficient way of producing hydrogen, especially if it can be coupled with a renewable energy source. In this study, the performance of a nickel-doped, A-site deficient lanthanum strontium ferrite (La 0.7 Sr 0.2 FeO 3 ) was investigated as an SOEC cathode. Electrolysis of H 2 O was carried out using a cathode stream containing 3% H 2 O/He at 800 °C and at various current densities. It was found that La 0.7 Sr 0.2 FeO 3 has a lower Faradaic efficiency for hydrogen production than the Ni-doped cathode for which the efficiency reaches 100%. XRD shows that the undoped sample forms a nonconducting La 2 O 3 secondary phase which affects the electrochemical performance negatively. On the nickel-doped sample, however, a B-site metal phase and a Ruddlesden− Popper phase with mixed electronic and ionic conductivity are formed, which enhances the electrochemical performance of the cathode.