Intermediate temperature solid oxide electrolysis cell using LaGaO3-base oxide

► We applied NiFe-oxide composite for cathode of steam electrolysis using LaGaO3 electrolyte. ► Cathodic performance was strongly affected by oxide combined with NiFe. ► Among the oxides, it was found that NiFe-SDC and NiFe-LSFM are highly active for cathodic reaction in steam electrolysis. ► Decrease in cathodic overpotential can be explained by improved diffusion process.