Enhanced electrochemical performance and stability of (La,Sr)MnO3-(Gd,Ce)O2 oxygen electrodes of solid oxide electrolysis cells by palladium infiltration

► Effect of Pd infiltration on the activity and stability of LSM-GDC oxygen electrodes of SOEC is studied. ► Infiltrated Pd nanoparticles significantly promote the activity and stability of the LSM-GDC electrodes. ► Infiltrated Pd primarily promotes the oxygen surface diffusion and exchange of the reaction. ► The observed degradation of Pd-infiltrated LSM-GDC can be further improved by stabilization of the Pd phase.