Performance and structural stability of Gd0.2Ce0.8O1.9 infiltrated La0.8Sr0.2MnO3 nano-structured oxygen electrodes of solid oxide electrolysis cells

•Infiltration GDC-LSM oxygen electrodes are developed for solid oxide electrolysis cells.•Infiltrated GDC nanoparticles form an interconnected, continuous and porous network.•GDC network expands the reaction sites, mitigating the delamination problem.•GDC-LSM oxygen electrodes show excellent stability under SOEC operating mode.

Effect of Gd0.2Ce0.8O1.9 (GDC) infiltration on the performance and stability of La0.8Sr0.2MnO3 (LSM) oxygen electrodes on Y2O3-stabilized ZrO2 (YSZ) electrolyte has been studied in detail under solid oxide electrolysis cell (SOEC) operating conditions at 800 °C. The incorporation of GDC nanoparticles significantly enhances the electrocatalytic activity for oxygen oxidation reaction on LSM electrodes. Electrode polarization resistance of pristine LSM electrode is 8.2 Ω cm2 at 800 °C and decreases to 0.39 and 0.09 Ω cm2 after the infiltration of 0.5 and 1.5 mg cm−2 GDC, respectively. The stability of LSM oxygen electrodes under the SOEC operating conditions is also significantly increased by the GDC infiltration. A 2.0 mg cm−2 GDC infiltrated LSM electrode shows an excellent stability under the anodic current passage at 500 mA cm−2 and 800 °C for 100 h. The infiltrated GDC nanoparticles effectively shift the reaction sites from the LSM electrode/YSZ electrolyte interface to the LSM grains/GDC nanoparticle interface in the bulk of the electrode, effectively mitigating the delamination at the LSM/YSZ interface. The results demonstrate that the GDC infiltration is an effective approach to enhance the structural integrity and thus to achieve the high activity and excellent stability of LSM-based oxygen electrode under the SOEC operating conditions.

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