Oxygen vacancies-rich iron-based perovskite-like electrodes for symmetrical solid oxide fuel cells

Oxygen vacancies-rich iron-based perovskite-like oxides LaxSr3-xFe2O7-? (x = 0, 0.25, 0.5) have been studied towards application as both anode and cathode materials for symmetrical solid oxide fuel cells (SSOFCs) at intermediate temperatures utilizing their excellent thermo-chemical structural stability. The conduction mechanism of LaxSr3-xFe2O7-? was investigated according to the effect of La content on electrical conductivity and oxygen nonstoichiometry. Consequently, LaxSr3-xFe2O7-? was used simultaneously as reversible symmetrical electrodes for YSZ electrolyte supported SSOFCs with GDC buffer layers. The maximum power density of LaxSr3xFe2O7-?-GDC symmetrical electrodes increased from 350 mW cm-2 to 480 mW cm-2 at 800 ?C, and the corresponding cell polarization resistance decreased from 0.18 ? cm2 to 0.16 ? cm2, respectively. The enhanced performance is attributed to the improved electrical conductivity and electro-catalytic activity by the partial substitution of Sr with La. These results demonstrate that new iron-based perovskite-like oxides are promising for applications in intermediate temperatures SSOFCs.

Automated summary

Iron-based perovskite-like oxides with oxygen vacancies were studied as both anode and cathode materials for symmetrical solid oxide fuel cells (SSOFCs), showing enhanced performance by partially substituting Sr with La to improve electrical conductivity and electro-catalytic activity. This suggests promising applications of these new materials in intermediate temperature SSOFCs.