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

作者：Ling, Yihan^*; Li, Tian; Yang, Yang; Tian, Yunfeng; Wang, Xinxin; Chen, Kaixuan^*; Dong, Dehua; Chen, Yan; Amezawa, Koji

来源：Ceramics International, 2021, 47(9): 12916-12925.

DOI：10.1016/j.ceramint.2021.01.154

• Symmetrical solid oxide fuel cells
• Iron-based perovskite-like oxide
• Conduction mechanism
• Oxygen nonstoichiometry
• GDC buffer layers

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.

• 单位
  1