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

Yihan Ling, Tian Li, Yang Yang, Yunfeng Tian, Xinxin Wang, Kaixuan Chen, Dehua Dong, Yan Chen, Koji Amezawa

Research output: Contribution to journalArticlepeer-review

Abstract

Oxygen vacancies-rich iron-based perovskite-like oxides LaxSr3-xFe2O7-δ (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-δ was investigated according to the effect of La content on electrical conductivity and oxygen nonstoichiometry. Consequently, LaxSr3-xFe2O7-δ was used simultaneously as reversible symmetrical electrodes for YSZ electrolyte supported SSOFCs with GDC buffer layers. The maximum power density of LaxSr3-xFe2O7-δ-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 Ω cm2 to 0.16 Ω 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.

Original languageEnglish
Pages (from-to)12916-12925
Number of pages10
JournalCeramics International
Volume47
Issue number9
DOIs
Publication statusPublished - 2021 May 1

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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