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Oxygen vacancies-rich iron-based perovskite-like electrodes for symmetrical solid oxide fuel cells.
- Source :
-
Ceramics International . May2021, Vol. 47 Issue 9, p12916-12925. 10p. - Publication Year :
- 2021
-
Abstract
- Oxygen vacancies-rich iron-based perovskite-like oxides La x Sr 3-x Fe 2 O 7- 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 La x Sr 3-x Fe 2 O 7- δ was investigated according to the effect of La content on electrical conductivity and oxygen nonstoichiometry. Consequently, La x Sr 3-x Fe 2 O 7- δ was used simultaneously as reversible symmetrical electrodes for YSZ electrolyte supported SSOFCs with GDC buffer layers. The maximum power density of La x Sr 3-x Fe 2 O 7- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 47
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 149417601
- Full Text :
- https://doi.org/10.1016/j.ceramint.2021.01.154