INVESTIGADORES
SERQUIS Adriana Cristina
artículos
Título:
Effect of cation demixing on the electrochemical performance of LSCFO cathodes for SOFCs
Autor/es:
L. BAQUÉ; A. SOLDATI; H. TROIANI; A. SERQUIS
Revista:
ECS Transactions
Editorial:
Electrochemical Society, Inc.
Referencias:
Año: 2014 vol. 64 p. 11 - 16
ISSN:
1938-5862
Resumen:
The commercialization of Solid oxide fuel cells (SOFCs) is stillhindered by their cost and long term degradation. One of the mostcommon degradation mechanisms of La1-xSrxFe1-yCoyO3-d(LSCFO) cathodes reported in literature is element demixing. Inthis work, the degradation of LSCFO cathodes deposited onCe1-xGdxO2-d electrolytes at 800°C in air for 50 h was investigatedby electrochemical impedance spectroscopy (EIS), scanningelectron microscopy (SEM) and transmission electron microscopy(TEM). EIS spectra from LSCFO cathodes present twocontributions: one at high frequency and another at low frequency.The high frequency contribution remains invariable during theageing treatment while the low frequency contributioncontinuously increases. The formation of small segregates wasobserved after the ageing treatment. Energy dispersivespectroscopy analysis reveals that these segregates wereparticularly poor in Sr.
