Suitability of strontium and cobalt-free perovskite cathodes with La9.67Si5AlO26 apatite electrolyte for intermediate temperature solid oxide fuel cells

Aluminium-doped lanthanum silicate (LSAO) apatite-type compounds have been considered as promising candidates for substituting yttria-stabilized zirconia (YSZ) as electrolytes for intermediate temperature solid oxide fuel cells (IT-SOFC). Nevertheless, not many materials have been reported to work a...

Full description

Saved in:
Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2020-10, Vol.49 (40), p.14280-14289
Main Authors: Robles-Fernandez, Adrian, Orera, Alodia, Merino, Rosa I, Slater, Peter R
Format: Article
Language:English
Subjects:
Aluminum
Apatite
Cathodes
Chemical compatibility
Chromium
Cobalt compounds
Composition
Copper
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrolytes
Electrolytic cells
Lanthanum
Manganese
Molten salt electrolytes
Nickel
Perovskite structure
Perovskites
Solid electrolytes
Solid oxide fuel cells
Strontium compounds
Structural analysis
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Aluminium-doped lanthanum silicate (LSAO) apatite-type compounds have been considered as promising candidates for substituting yttria-stabilized zirconia (YSZ) as electrolytes for intermediate temperature solid oxide fuel cells (IT-SOFC). Nevertheless, not many materials have been reported to work as cathodes in a LSAO apatite-based cell. In the present work, eight different strontium and cobalt-free compounds with a perovskite-type structure and the general composition LaM1−xNxO3−δ (where M = Fe, Cr, Mn; N = Cu, Ni; and x = 0.2, 0.3) have been tested. This study includes the synthesis and structural characterization of the compounds, as well as thermomechanical and chemical compatibility tests between them. Functional characterization of the individual components has been performed by electrochemical impedance spectroscopy (EIS). Apatite/perovskite symmetrical cells were used to measure area-specific resistance (ASR) of the half cell in an intermediate temperature range (500–850 °C) both with and without DC bias. According to its electrochemical behaviour, LaFe0.8Cu0.2O3−δ is the most promising material for IT-SOFC among the compositions tested since its ASR is similar to that of the traditional (LaxSr1−x)MnO3 (LSM) cathode.
ISSN:1477-9226
1477-9234
DOI:10.1039/d0dt02987d