Performance of La0.1Sr0.9Co0.8Fe0.2O3aI' and La0.1Sr0.9Co0.8Fe0.2O3aI'aCe0.9Gd0.1O2 oxygen electrodes with Ce0.9Gd0.1O2 barrier layer in reversible solid oxide fuel cells

La0.1Sr0.9Co0.8Fe0.2O3aI' (LSCF1982) and La0.1Sr0.9Co0.8Fe0.2O3aI'aCe0.9Gd0.1O2 (LSCF1982aGDC) composite oxygen electrodes with a GDC barrier layer are tested in yttria stabilized zirconia (YSZ) electrolyte-based reversible solid oxide cells (RSOCs). Three button cell assemblies (1: NiOaYS...

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Bibliographic Details
Published in:Journal of power sources 2013-10, Vol.239, p.361-373
Main Authors: Choi, Moon-Bong, Singh, Bhupendra, Wachsman, Eric, Song, Sun-Ju
Format: Article
Language:English
Subjects:
Barrier layers
Buttons
Electrochemical impedance spectroscopy
Electrodes
Electrolytic cells
Oxides
Solid oxide fuel cells
Yttria stabilized zirconia
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Summary:La0.1Sr0.9Co0.8Fe0.2O3aI' (LSCF1982) and La0.1Sr0.9Co0.8Fe0.2O3aI'aCe0.9Gd0.1O2 (LSCF1982aGDC) composite oxygen electrodes with a GDC barrier layer are tested in yttria stabilized zirconia (YSZ) electrolyte-based reversible solid oxide cells (RSOCs). Three button cell assemblies (1: NiOaYSZ|YSZ/GDC|LSCF1982; 2: NiOaYSZ/NiOaYSZ|YSZ/GDC|LSCF1982; and 3: NiOaYSZ/NiOaYSZ|YSZ/GDC|LSCF1982aGDC) are fabricated and their performance in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes are studied at different temperatures (600 less than or equal to T/ degree C less than or equal to 800). The use of porous NiOaYSZ functional layer between hydrogen electrode and electrolyte leads to improvements in SOFC and SOEC (SOFC/SOEC) performance by improving the diffusion of reacting species inside the electrode. The effect of nature of oxygen electrode on SOFC/SOEC performance is studied, which indicates LSCF1982 oxygen electrode gives better performance than LSCF1982aGDC composite oxygen electrode, but LSCF1982aGDC composite oxygen electrode is more durable during reversible SOFC/SOEC operations. Stability of the button cells is studied in galvanostatic SOEC operation for 72 h and in reversible SOFC/SOEC operations. Current-voltage (I-V) tests and Electrochemical Impedance Spectroscopy (EIS) measurements indicate that the button cells show stable operation in SOEC mode. But successive SOFC a SOEC a SOFC operations indicate that the cells are not completely reversible. The possible reason for poor reversibility is found to be related with the grain growth in LSCF1982-based oxygen electrodes.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2013.03.154