Abstract
Oxygen electrodes prepared by infiltration of yttria stabilized zirconia backbone with Ce0.8Gd0.2O1.95 barrier layer and LaNi1-xCoxO3-δ
(x = 0.4 to 0.7) catalyst for application in reversible solid oxide
cells have been studied. The effect of temperature and Ni:Co ratio on
their phase composition, microstructure and electrochemical properties
are discussed. It was shown that oxygen electrodes infiltrated with LaNi0.5Co0.5O3-δ had the lowest polarization resistance, i.e. 67 mΩ cm2
at 600 °C. The performance of a fuel electrode supported solid oxide
cell with infiltrated oxygen electrode in both fuel cell and
electrolysis mode was tested. Electrochemical characterization of the
solid oxide cell showed that the resistance contribution from these
oxygen electrodes to the overall cell resistance is minor i.e.
approximately 20 mΩ cm2 at a temperature of 700 °C. The cell was also tested in the steam electrolysis mode at a constant current of −1.0 A cm−2 at 800 °C for 240 h. The oxygen electrode showed reasonable degradation rate with the oxygen electrode resistance of 33 mΩ cm2 at 700 °C after 240 h of testing.
Original language | English |
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Journal | Journal of Power Sources |
Volume | 353 |
Pages (from-to) | 67-76 |
ISSN | 0378-7753 |
DOIs | |
Publication status | Published - 2017 |
Keywords
- SOFC
- SOEC
- Infiltration
- Lanthanum nickelate
- Lanthanum cobaltite
- Oxygen electrode