Conference paper · Journal article
Lessons learned from operating a solid oxide electrolysis cell at -1.25 a/cm2 for one year
Conventional Ni/yttria stabilized zirconia (YSZ) fuel electrode supported solid oxide electrolysis cells (SOECs) demonstrate acceptable long-term durability when operated at below -1 A/cm2. These cells suffer however severe degradation at above -1 A/cm2, where a large part of the cell resistance increase is associated with the Ni/YSZ electrode.
In this work, by introducing Ce0.8Gd0.2O2-δ (CGO) nanoparticles into the Ni/YSZ electrode, we reduce the cell degradation down to 39 mV/kh when operated at 810 °C and -1.25 A/cm2. A steam supply failure at 4000 h causes certain damage to the cell, resulting in higher degradation in the second half of the one-year period.
A degradation-mitigation strategy is successfully tried out by increasing the operating temperature to 836 °C eventually. The test is successfully terminated after reaching one year, demonstrating an average degradation rate of 39 mV/kh over the one-year period. The current work shows the potential of modifying conventional SOEC cells for use in high current density electrolysis applications.
Language: | English |
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Year: | 2021 |
Pages: | 475-486 |
Proceedings: | 17th International Symposium on Solid Oxide Fuel Cells |
ISSN: | 19386737 and 19385862 |
Types: | Conference paper and Journal article |
DOI: | 10.1149/10301.0475ecst |
ORCIDs: | Chen, M. , Tong, X. F. and Ovtar, S. |