Journal article
Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells
Department of Energy Conversion and Storage, Technical University of Denmark1
Applied Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark2
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark3
Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark4
Two Solid Oxide Electrolysis Cells (SOECs) with different oxygen electrodes have been tested in galvanostatic tests carried out at −1.5 Acm−2 and 800 °C converting 60% of a 50:50% mixture of H2O and CO2 (co-electrolysis). One of the cells had an LSM:YSZ oxygen electrode. The other had an CGO inter-diffusion barrier sandwiched between the YSZ electrolyte and an LSCF:CGO oxygen electrode.
Impedance Spectroscopy was used during the tests to diagnose the change in electrochemical response of the different components of the SOECs. The results showed a significantly lower degradation rate for the cell with an LSCF:CGO oxygen electrode. This was attributed to three different effects: (1) The LSCF electrode was found to be more stable than its LSM:YSZ based counterpart. (2) The crack propagation in the YSZ electrolyte was less severe in the cell with an LSCF electrode. (3) The Ni:YSZ degradation was less severe in the cell with an LSCF electrode.
We hypothesize further that (2) is an effect of the CGO inter-diffusion layer and that (3) is an indirect effect of (2).
| Language: | English |
|---|---|
| Year: | 2013 |
| Pages: | 349-357 |
| ISSN: | 18732755 and 03787753 |
| Types: | Journal article |
| DOI: | 10.1016/j.jpowsour.2012.08.063 |
| ORCIDs: | Sun, Xiufu and Chen, Ming |
