Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells
- Authors:
-
- Hjalmarsson, Per ;
-
Sun, Xiufu
;
Close
0000-0001-8503-9745
Department of Energy Conversion and Storage, Technical University of Denmark - Liu, Yi-Lin ;
-
Chen, Ming
Close0000-0001-6387-3739
Department of Energy Conversion and Storage, Technical University of Denmark
- DOI:
- 10.1016/j.jpowsour.2012.08.063
- Abstract:
- 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).
- Type:
- Journal article
- Language:
- English
- Published in:
- Journal of Power Sources, 2013, Vol 223, p. 349-357
- Keywords:
- SOEC; Solid oxide electrolysis cell; Co-electrolysis; Electrolysis; Degradation; MIEC
- Main Research Area:
- Science/technology
- Submission year:
- 2013
- ID:
- 232311777
