Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells

Publication: Research - peer-reviewJournal article – Annual report year: 2013

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@article{c236a170f0ff4508838b07331f7821de,
title = "Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells",
publisher = "Elsevier S.A.",
author = "Per Hjalmarsson and Xiufu Sun and Yi-Lin Liu and Ming Chen",
year = "2013",
doi = "10.1016/j.jpowsour.2012.08.063",
volume = "223",
pages = "349--357",
journal = "Journal of Power Sources",
issn = "0378-7753",

}

RIS

TY - JOUR

T1 - Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells

A1 - Hjalmarsson,Per

A1 - Sun,Xiufu

A1 - Liu,Yi-Lin

A1 - Chen,Ming

AU - Hjalmarsson,Per

AU - Sun,Xiufu

AU - Liu,Yi-Lin

AU - Chen,Ming

PB - Elsevier S.A.

PY - 2013

Y1 - 2013

N2 - 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).

AB - 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).

KW - SOEC

KW - Solid oxide electrolysis cell

KW - Co-electrolysis

KW - Electrolysis

KW - Degradation

KW - MIEC

U2 - 10.1016/j.jpowsour.2012.08.063

DO - 10.1016/j.jpowsour.2012.08.063

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

VL - 223

SP - 349

EP - 357

ER -