TY - JOUR
T1 - Experimental investigation of segmented SOECs
T2 - Locally-resolved impedance and degradation characteristics
AU - Königshofer, Benjamin
AU - Höber, Michael
AU - Menzler, Norbert H.
AU - Schröttner, Hartmuth
AU - Hochenauer, Christoph
AU - Subotić, Vanja
N1 - Funding Information:
The authors gratefully acknowledge the funding of the project “Degradation monitoring and performance optimisation of SOECs” (project number I 3994) by Austrian Science Fund (FWF). The cell manufacturing team at IEK-1 of Forschungszentrum Jülich is acknowledged for the cell fabrication.
Publisher Copyright:
© 2022 The Author(s)
PY - 2023/2/1
Y1 - 2023/2/1
N2 - High temperature solid oxide electrolysis cells (SOEC) provide an innovative solution for direct conversion of steam and electricity to hydrogen with the additional capability of adding CO2 to produce syngas. However, specific operating conditions can have a negative impact on the performance and lifetime of SOECs. In this context, the distributions of operational parameters such as gas species, temperature and current density within the cell structure influence local transport processes and reaction kinetics and can lead to locally different electrochemical potentials and thus degradation phenomena. This study focuses on experimental investigations of steam-electrode supported SOECs with segmented air electrodes with the main objective to measure EIS and thus identify locally-resolved impedance and degradation characteristics caused by different operating conditions in steam and co-electrolysis mode. Thereby, significant correlations between operating conditions, local effects, electrode processes and degradation mechanisms were observed and analyzed in detail using EIS, DRT and SEM.
AB - High temperature solid oxide electrolysis cells (SOEC) provide an innovative solution for direct conversion of steam and electricity to hydrogen with the additional capability of adding CO2 to produce syngas. However, specific operating conditions can have a negative impact on the performance and lifetime of SOECs. In this context, the distributions of operational parameters such as gas species, temperature and current density within the cell structure influence local transport processes and reaction kinetics and can lead to locally different electrochemical potentials and thus degradation phenomena. This study focuses on experimental investigations of steam-electrode supported SOECs with segmented air electrodes with the main objective to measure EIS and thus identify locally-resolved impedance and degradation characteristics caused by different operating conditions in steam and co-electrolysis mode. Thereby, significant correlations between operating conditions, local effects, electrode processes and degradation mechanisms were observed and analyzed in detail using EIS, DRT and SEM.
KW - Distribution of relaxation times (DRT)
KW - Electrochemical analysis
KW - Locally-resolved
KW - Segmented
KW - Solid oxide electrolysis cell (SOEC)
UR - http://www.scopus.com/inward/record.url?scp=85143070053&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2022.10.265
DO - 10.1016/j.ijhydene.2022.10.265
M3 - Article
AN - SCOPUS:85143070053
SN - 0360-3199
VL - 48
SP - 3740
EP - 3758
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 10
ER -
