TY - JOUR
T1 - Accelerated degradation for solid oxide electrolysers
T2 - Analysis and prediction of performance for varying operating environments
AU - Königshofer, Benjamin
AU - Höber, Michael
AU - Nusev, Gjorgji
AU - Boškoski, Pavle
AU - Hochenauer, Christoph
AU - Subotić, Vanja
N1 - Publisher Copyright:
© 2022 The Authors
PY - 2022/3/1
Y1 - 2022/3/1
N2 - Solid oxide electrolysis cells (SOECs) are an efficient technology for the production of green hydrogen, that has great potential to contribute to the energy transition and decarbonization of industry. To date, however, time- and resource-intensive experimental campaigns slow down the development and market penetration of the technology. In order to speed-up the evaluation of SOEC performance and durability, accelerated testing protocols are required. This work provides the results of experimental studies on the performance of a SOEC stack operated under accelerated degradation conditions. In order to initiate and accelerate degradation, experiments were performed with high steam partial pressures at the gas inlet, higher voltages and lower temperatures and high steam conversion rates. Thereby, different types and degrees of impact on performance were observed, which were analyzed in detail and linked to the underlying processes and degradation mechanisms. In this context, significantly higher degradation rates were found compared to operation under moderate operating conditions, with the different operating strategies varying in their degradation acceleration potential. The results also suggest that a few hundred hours of operation may be sufficient to predict long-term performance, with the proposed operating strategies providing a solid basis for accelerated assessment of SOEC performance evolution and lifetime.
AB - Solid oxide electrolysis cells (SOECs) are an efficient technology for the production of green hydrogen, that has great potential to contribute to the energy transition and decarbonization of industry. To date, however, time- and resource-intensive experimental campaigns slow down the development and market penetration of the technology. In order to speed-up the evaluation of SOEC performance and durability, accelerated testing protocols are required. This work provides the results of experimental studies on the performance of a SOEC stack operated under accelerated degradation conditions. In order to initiate and accelerate degradation, experiments were performed with high steam partial pressures at the gas inlet, higher voltages and lower temperatures and high steam conversion rates. Thereby, different types and degrees of impact on performance were observed, which were analyzed in detail and linked to the underlying processes and degradation mechanisms. In this context, significantly higher degradation rates were found compared to operation under moderate operating conditions, with the different operating strategies varying in their degradation acceleration potential. The results also suggest that a few hundred hours of operation may be sufficient to predict long-term performance, with the proposed operating strategies providing a solid basis for accelerated assessment of SOEC performance evolution and lifetime.
KW - Accelerated degradation
KW - Distribution of relaxation times (DRT)
KW - Electrochemical analysis
KW - Solid oxide electrolysis cell (SOEC)
KW - Stack
UR - http://www.scopus.com/inward/record.url?scp=85123367400&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2022.230982
DO - 10.1016/j.jpowsour.2022.230982
M3 - Article
AN - SCOPUS:85123367400
SN - 0378-7753
VL - 523
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 230982
ER -