Abstract
To design durable and reliable solid oxide fuel cells (SOFCs) for commercialization, we investigate the degradation behavior of yttria-stabilized zirconia-based anode-supported cells under two electrical load conditions – load trip (0.2–0 A · cm−2) and load cycle (0.20–0.12 A · cm−2) modes for 60 times (about 1,450 h). During the load trip condition, the operating voltage of the cell decreases by 86 mV through the 1,443 h operation (60 load trips) with the degradation ratio of 9.1% (59.5 μV · h−1 at 0.2 A · cm−2), while the cell voltage decreases with the different degradation ratios of 7.1% and 4.2% at 0.2 and 0.12 A · cm−2, respectively, during the 60 load cycles (49.4 μV · h−1 at 0.2 A · cm−2). A combination of electrochemical impedance spectroscopy and distribution function of relaxation times, thermochemical (Gibbs equilibrium calculations), and post-mortem analysis (field emission-scanning electron microscopy and electron probe micro-analysis with an energy dispersive X-ray spectroscopy) demonstrates the main degradation mechanism of SOFCs under dynamic electrical load conditions. Furthermore, an operation strategy to mitigate the performance degradation under dynamic electrical loads is proposed through the identification of weak points of SOFC components.
| Original language | English |
|---|---|
| Pages (from-to) | F728-F735 |
| Journal | Journal of the Electrochemical Society |
| Volume | 165 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2018 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Electrochemistry
- Materials Chemistry
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Degradation of anode-supported solid oxide fuel cells under load trip and cycle conditions and their degradation prevention operating logic. / Kim, You Dong; Lee, John In; Saqib, Muhammad; Park, Ka Young; Hong, Jongsup; Yoon, Kyung Joong; Lee, Insung; Park, Jun Young.
In: Journal of the Electrochemical Society, Vol. 165, No. 9, 01.01.2018, p. F728-F735.Research output: Contribution to journal › Article
TY - JOUR
T1 - Degradation of anode-supported solid oxide fuel cells under load trip and cycle conditions and their degradation prevention operating logic
AU - Kim, You Dong
AU - Lee, John In
AU - Saqib, Muhammad
AU - Park, Ka Young
AU - Hong, Jongsup
AU - Yoon, Kyung Joong
AU - Lee, Insung
AU - Park, Jun Young
PY - 2018/1/1
Y1 - 2018/1/1
N2 - To design durable and reliable solid oxide fuel cells (SOFCs) for commercialization, we investigate the degradation behavior of yttria-stabilized zirconia-based anode-supported cells under two electrical load conditions – load trip (0.2–0 A · cm−2) and load cycle (0.20–0.12 A · cm−2) modes for 60 times (about 1,450 h). During the load trip condition, the operating voltage of the cell decreases by 86 mV through the 1,443 h operation (60 load trips) with the degradation ratio of 9.1% (59.5 μV · h−1 at 0.2 A · cm−2), while the cell voltage decreases with the different degradation ratios of 7.1% and 4.2% at 0.2 and 0.12 A · cm−2, respectively, during the 60 load cycles (49.4 μV · h−1 at 0.2 A · cm−2). A combination of electrochemical impedance spectroscopy and distribution function of relaxation times, thermochemical (Gibbs equilibrium calculations), and post-mortem analysis (field emission-scanning electron microscopy and electron probe micro-analysis with an energy dispersive X-ray spectroscopy) demonstrates the main degradation mechanism of SOFCs under dynamic electrical load conditions. Furthermore, an operation strategy to mitigate the performance degradation under dynamic electrical loads is proposed through the identification of weak points of SOFC components.
AB - To design durable and reliable solid oxide fuel cells (SOFCs) for commercialization, we investigate the degradation behavior of yttria-stabilized zirconia-based anode-supported cells under two electrical load conditions – load trip (0.2–0 A · cm−2) and load cycle (0.20–0.12 A · cm−2) modes for 60 times (about 1,450 h). During the load trip condition, the operating voltage of the cell decreases by 86 mV through the 1,443 h operation (60 load trips) with the degradation ratio of 9.1% (59.5 μV · h−1 at 0.2 A · cm−2), while the cell voltage decreases with the different degradation ratios of 7.1% and 4.2% at 0.2 and 0.12 A · cm−2, respectively, during the 60 load cycles (49.4 μV · h−1 at 0.2 A · cm−2). A combination of electrochemical impedance spectroscopy and distribution function of relaxation times, thermochemical (Gibbs equilibrium calculations), and post-mortem analysis (field emission-scanning electron microscopy and electron probe micro-analysis with an energy dispersive X-ray spectroscopy) demonstrates the main degradation mechanism of SOFCs under dynamic electrical load conditions. Furthermore, an operation strategy to mitigate the performance degradation under dynamic electrical loads is proposed through the identification of weak points of SOFC components.
UR - http://www.scopus.com/inward/record.url?scp=85049318101&partnerID=8YFLogxK
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U2 - 10.1149/2.1391809jes
DO - 10.1149/2.1391809jes
M3 - Article
AN - SCOPUS:85049318101
VL - 165
SP - F728-F735
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 9
ER -