Abstract
Polarization losses associated with the cathode oxygen reduction reaction (ORR) and degradation of cathode materials remain as hurdles for widespread implementation of solid oxide fuel cells (SOFC). Rates of degradation depend significantly on the operating temperature and gas conditions, such as the presence of unwanted oxygen-containing compounds, namely H2O and CO2. In this study, we explore H2O and CO2 degradation mechanisms for a common composite cathode material, La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) - Ce0.90Gd0.10O1.95 (GDC) using electrochemical impedance spectroscopy (EIS) under various temperatures, oxygen partial pressure, and contaminant conditions to determine the effect of H2O and CO2 on LSCF-GDC. Our results suggest that CO2 and H2O compete with the ORR, and a strong correlation between blocking, degradation, and sintering effects caused by CO2 and H2O is directly observed. The interactions of CO2 and H2O with the cathode surface changes as a function of operating temperature, resulting in different short-term or long-term degradation mechanisms.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
