Publication date: 10th April 2024
One of the critical degradation issues in Solid Oxide Fuel Cells (SOFCs) is the poisoning by impurities at cathodes [1,2]. The mechanisms of impurity poisoning, especially by Cr and S are reviewed and discussed based on our experimental results as well as literature data. For precise analyses of mass transports at (La,Sr)(Co,Fe)O3/(Gd,Ce)O2/(Y,Zr)O2 interfaces, the microstructures and elemental distributions of elements are examined as well as 18O isotopic oxygen exchange trace diffusion profiles. The motion of Sr in (La,Sr)(Co,Fe)O3 strongly affected the surface oxygen exchange reaction rates by the Sr-segregation at the surface and formed SrCrO4 and SrSO4. The difference between Cr and S poisoning is also discussed given chemical reactivities and resulting chemical compounds as well as electrochemical-induced effects. During the poisoning, rearrangement of phase composition may occur at the reaction products, leading to the formation of Sr-segregated phase, and perovskite phases. Also, some SrCrO4 and SrSO4 phases may evaporate by the existence of water vapors. This rearrangement of phases and side reactions may cause positive effects by eliminating the reaction products and forming 214/113 phase interfaces, where the cathodic reaction can be active. Such recovery reaction from the poisoning is supported by several poisoning experimental results.
The presentation will be made on the overview of such poisoning reactions and recovery reactions given mass transport at the cathode in SOFCs. As shown in Figure, the mass transports and diffusion of elements are discussed.
The author is grateful for the financial support from the NEDO (JPJN20003).
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