Choi, Jin Hyeong Choi, Haneul Park, Jinhong Suh, Hoyoung Jeong, Young Woo Jung, WooChul Yoon, Kyung Joong Chang, Hye Jung 2025-12-26T09:00:19Z 2025-12-26T09:00:19Z 2025-10-30 2025-10-15 https://pubs.kist.re.kr/handle/201004/153876 Ensuring the long-term reliability of solid oxide electrolysis cells (SOECs) requires a deeper understanding of interfacial degradation mechanisms. This study employs in-situ transmission electron microscopy (TEM) to investigate structural and compositional changes at the interface between lanthanum strontium manganite (LSM) and yttria-stabilized zirconia (YSZ) under operating conditions. Using a symmetric LSM？YSZ？LSM configuration, we observed real-time degradation phenomena, including interfacial delamination, LSM poly-crystallization, and cation segregation, particularly under oxygen-deficient environments. These changes coincided with sharp increases in cell resistance and microstructural evolution. High-resolution TEM and energy-dispersive spectroscopy (EDS) revealed directional migration of Mn cations from the B-site of the perovskite lattice, suggesting oxygen vacancy formation plays a key role in destabilizing the structure. Our findings underscore the importance of stable oxygen ion transport in mitigating electrochemical degradation. This work highlights the utility of in-situ TEM in revealing degradation pathways and informing the development of more robust SOEC materials. Korean 한국세라믹학회 In-Situ TEM Analysis of Degradation Mechanisms in Solid Oxide Electrolysis Cells Under Oxygen Deficient Conditions Conference 2 2025 한국세라믹학회 추계학술대회 2025 한국세라믹학회 추계학술대회 KO COEX 2025-10-15 2025 한국세라믹학회 추계학술대회