Choi, Sung Min Ahn, Junsung Son, Ji-Won Lee, Jong-Ho Kim, Byung-Kook Yoon, Kyung Joong Ji, Ho-Il 2024-01-19T21:30:42Z 2024-01-19T21:30:42Z 2021-09-05 2018-11-21 1944-8244 https://pubs.kist.re.kr/handle/201004/120669 Degradation of oxygen electrode in reversible solid oxide cells operating in both electrolysis and fuel-cell modes is a critical issue that should be tackled. However, origins and mechanisms thereof have been diversely suggested mainly due to the difficulty in precise analysis of microstructural/compositional changes of porous electrode, which is a typical form in solid oxide cells. In this study, we investigate the degradation phenomena of oxygen electrode under electrolysis and fuel-cell long-term operations for 540 h, respectively, using a geometrically welldefined, nanoscale La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) dense film with a thickness of similar to 70 nm. Based on assessments of electrochemical properties and analyses of microstructural and compositional changes after long-term operations, we suggest consolidated degradation mechanisms of oxygen electrode, including the phenomena of kinetic demixing/decomposition of LSCF, which is electrode. not readily observable in the typical porous-structured English American Chemical Society FUEL-CELLS DEGRADATION MECHANISM TRANSPORT LA0.6SR0.4CO0.2FE0.8O3-DELTA OPERATION Comprehensive Understanding of Cathodic and Anodic Polarization Effects on Stability of Nanoscale Oxygen Electrode for Reversible Solid Oxide Cells Article 10.1021/acsami.8b11874 1 ACS Applied Materials & Interfaces, v.10, no.46, pp.39608 - 39614 ACS Applied Materials & Interfaces 10 46 39608 39614 scie scopus 000451496000023 2-s2.0-85056526330 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article FUEL-CELLS DEGRADATION MECHANISM TRANSPORT LA0.6SR0.4CO0.2FE0.8O3-DELTA OPERATION reversible solid oxide fuel cells oxygen electrode polarization degradation thin-film electrode