Publication date: 10th April 2024
In this presentation, we will discuss La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) – Ce0.9Gd0.1O2 (GDC) oxygen electrode stability during 100 to 12,000 hours solid oxide electrolysis cell (SOEC) operation. A systematic study was undertaken to understand potential phase evolution of LSCF in a broad range of experimental conditions, while varying sintering and operating temperatures, operating pressure, current, voltage as well as during dynamic SOEC operation and in the presence of Cr and S contaminants. Tests were performed using standard Ni-YSZ electrode-supported SOECs with a thin YSZ electrolyte. Sr reactivity with the YSZ was assessed using dense and porous GDC barriers of various thicknesses fabricated by different techniques such as screen printing, PVD, PLD, and electron beam. The cells were either operated in a potentiostatic/galvanostatic mode or held at an open-circuit voltage (OCV) to separate effects of electrochemical aging from thermal aging. Multiple repeats were used to eliminate the occasional artifacts and atypical trends. In each test, electrochemical characteristics (current and voltage) were measured continuously over time, and the ohmic and polarization resistances were obtained periodically using electrochemical impedance spectroscopy and DRT. Following each test termination, extensive LSCF-GDC post-test characterization was carried out using SEM/EDS and STEM. Advanced machine learning tools were applied to provide the quantitative estimation of the particle/pore sizes and electrode microstructure variation under different operating conditions.
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