Understanding (La,Sr)(Co,Fe)O 3−δ Phase Instability within SOECs Using a Combined Experimental and Atomistic Modeling Approach
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Le résumé fourni par la source
High Resolution Image Download MS PowerPoint Slide Understanding the onset of degradation in the air electrode within solid oxide electrolysis cells (SOECs), and the subsequent impact on cell performance, is a critical step in mitigating the performance losses and stability issues of SOECs. In an effort to identify early onset degradation phenomena, SOECs were characterized as fabricated and after testing potentiostatically at 1.3 V for 1000 h at 750 °C. SOEC air electrodes composed of a 1:1 composite of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (6428-LSCF) and Gd 0.1 Ce 0.9 O 1.95 (GDC) were studied using synchrotron X-ray diffraction (XRD), scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy (STEM-EDS), and X-ray absorption near-edge spectroscopy (XANES) to evaluate the changes in the air electrode structurally and chemically. These techniques show the migration of Sr species from the air electrode through pores in the GDC barrier layer, progressing to the electrolyte boundary, where it accumulates and reacts with (Zr 0.84 Y 0.16 )O 2−δ (YSZ) to form SrZrO 3 . Microscopy results are paired with atomistic simulations to better understand the relationship between the thermodynamic instability of 6428-LSCF and cell fabrication/testing conditions. First-principles calculations reveal that LSCF-6428 is not stable during cell manufacturing and testing conditions, which supports the experimental identification of secondary phases in both as-fabricated and tested cells. Together, these results demonstrate that the challenging environments encountered by SOECs during cell manufacturing and operation lead to instabilities of the target 6428-LSCF anode material and underscore the need for more durable, high-performing SOEC components.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Understanding (La,Sr)(Co,Fe)O <sub>3−δ</sub> Phase Instability within SOECs Using a Combined Experimental and Atomistic Modeling Approach
- Date Crossref
- 10/01/2025
- Éditeur
- American Chemical Society (ACS)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
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National Laboratory of the Rockies pays non établi dans la noticeStructure de recherche
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Colorado School of Mines pays non établi dans la noticeUniversité ou école supérieure
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Lawrence Livermore National Laboratory pays non établi dans la noticeStructure de recherche
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SLAC National Accelerator Laboratory Stanford Synchrotron Radiation Lightsource pays non établi dans la noticeStructure de recherche
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Stanford Synchrotron Radiation Lightsource pays non établi dans la noticeStructure de recherche
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Idaho National Laboratory pays non établi dans la noticeStructure de recherche
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National Renewable Energy Laboratory pays non établi dans la noticeStructure de recherche
National Laboratory of the Rockies, Colorado School of Mines et Lawrence Livermore National Laboratory, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.