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Impact of GDC Interlayer Microstructure on Strontium Zirconate Interphase Formation and Cell Performance

Golani, Sadhana ORCID iD icon 1; Wankmüller, Florian 2; Herzhof, Werner; Dellen, Christian; Menzler, Norbert H.; Weber, André ORCID iD icon 1
1 Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1), Karlsruher Institut für Technologie (KIT)
2 Laboratorium für Elektronenmikroskopie (LEM), Karlsruher Institut für Technologie (KIT)

Abstract:

In solid oxide cells (SOCs) exhibiting mixed ionic-electronic conductor air electrode (MIEC AE) (e.g. La$_{0.6}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3–δ}$ LSC(F)), the formation of insulating zirconate interphases at the air electrode/zirconia electrolyte—interface is commonly prevented by an interlayer of doped cerium oxide. This complex interaction has a tremendous influence on cell performance, as the morphology of the interlayer determines the amount and continuity of the zirconate interphases. The performance of fuel electrode supported cells (FESCs) exhibiting gadolinium-doped ceria (GDC) interlayers fabricated from different commercially available powders are compared. All of these layers were fabricated according to the same procedure. The cell performance is analyzed by means of current-voltage (CV) characteristics, electrochemical impedance spectroscopy (EIS) and subsequent impedance analysis by the distribution of relaxation times (DRT). Next to the cell testing at application-oriented conditions, impedance spectra are measured over a wide temperature ranging down to 250 °C to resolve polarization phenomena related to bulk, grain boundary and interfacial effects within and in-between the gadolinium-doped ceria (GDC) and the 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163608
Veröffentlicht am 31.10.2023
Originalveröffentlichung
DOI: 10.1149/1945-7111/acfc2c
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST)
Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Institut für Angewandte Materialien (IAM)
Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2023
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000163608
Erschienen in Journal of The Electrochemical Society
Verlag Electrochemical Society
Band 170
Heft 10
Seiten Art.-Nr.: 104501
Vorab online veröffentlicht am 04.10.2023
Nachgewiesen in Scopus
Dimensions
Web of Science
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