Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy
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A. Soldati
Abstract
The Focused Ion Beam (FIB) technique was used to prepare site-specific samples from interfacial regions of different solid oxide fuel cells assemblies. Transmission and Scanning Electron Microscopy on the FIB foils combined with Electrochemical Impedance Spectroscopy (EIS) allowed the characterization of the electrode/electrolyte interphases and the determination of its influence on the cell performance after long-term operation conditions. This work reviews two cases: on one hand, Ln2NiO4+d (Ln= La, Nd) cathodes deposited on both Y0.08Zr0.92O1.96 and Ce0.9Gd0.1O1.95 electrolytes, that react at 900 °C during the adhesion treatment and at temperatures higher than 650 °C during the EIS measurements. These samples present a reaction layer of 10 nm thickness, which contains elements of both phases and was found responsible of the cell performance degradation. On the other hand, La0.4Sr0.6Co0.8Fe0.2O3-δ cathodes showed excelent performance on Ceria electrolytes, even after 1 000 h at operation conditions. In that case, the microscopic analyses of FIB foils showed a semi-coherent interphase growth.
Kurzfassung
Die FIB-Technik (Focused Ion Beam; Ionenfeinstrahltechnik) wurde zur Präparation ortsspezifischer Proben von Grenzflächen verschiedener Festoxid-Brennstoffzellen-Aggregate verwendet. Transmissions- und rasterelektronenmikroskopische Untersuchungen der FIB-Folien in Verbindung mit elektrochemischer Impedanz-Spektroskopie (EIS) ermöglichten die Charakterisierung der Elektroden/Elektrolyt-Interphasen und die Bestimmung ihrer Einflüsse auf die Leistung der Zelle nach Langzeitbetrieb. Diese Arbeit bewertet zwei Fälle: Auf der einen Seite Ln2NiO4+d (Ln = La, Nd) Kathoden an sowohl Y0.08Zr0.92O1.96 als auch Ce0.9Gd0.1O1.95 Elektrolyten, die während der Verklebung bei 900 °C und während der EIS-Messung bei Temperaturen über 650 °C reagieren. Diese Proben weisen eine 10 nm dicke Reaktionsschicht auf, die Elemente beider Phasen enthält und für den Leistungsabfall der Zellen verantwortlich gemacht wird. Auf der anderen Seite zeigten La0.4Sr0.6Co0.8Fe0.2O3-δ Kathoden an Ceroxid-Elektrolyten ausgezeichnete Leistung, auch nach 1 000 h Betriebsdauer. In diesem Fall konnte in der mikroskopischen Analyse der FIB-Folien ein semi-kohärentes Interphasenwachstum nachgewiesen werden.
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© 2014, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Assessing the Power of Electron Back Scattering Diffraction Characterization of Deformed F-138 Steel from the View Point of Crystal Diffraction
- Typical Zirconium Alloys Microstructures in Nuclear Components
- Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy
- Microscopic Investigation of Pitting Corrosion in Plasma Nitrided Austenitic Stainless Steel
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Assessing the Power of Electron Back Scattering Diffraction Characterization of Deformed F-138 Steel from the View Point of Crystal Diffraction
- Typical Zirconium Alloys Microstructures in Nuclear Components
- Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy
- Microscopic Investigation of Pitting Corrosion in Plasma Nitrided Austenitic Stainless Steel
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
