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DS: Fachverband Dünne Schichten
DS 10: Transport Properties
DS 10.2: Vortrag
Donnerstag, 20. März 2025, 11:45–12:00, H14
Electrochemical characterization of CeO2/YSZ multilayer systems with well-defined interfaces — •Julius K. Dinter1, Anja Henß1,2, and Matthias T. Elm1,2 — 1ZfM, JLU Gießen — 2Institute of Experimental Physics, JLU Gießen
Mixed ionic and electronic conductors (MIECs) are key components for a variety of electrochemical devices. Their functionality depends on their ability to store or transport both electrons and ions. However, most materials with high ionic conductivity exhibit poor electronic conductivity and vice versa. A common approach to overcome this challenge is the preparation of artificial mixed conductors by mechanically mixing a good electronic conductor with an ionic conductor. Consequently, these artificial MIECs are characterized by a high number of interfaces, which can significantly affect charge storage and charge transport in the composites. A detailed understanding of the impact of these interfaces on the electrochemical properties is essential for the design and improvement of electrochemical devices with enhanced functionality. We present the preparation and characterization of multilayer heterostructures of ceria (CeO2) and yttria-stabilized zirconia (YSZ). The multilayers with constant thickness but varying number of interfaces were prepared by pulsed laser deposition to obtain thin film structures with well-defined interfaces. Structural characterization was performed using Raman microscopy and time-of-flight secondary ion mass spectrometry. The electrochemical properties were characterized by electrochemical impedance spectroscopy at different temperatures and under varying atmospheric conditions.
Keywords: Impedance Spectroscopy; Multilayers; Mixed ionic and electronic conductors