Publication date: 10th April 2024
Mixed ionic and electronic conductors (MIECs) are key components for a vast number of electrochemical devices, e.g. as intercalation electrodes, sensors or permeation membranes. The functionality of the components rely on the ability of the material either to store or to transport the neutral species, i.e. the electrons as well as the ions. However, most materials with a high ionic conductivity exhibits a poor electronic one and vice versa. A common approach of dealing with this challenge is the preparation of artificial mixed conductors by mechanical mixing of a good electronic conductor with an ion conductor to prepare transport pathways for both electrons and ions. Consequently, these artificial MIECs are characterized by a high number of interfaces, which may significantly affect charge storage and charge transport in the composites. A detailed understanding of the impact of the nanostructure and, in particular, electron-conducting/ion-conductor interface on charge transport and charge storage properties of the composites is essential for the design and the improvement of electrochemical devices with improved functionality. However, the number of systematic studies to address this question is still scarce. Motivated by recent results regarding the mixed-conducting properties of mesoporous CeO2/YSZ nanocomposites [1], we present the preparation and characterization of multilayer heterostructures formed by ceria (CeO2) and yttria-stabilized zirconia (YSZ). The multilayers were prepared by pulsed laser deposition to achieve thin film structures with well-defined interfaces. To identify the impact of the interfaces on charge transport, samples with constant thickness but varying number of interfaces were deposited. Structural characterization was performed using Raman microscopy, X-Ray diffraction analysis, scanning electron microscopy and time-of-flight secondary ion mass spectrometry. The electrochemical properties were characterized using electrochemical impedance spectroscopy at different temperatures and under varying atmospheric conditions.
J.K.D. and M.T.E. acknowledges financial support from the German Research Foundation (DFG, project numbers 512108624 & 498993886).
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