Abstract

This study focuses on the microstructural characterization of LSCF(La0.58Sr0.4Co0.2Fe0.8O3-δ )-GDC (Gd0.2Ce0.8O2-δ) and GDC-YDZ (8 mol% Y2O3-doped ZrO2) interfaces in solid oxide fuel cells (SOFCs) using transmission electron microscopy (TEM). In particular, the influence of the GDC sintering temperature on microstructure evolution is studied. As a result, an interdiffusion layer between GDC and YDZ is observed. In case of lower GDC sintering temperatures (1100 ℃) the YDZ/GDC interface region consists of two different layers with distinct elemental composition. The layer adjoined to the GDC layer is rich in Sr and Zr, indicating SrZrO3 (SZO) formation; the layer adjoined to YDZ is rich in Gd. With higher GDC sintering temperature the Gd-rich layer increases in thickness, whereas SZO formation is reduced. In this case, only disconnected regions of SZO are formed.

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