Effect of Gd_(0.2)Ce_(0.8)O_2 Sintering Temperature on Formation of a SrZrO_3 blocking Layer between Y_(0.16)Zr_(0.84)O_2, Gd_(0.2)Ce_(0.8)O_2 and La_(0.58)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3

摘要

This study focuses on the microstructural characterization of LSCF(La_(0.58)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) )-GDC (Gd_(0.2)Ce_(0.8)O_(2-δ)) and GDCYDZ (8 mol% Y_2O_3-doped ZrO_2) 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°C) 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 SrZrO_3 (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.