Abstract
Ce0.9Gd0.1O1.95 (CGO) and Zr0.79Sc0.2Ce0.01O1.9 (ScSZ) have been proposed as possible alternative electrolytes in intermediatetemperature solid oxide fuel cells (SOFCs). In this study, the mechanisms of densely sintering Co-doped CGO and ScSZ electrolytes during the SOFC fabrication process were investigated using synchrotron X-ray diffraction (SR-XRD) analysis. The addition of CoO enhanced the sintering characteristics of both CGO and ScSZ. Based on the results of SR-XRD analysis, it was found that CGO and CoO did not form a solid solution after heat treatment at 1100{degree sign}C for 10 h. On the other hand, the solubility limit of Co in ScSZ was estimated to be {less than or equal to} 3 mol % after firing at 1200{degree sign}C, and Co-doping accelerated the conversion of the two phases of the fluorite structure into a single cubic phase. The diffusion of Co into ScSZ is thought to assist the densification through reaction sintering.
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