Preparation and characterization of 10 mol% Gd doped CeO2 (GDC) electrolyte for SOFC applications |
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Authors: | Aliye Arabacı M Faruk Öksüzömer |
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Affiliation: | 1. Istanbul University, Faculty of Engineering, Department of Metallurgical Engineering, Avcilar, 34320 Istanbul, Turkey;2. Istanbul University, Faculty of Engineering, Department of Chemical Engineering, Avcilar, 34320 Istanbul, Turkey |
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Abstract: | Ceria-based materials are prospective electrolytes for low and intermediate temperature solid oxide fuel cells. In the present work, fully dense CeO2 ceramics doped with 10 mol% gadolinium (Gd0.1Ce0.9O1.95, GDC) have been prepared with a Pechini method. Characterization studies were realized with thermo-gravimetric analysis (TGA), differential thermal analysis (DTA), mass spectroscopy (MS), high temperature FT-IR (HT-FTIR) and X-ray diffraction analysis (XRD). A single-phase with a fluorite type structure was found to form at a relatively low calcination temperature of 500 °C. Dense GDC pellets having 98% of the relative density were obtained at sintering temperature of 1400 °C/6 h, which gave significantly higher total ionic conductivity of 3.4×10−2 S cm−1 at 500 °C in air. The present work showed that the Pechini method is a relatively low-temperature preparation technique to synthesize Gd0.1Ce0.9O1.95 powders that provided high sinterability and good ionic conductivity. |
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Keywords: | CeO2 Gd0 1Ce0 9O1 95 Ionic conductivity Pechini method |
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