| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 102 === The Pr, Gd co-doped CeO2 powders with the chemical formula Ce0.8Gd0.2-XPrXO2 (X=0.01-0.05) were prepared by Pechini method and used as electrolyte material for intermediate temperature solid oxide fuel cell (ITSOFC). The XRD results showed that Pr, Gd co-doped CeO2 calcined at 700℃ had pure fluorite structure and slightly larger lattice parameters than Gd-doped CeO2 (Ce0.8Gd0.2O2-δ). The particle sizes calculated by Scherrer equation were in good agreement with those obtained from TEM images. The oxide ion conductivities of the co-doped materials were found to be directly proportional to the ratios of oxygen vacancies/lattice oxygen determined by the area ratios of O 1s XPS spectra. Among these co-doped materials, Ce0.8Gd0.18Pr0.02O2 gave the highest oxide ion conductivity (6.15 S/m at 700℃). The anode-supported single cell, fabricated by a simple co-pressing method using Ce0.8Gd0.18Pr0.02O2 of thickness of 20 μm as the electrolyte, La0.6Sr0.4Co0.2Fe0.8 as cathode, and 60%NiO-40%Ce0.8Gd0.2O2-δ as anode, gave a high power density of 0.739 W/cm2 and OCV of 0.82 V at 700℃ using 160 mL/min hydrogen as the fuel and 160 mL/min oxygen as the oxidant, and the single cell gave higher power density than that withCe0.8Gd0.2O2-δ as the electrolyte.
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