Improved microstructure and sintering temperature of bismuth nano-doped GDC powders synthesized by direct sol-gel combustion |
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Authors: | G Accardo D Frattini HC Ham JH Han SP Yoon |
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Affiliation: | 1. Fuel Cell Research Center, KIST - Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea;2. Department of New Energy Engineering -Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, Republic of Korea;3. National Agenda Research Division, KIST - Korea Institute of Science and Technology, Republic of Korea |
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Abstract: | To improve the microstructural and electrochemical properties of Gadolinium-doped ceria (GDC) electrolytes, materials co-doped ceria with bismuth oxide (1–5 mol%) have been successfully prepared in a one-step sol-gel combustion synthetic route. Sol-gel combustion facilitates molecular mixing of the precursors and substitution of the large Bi3+ cations into the fluorite structure, considerably reducing the sintering temperature. Adding Bi2O3 as a dopant increases the GDC densification to above 99.7% and reduces its traditional sintering temperature by 300 °C. Impedance analyses show that the addition of bismuth enhances the conductivity (3.1?10?2?1.7?10?1 S·cm?1 in the temperature range 600–800 °C) and improves the performance of the solid electrolyte in intermediate-temperature solid oxide fuel cells. |
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Keywords: | Bismuth Ceramic Electrolyte Electrochemical Impedance Sintering Temperature Sintering Aids |
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