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J. Korean Ceram. Soc. > Volume 42(12); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(12): 800.
doi: https://doi.org/10.4191/kcers.2005.42.12.800
Glycine-Nitrate 법으로 제조한 (Ba0.5Sr0.5)0.99Co0.8Fe0.2O3-δ 공기극의 분극저항
문지웅, 임용호1, 오유근, 이미재, 최병현, 황해진2
요업(세라믹)기술원
1요업(세라믹)기술원, 인하대학교 신소재공학부
2인하대학교 신소재공학부
Polarization Resistance of (Ba0.5Sr0.5)0.99Co0.8Fe0.2O3-δ Air Electrode Synthesized by Glycine-Nitrate Process
Ji-Woong Moon, Yong-Ho Lim1, You-Keun Oh, Mi-Jai Lee, Byung-Hyun Choi, Hae-Jin Hwang2
Korea Institute of Ceramic Engineering and Technology
1Korea Institute of Ceramic Engineering and Technology, School of Materials Science and Engineering, Inha University
2School of Materials Science and Engineering, Inha University
ABSTRACT
Cathode material, $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-delta}$, for low temperature SOFC was prepared by the Glycine-Nitrate synthesis Process (GNP). Characteristics of the synthesized powders were studied with controlling the pH of a precursor solution. Highly acidic precursor solution increased a perovskite forming temperature. It is considered that Ba and Sr cannot complex by carboxylic acid group of glycine, because under highly acidic condition the caboxylic group mainly combined with H+ insead of alkaline earth cations. A lack of bond between cations and glycine resulted in selective precipitation of the elements during evaporation of the precursor solution. In case of using precursor solution with pH %2~3$, a single perovskite phase was obtained at $1000^{circ}C$. Polarization resistance of $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-delta}$ was measured by AC impedance spectroscopy from the two electrode symmetric cell. Area specific resistance of the $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-delta}$ air electrode at $500^{circ}C;and;600^{circ}C$ were $0.96{Omega}{cdot}cm^2;and;0.16{Omega}{cdot}cm^2$, respectively.
Key words: SOFC, BSCF, Glycine-Nitrate process, Cathode, Polarization
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