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 |
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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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