Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Polarization Resistance of (Ba0.5Sr0.5)0.99Co0.8Fe0.2O3-δ Air Electrode Synthesized by Glycine-Nitrate Process

Glycine-Nitrate 법으로 제조한 (Ba0.5Sr0.5)0.99Co0.8Fe0.2O3-δ 공기극의 분극저항

  • Moon, Ji-Woong (Korea Institute of Ceramic Engineering and Technology) ;
  • Lim, Yong-Ho (Korea Institute of Ceramic Engineering and Technology, School of Materials Science and Engineering, Inha University) ;
  • Oh, You-Keun (Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Mi-Jai (Korea Institute of Ceramic Engineering and Technology) ;
  • Choi, Byung-Hyun (Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Hae-Jin (School of Materials Science and Engineering, Inha University)
  • 문지웅 (요업(세라믹)기술원) ;
  • 임용호 (요업(세라믹)기술원, 인하대학교 신소재공학부) ;
  • 오유근 (요업(세라믹)기술원) ;
  • 이미재 (요업(세라믹)기술원) ;
  • 최병현 (요업(세라믹)기술원) ;
  • 황해진 (인하대학교 신소재공학부)
  • Published : 2005.12.01
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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.

Keywords

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