Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Characterization of Gd1-xSrxMnO3 as Cathodic Material for Solid Oxide Fuel Cell

고체산화물 연료전지의 양극재료로서 Gd1-xSrxMnO3의 합성 및 특성평가

  • 윤희성 (고려대학교 재료공학부) ;
  • 최승우 (고려대학교 재료공학과) ;
  • 김병호 (고려대학교 재료공학과)
  • Published : 1999.02.01
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Abstract

Gd1-xSrxMnO3(0$\leq$X$\leq$0.6) as the cathode for solid oxide fuel cell was synthesized by citrate process and studied for its crystal structure, electrical conductivity, thermal expansion coefficient (TEC), and investigated reactivity with 8 mol% yttria stabilized zirconia(8YSZ) or Ce0.8Gd0.2O1.9 (CGO). The crystal structure of Gd1-xSrxMnO3 changed from orthorhombic (0$\leq$X$\leq$0.3) through cubic (0.4$\leq$X$\leq$0.5) to tetragonal structure (X=0.6). When Sr contents was increased, the electrical conductivity of Gd1-xSrxMnO3 was inthose of La1-xSrxMnO3, 8YSZ and CGO if Sr content was above 30mol%. TEC of Gd1-xSrxMnO3 was increased with Sr content. After heat treatment at 1300$^{\circ}C$ for 48 hours, reaction product of Gd1-xSrxMnO3 and 8YSZ was SrZrO3. However CGO had no reaction product with Gd1-xSrxMnO3.

고체산화물 연료전지의 양극재료로서 Gd1-xSrxMnO3을 구연산법으로 합성하였으며, 이의 결정구조, 전기전도도 및 열팽창률을 조사하였다. 또한 합성한 Gd1-xSrxMnO3을 8mol% yttria stabilized zirconia(8YSZ) 혹은 Ce0.8Gd0.2O1.9(CGO) 전해질과의 반응성을 조사하였다. Gd1-xSrxMnO3의 결정구조는 Sr함량이 증가함에 따라 orthorhombic (0$\leq$X$\leq$0.3)에서 cubic(0.4$\leq$X$\leq$0.5)을 거쳐 tetragonal (X=0.6)로 변하였다. Sr 함량이 증가함에 따라 Gd1-xSrxMnO3의 전기전도도는 증가하였다. 열팽창률은 Sr 함량이 30mol% 이상인 경우 함량이 증가함에 따라 증가하는 경향을 보이는 8YSZ, CGO와 비슷한 거동을 보였다. 8YSZ 및 CGO와의 반응성을 보기 위하여 Gd1-xSrxMnO3과 이들을 각각 혼합하여 130$0^{\circ}C$에서 48시간 동안 열처리했을 경우 8YSZ와는 SrZrO3의 반응물을 형성하였으나 CGO와는 반응을 하지 않았다.

Keywords

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