Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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A Study on the High Temperature Steam Electrolysis Using (La0.8Sr0.2)0.95MnO3/Yttria Stabilized Zirconia Composite Electrodes

(La0.8Sr0.2)0.95MnO3/Yttria Stabilized Zirconia 복합체 전극을 이용한 고온 수증기 전기분해 연구

  • Ji, Jong-Sup (Department of Chemical Engineering, Chung-nam National University) ;
  • Kim, Chang-Hee (Hydrogen Production Research Center, Korea Institute Energy Research) ;
  • Kang, Yong (Department of Chemical Engineering, Chung-nam National University) ;
  • Sim, Kyu-Sung (Hydrogen Production Research Center, Korea Institute Energy Research)
  • 지종섭 (충남대학교 화학공학과) ;
  • 김창희 (한국에너지기술연구원 수소제조연구센터) ;
  • 강용 (충남대학교 화학공학과) ;
  • 심규성 (한국에너지기술연구원 수소제조연구센터)
  • Received : 2005.05.27
  • Accepted : 2005.09.27
  • Published : 2005.10.31
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Abstract

The $(La_{0.8}Sr_{0.2})_{0.95}MnO_3$/yttria-stabilized zirconia (LSM/YSZ) composites were investigated as anode materials for high temperature steam electrolysis using X-ray diffractometry, scanning electron microscopy, galvanodynamic and galvanostatic polarization method. For this purpose, the LSMperovskites were fabricated in powders by co-precipitation method and then were mixed with 8 mol% YSZ powders in different molar ratios. The LSM/YSZ composites were deposited on 8 mol% YSZ electrolyte disks by means of a screen printing method, followed by sintering at temperatures above $1,100^{\circ}C$. From the experimental results, it is concluded that the electrochemical properties of LSM and the LSM/YSZ composites are closely related to their microstructure and operating temperatures.

고온수증기 전기분해의 양극물질로 이용될 수 있는 $(La_{0.8}Sr_{0.2})_{0.95}MnO_3$/yttria-stabilized zirconia(LSM/YSZ) 복합체 전극을 x-ray diffractometry, scanning electron microscopy 그리고 galvanodynamic, galvanostatic polarization method로 연구하였다. 이런 목적으로 perovskite-type의 LSM 물질은 공침법을 이용하여 제조하였으며, 8 mol% YSZ와 몰분율을 달리하여 복합체 전극을 합성하였다. LSM/YSZ 복합체 전극은 평판의 YSZ 전해질에 LSM/YSZ 복합체를 스크린 프린팅 후 $1,100^{\circ}C$에서 열처리 코팅하여 제조하였다. 실험결과로부터 LSM/YSZ 복합체 전극의 전기화학적 특성은 전극을 이루는 삼상계면의 구조와 전기분해 온도에 영향을 받는다는 것을 확인하였다.

Keywords

Acknowledgement

Supported by : 과학기술부

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