Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Porosity Control in LSM Electrode Formation in Layered Plannar SOFC Module

적층 평판형 SOFC에서 LSM 전극의 기공 제어

  • Lee, Won-Jun (Department of Materials Engineering, Inha University) ;
  • Yeo, Dong-Hun (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Team) ;
  • Shin, Hyo-Soon (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Team) ;
  • Jeong, Dea-Yong (Department of Materials Engineering, Inha University)
  • 이원준 (인하대학교 신소재공학부) ;
  • 여동훈 (한국세라믹기술원 엔지니어링세라믹팀) ;
  • 신효순 (한국세라믹기술원 엔지니어링세라믹팀) ;
  • 정대용 (인하대학교 신소재공학부)
  • Received : 2014.11.10
  • Accepted : 2014.11.21
  • Published : 2014.12.01
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Abstract

In solid oxide fuel cell system, yttria-stabilized zirconia is generally adopted as the electrolyte, which has high strength and superior oxygen ion conductivity, and the air electrode and the fuel electrode are attached to this. Recently, new structure of 'layered planar SOFC module' was suggested to solve the reliability problem due to the high temperature stability of a sealing agent and a binding material. In this study to materialize the air electrode in a layered planar SOFC module, the LSM ink was coated to form homogeneous electrode in the channel after the ink preparation. As the porosity control agent, PMMA or active carbon powder was adopted with use of a commercial dispersant in ethanol. The optimal amounts of both the porosity control agents and the dispersant were determined. Four (4) vol% of the dispersant for the LSM-PMMA case and 15 vol% for LSM-carbon powder showed the lowest viscosities respectively to indicate the best dispersed states of the slurries. With PMMA and carbon powder, sintered LSM ink shows the relatively homogeneous distributions of pores and with increases of the agents, the porosities increased in both cases. From this, it can be thought that the amount of the PMMA or carbon powder could be used to control the porosity of the LSM ink.

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