Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Prediction of Mechanical and Electrical Properties of NiO-YSZ Anode Support for SOFC from Quantitative Analysis of Its Microstructure

미세조직 정량 분석을 통한 고체산화물연료전지용 NiO-YSZ 연료극 지지체의 기계적/전기적 성능 예측

  • 완디 와휴디 (한국에너지기술연구원 연료전지연구실) ;
  • 무하마드 샤질 칸 (한국에너지기술연구원 연료전지연구실) ;
  • 송락현 (한국에너지기술연구원 연료전지연구실) ;
  • 이종원 (한국에너지기술연구원 연료전지연구실) ;
  • 임탁형 (한국에너지기술연구원 연료전지연구실) ;
  • 박석주 (한국에너지기술연구원 연료전지연구실) ;
  • 이승복 (한국에너지기술연구원 연료전지연구실)
  • Received : 2017.09.08
  • Accepted : 2017.10.30
  • Published : 2017.10.30
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Abstract

Improving the microstructure of NiO/YSZ is one of several approaches used to enhance the electrical and mechanical properties of an anode support in Solid Oxide Fuel Cells (SOFCs). The aim of the work reported in this paper was to predict the relationship between these microstructural changes and the resulting properties. To this end, modification of the anode microstructure was carried out using different sizes of Poly (Methyl Methacrylate) (PMMA) beads as a pore former. The electrical conductivity and mechanical strength of these samples were measured using four-probe DC, and three-point bend-test methods, respectively. Thermal etching followed by high resolution SEM imaging was performed for sintered samples to distinguish between the three phases (NiO, YSZ, and pores). Recently developed image analysis techniques were modified and used to calculate the porosity and the contiguity of different phases of the anode support. Image analysis results were verified by comparison with the porosity values determined from mercury porosimetry measurements. Contiguity of the three phases was then compared with data from electrical and mechanical measurements. A linear relationship was obtained between the contiguity data determined from image analysis, and the electrical and mechanical properties found experimentally. Based upon these relationships we can predict the electrical and mechanical properties of SOFC support from the SEM images.

Keywords

References

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