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Evaluation of the Effect of High Temperature on the Interface Characteristics between Solid Oxide Fuel Cell and Ag Paste

고온열처리가 고체산화물연료전지의 전극과 Ag 페이스트의 계면에 미치는 특성 평가

  • Jeon, Sang Koo (Department of Safety Engineering, Pukyong National University) ;
  • Nahm, Seung Hoon (Center for Energy Materials Metrology, Korea Research Institute of Standards and Science) ;
  • Kwon, Oh Heon (Department of Safety Engineering, Pukyong National University)
  • 전상구 (부경대학교 안전공학과) ;
  • 남승훈 (한국표준과학연구원 에너지소재표준센터) ;
  • 권오헌 (부경대학교 안전공학과)
  • Received : 2015.01.19
  • Accepted : 2015.02.11
  • Published : 2015.02.28

Abstract

In this study, interfacial characteristics between SOFC and Ag paste as current collector was estimated in the high temperature environment. The Ag paste was used to connect the unit cell of SOFC strongly with interconnector and provide the electrical conductivity between them. To confirm electrical conductivity, Ag paste was treated in the furnace at $800^{\circ}C$ for 48 hours. The sheet resistance of Ag paste was measured to compare the resistance values before and after the heat treatment. Also, the four-point bending test was performed to measure the interfacial adhesion. The unit cell of SOFC and $SiO_2$ wafer were diced and then attached by Ag paste. The $SiO_2$ wafer had the center notch to initiate a crack from the tip of the notch. The modified stereomicroscope combined with the CCD camera and system for measuring the length was used to observe the fracture behavior. To compare the characteristics before heat treatment and after heat treatment, the specimen was exposed in the furnace at $800^{\circ}C$ for 48 hours and then the interfacial adhesion was evaluated. Finally, the interfacial adhesion energy quantitatively increases $1.78{\pm}0.07J/m^2$ to $4.9{\pm}0.87J/m^2$ between the cathode and Ag paste and also increase $2.9{\pm}0.47J/m^2$ to $5.12{\pm}1.01J/m^2$ between the anode and Ag paste through the high temperature. Therefore, it is expected that Ag paste as current collector was appropriate for improving the structural stability in the stacked SOFC system if the electrical conductivity was more increased.

Keywords

References

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