Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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

  1. Y. S. Lee and J. S. Lim, "Hydrogen Storage Technology by using Porous Carbon Materials", Journal of Korean Industrial and Engineering Chemistry, Vol. 20, No. 5, pp.465-472, 2009.
  2. Y. Mizutani et al., "Form Rare Earth Doped Zirconia to 1 KW Solid Oxide Fuel Cell System", Journal of Alloys Compounds, Vol. 518, No. 24, pp. 408-412, 2006.
  3. D. Silmbarasan, V. J. Surya, V. Vasu and K. Iyakutti, "Investigation of Single-walled Carbon Nanotubes Titanium metal composite as a possible hydrogen strorage medium", Internaional Journal of Hydrogen Energy, Vol. 38, pp. 14654-14660, 2013. https://doi.org/10.1016/j.ijhydene.2013.09.009
  4. J. S. Lim, J.H. Choi and O. J. Kwon, "Effect of Oxidation of Ni on the Microstructure of Ni/YSZ Anode and Crack Formation in YSZ Electrolyte Layer for SOFC", Journal of the Korean Ceramic Society, Vol. 43, No. 12, pp. 805-811, 2006. https://doi.org/10.4191/KCERS.2006.43.12.805
  5. J. H. Jun, Y. M. Park, S. C. Hwang, Y. W. Kim, D. H. Kim and J. H. Jun, "Review of Performance Degradation in Planar SOFCs", RIST Research Paper, Vol.24, No. 2, pp. 91-97, 2010.
  6. K. J. Park, S. O. Yu, J. M. Bae, H. S. Kim and Y. K. Ko, "Fast Performance Degradation of SOFC Caused by Cathode Delamination in Long-term Testing", International Journal of Hydrogen Energy, Vol. 35, pp. 8670-8677, 2010. https://doi.org/10.1016/j.ijhydene.2010.05.005
  7. Y. C. H and J. R. Selman, "The Degradation of SOFC Electrodes", Solid State Ionics, Vol. 98, pp. 33-38, 1997. https://doi.org/10.1016/S0167-2738(97)00106-9
  8. J. Malzbender, P. Batfalsky, R. Vaben, V.Shemet and F. Tietz, "Component Interactions after Long-term Operation of an SOFC Stack with LSM Cathode", Journal of Power Source, Vol. 201, pp.196-203, 2012. https://doi.org/10.1016/j.jpowsour.2011.10.117
  9. M. Mori, N. M. Sammes, E. Suda and Y. Takeda, "Application of $La_{0.6}AE_{0.4}MnO_3$(AE=Ca and Sr) to Electric Current Collectors in High-temperature Solid Oxide Fuel Cells", Solid State Ionics, Vol. 164, pp. 1-15, 2003. https://doi.org/10.1016/S0167-2738(03)00303-5
  10. Y. Guo, Y. Liu, R. Cai, D. Chen, R. Ran and Z. Shao, "Electrochemical Contribution of Silver Current Collector to Oxygen Reduction Reaction Over $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_3$- Electrode on Oxygen-ionic Conducting Electrolyte", International Journal of Hydrogen Energy, Vol. 37, pp. 14492-14500, 2012. https://doi.org/10.1016/j.ijhydene.2012.07.031
  11. M. Han, S. Peng, Z. Wang, Z. Yang and X. Chen, "Properties of Fe-Cr based Alloys as Interconnects in a Solid Oxide Fuel Cell", Journal of Power Source, Vol. 164, pp. 278-283, 2007. https://doi.org/10.1016/j.jpowsour.2006.10.039
  12. J. Wu, R. S. Gemmen, A. Manivannan and X. Liu, "Investigation of Mn/Co Coated T441 Alloy as SOFC Interconnect by On-cell Tests", International Journal of Hydrogen Energy, Vol. 36, pp. 4525-4529, 2011. https://doi.org/10.1016/j.ijhydene.2010.04.115
  13. N.W. Cho, S.C. Hwang, S.M. Han, E.S. Park, S.I. Chai, Y.W. Kim, J.H. Jun, S.G. Kim, S.T. Kuk, Y.J. Choi, D.H. Kim, J.H. Jun and B.H. Park, "Current Collecting Technology in Stacking the unit Cells of Planar Solide Oxide Fuel Cell", RIST Research Paper, Vol. 20, No. 2, pp. 181-186, 2006.
  14. J. H. Kang, K. M. Yu, K. W. Koo and S. O. Han, "Precision Measurement of Silicon Wafer Resistivity using Singleconfiguration Four-point Probe Method", Trans. KIEE, Vol. 60, No. 7, pp. 1434-1437, 2011.
  15. J. W. Kim, K. S. Kim, H. J. Lee, H. Y. Kim, Y. B. Park and S. M. Hyun, "Characterization and Observation of Cu-Cu Thermo-compression Bonding using 4-point Bending Test System, Vol. 18, No. 4, pp. 11-18, 2011.