Current Collector Effects on High Temperature Electrolysis by NI-YSZ Cermet Supported Solid Oxide Cells

집전체에 따른 NI-YSZ Cermet 기반의 가역적 고체산화물 연료전지를 이용한 고온 수증기 전기분해 특성

  • Shin, Eui-Chol (School of Materials Science and Engineering, Chonnam National University) ;
  • Ahn, Pyung-An (School of Materials Science and Engineering, Chonnam National University) ;
  • Seo, Hyun-Ho (School of Materials Science and Engineering, Chonnam National University) ;
  • Lee, Jong-Sook (School of Materials Science and Engineering, Chonnam National University) ;
  • Yu, Ji-Haeng (Korea Institute of Energy Research) ;
  • Woo, Sang-Kuk (Korea Institute of Energy Research)
  • 신의철 (전남대학교 신소재공학부) ;
  • 안평안 (전남대학교 신소재공학부) ;
  • 서현호 (전남대학교 신소재공학부) ;
  • 이종숙 (전남대학교 신소재공학부) ;
  • 유지행 (한국에너지기술연구원) ;
  • 우상국 (한국에너지기술연구원)
  • Received : 2010.10.13
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

Ni-YSZ supported button cells were prepared by spray-coating YSZ and screen-printing YSZ-LSM powder as an electrolyte and oxygen electrode on Ni-YSZ cermet disks. In order to identify the polarization loss mechanism in high temperature electrolysis current-voltage characteristics coupled with electrochemical impedance spectroscopy were investigated as a function of temperature, current load, and the humidity. The effects of the different current collectors of platinum and silver for oxygen electrodes were compared. With Ag current collector two polarization losses were distinguished. The high frequency component was attributed to the Ni-YSZ cermet which was less susceptible to temperature variation but increasing in loss with humidity. The lower frequency component was attributed to the LSM electrode. Platinum current collector led to a much lower polarization loss.

Keywords

HTE;Polarization loss;Current-voltage curve;Electrical impedance analysis;Ni-YSZ cermet;Current collector;Platinum;Silver

Acknowledgement

Grant : 고효율 수소 에너지 제조.저장.이용 기술 개발 사업

References

  1. H. S. Spacil, C. S. Tedmon, Jr., "Electrochemical Dissociation of Water Vapor in Solid Oxide Electrolyte Cells", J. Electrochem. Soc., Vol. 116, 1969, pp. 1618-1627. https://doi.org/10.1149/1.2411642
  2. S. P. Simner, M. D. Anderson, L. R. Pederson, and J. W. Stevenson, "Performance Variability of La(Sr)FeO3 SOFC Cathode with Pt, Ag, and Au Current Collectors", J. Electrochem. Soc., Vol. 161, pp. 115-122.
  3. S. Wang, T. Kato, S. Nagata, T. Honda, T. Kaneko, N. Iwashita, M. Dokiya, "Performance of a $La_{0.6}Sr_{0.4}Co_{0.8}Fe_{0.2}O_{3}$$Ce_{0.8}Gd_{0.2}O_{1.9}$–Ag cathode for ceria electrolyte SOFCs", Solid State Ionics, Vol. 146, pp. 203-210.
  4. V. A. C. Haanappel, D. Rutenbeck, A. Mai, S. Uhlenbruck, D. Sebold, H. Wesemeyer, B. Rowekamp, C. Tropartz and F. Tietz, "The influence of noble-metal-containing cathodes on the electrochemical performance of anode-supported SOFCs", J. Power sources, Vol. 130, 2004, pp. 119-128. https://doi.org/10.1016/j.jpowsour.2003.11.046
  5. J. H. Yu, H. L. Lee and S. K. Woo, "Anodesupported Solid Oxide Fuel Cells Prepared by spin-coating", J. Korean Ceramic Soc. Vol. 44, No. 12, 2007, pp. 733-739. https://doi.org/10.4191/KCERS.2007.44.1.733
  6. J. H. Yu, Y. W. Kim, S. W. Lee, D. W. Seo, K. S. Hong, I. S. Han and S.K. Woo, "Hydrogen production by the high temperature steam electrolysis of NiO/YSZ/Pt cell," Trans. of the Korean Hydrogen and New Energy Society, Vol. 17, No. 1, 2006, pp. 62-68.
  7. F. W. Poulsen, "Defect chemistry modelling of oxygen-stoichiometry, vacancy concentrations, and conductivity of $(La_{1-x}Sr_{x})_{y}MnO_{3{\pm}\delta}$", Solid State Ionics, Vol. 129, 2000, pp. 154-155.
  8. R. de L. Kronig, "On the theory of dispersion of X-rays", J. Opt. Soc. Am. Vol. 12, 1926, pp. 547-556. https://doi.org/10.1364/JOSA.12.000547
  9. B. A. Boukamp, "Practical application of the Kramers-Kronig transformation on impedance measurements in solid state electrochemistry", Solid State Ionics, Vol. 62, 1993, pp. 131-141. https://doi.org/10.1016/0167-2738(93)90261-Z