Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Measurement of Partial Conductivity of 8YSZ by Hebb-Wagner Polarization Method

  • Lim, Dae-Kwang (Ionics Lab, School of Materials Science and Engineering Chonnam National University) ;
  • Guk, Jae-Geun (Ionics Lab, School of Materials Science and Engineering Chonnam National University) ;
  • Choi, Hyen-Seok (Ionics Lab, School of Materials Science and Engineering Chonnam National University) ;
  • Song, Sun-Ju (Ionics Lab, School of Materials Science and Engineering Chonnam National University)
  • Received : 2015.05.12
  • Accepted : 2015.06.01
  • Published : 2015.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The electrolyte is an important component in determining the performance of Fuel Cells. Especially, investigation of the conduction properties of electrolytes plays a key role in determining the performance of the electrolyte. The electrochemical properties of Yttrium stabilized zirconia (YSZ) were measured to allow the use of this material as an electrolyte for solid oxide fuel cells (SOFC) in the temperature range of $700-1000^{\circ}C$ and in $0.21{\leq}pO_2/atm{\leq}10^{-23}$. A Hebb-Wagner polarization experimental cell was optimally manufactured; here we discuss typical problems associated with making cells. The partial conductivities due to electrons and holes for 8YSZ, which is known as a superior oxygen conductor, were obtained using I-V characteristics based on the Hebb-Wagner polarization method. Activation energies for holes and electrons are $3.99{\pm}0.17eV$ and $1.70{\pm}0.06eV$ respectively. Further, we calculated the oxygen ion conductivity with electron, hole, and total conductivity, which was obtained by DC four probe conductivity measurements. The oxygen ion conductivity was dependent on the temperature; the activation energy was $0.80{\pm}0.10eV$. The electrolyte domain was determined from the top limit, bottom limit, and boundary (p=n) of the oxygen partial pressure. As a result, the electrolyte domain was widely presented in an extensive range of oxygen partial pressures and temperatures.

Keywords

References

  1. C. Song, L. Zhang, J. Zhang, D. P. Wilkinson, and R. Baker, "Temperature Dependence of Oxygen Reduction Catalyzed by Cobalt Fluorophthalocyanine Adsorbed on a Graphite Electrode," Fuel Cells, 7 9-15 (2007). https://doi.org/10.1002/fuce.200500205
  2. R. Noyes, Energy Technology Review; Vol. 1, pp. 1-32, Noyes Data Corporation, New Jersey, 1977.
  3. S. Sengodan, S. Choi, A. Jun, T. H. Shin, Y. W. Ju, H. Y. Jeong, J. Y. Shin, J. T. S. Irvine, and G. T. Kim, "Layered Oxygen-deficient Double Perovskite as an Efficient and Stable Anode for Direct Hydrocarbon Solid Oxide Fuel Cells," Nat. Mater., 14 205-9 (2015). https://doi.org/10.1038/nmat4166
  4. A. Trovarelli, "Catalytic Properties of Ceria and $CeO_2$-Containing Materials," Catal. Rev. Sci. Eng., 38 [4] 439-520 (1996). https://doi.org/10.1080/01614949608006464
  5. B. C. H. Steel, "Appraisal of $Ce_{1−y}Gd_yO_{2−y/2}$ Electrolytes for IT-SOFC Operation at $500^{\circ}C$," Solid State Ionics, 129 95-110 (2000). https://doi.org/10.1016/S0167-2738(99)00319-7
  6. M. H. Hebb, "Electrical Conductivity of Silver Sulfide," J. Chem. Phys., 20 185-90 (1952). https://doi.org/10.1063/1.1700165
  7. J. H. Kim and H. I. Yoo, "Partial Electronic Conductivity and Electrolytic Domain of $La_{0.9}Sr_{0.1}Ga_{0.8}Mg_{0.2}O_{3−{\delta}}$," Solid State Ionics, 140 105-13 (2001). https://doi.org/10.1016/S0167-2738(01)00687-7
  8. J. H. Park and R. N. Blumenthal, "Electronic Transport in 8 Mole Percent $Y_2O_3-ZrO_2$," J. Electrochem. Soc., 136 [10] 2867-76 (1989). https://doi.org/10.1149/1.2096302