Hostname: page-component-848d4c4894-mwx4w Total loading time: 0 Render date: 2024-07-01T13:30:44.710Z Has data issue: false hasContentIssue false
  • English
  • Français

Electrical Conductivity of Ionic and Electronic Mixture

Published online by Cambridge University Press:  17 March 2011

Gyeong Man Choi ,
Joon Hee Kim  and
Young Min Park
Gyeong Man Choi
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
Joon Hee Kim
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
Young Min Park
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
Get access

Abstract

Mixed ionic-electronic conductors (MIECs) which have both ionic and electronic species as charge carriers have a wide range of applications, such as electrodes in fuel cells, electrocatalytic reactors, and gas separating membranes. They may have either electronic or ionic species as the majority charge carriers. In addition to the single-phase mixed conductors, they may be fabricated by mixing two different phases of materials. Although these composites have been less studied than the single phase MIECs, the combined properties are often superior to single phase MIECs, and properties not seen in an individual phase may appear in the composite phase.

YSZ-based composite systems were chosen to test the effect of transition-metal-oxide (TMO) addition on the electronic conductivity of composite. To induce mixed conductivity, electronic-conducting TMOs such as NiO and Mn2O3 were added into YSZ above the solubility limit. While the solid solubility of NiO in YSZ is limited that of Mn2O3 is large.

In this work, mixed conducting yttria (8 mol%) stabilized zirconia (YSZ) - TMO composites were prepared in full composition range and the electrical conductivity of the composites was measured by 4-probe d.c. conductivity. Electromotive force (emf) measurements of the galvanic cell, current-voltage (I-V) measurements in ion blocking condition and the oxygen-partial-pressure dependent conductivity have been used to determine the contribution of the ionic and electronic charge carriers on the conductivity. Thus the composition-dependent electrical properties were used to explain the percolation behavior of electronic charge carriers in ionic matrix.

Although the total conductivity of dense YSZ-TMO composite was variable with TMO content, the partial-electronic conductivity increased and the ionic conductivity decreased. The composition-dependent conductivity was discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 699: Symposium R – Electrically Based Microstructural Characterization III , 2001 , R9.6
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Minh, N.Q. and Takahashi, T., Science and technology of ceramic fuel cells, Elsevier, New York, 1995 Google Scholar
2. Taimatsu, H., Wada, K., Kaneko, H., and Yamamura, H., J. Am. Ceram. Soc., 75, 401 (1992).Google Scholar
3. Kuscer, D., Holc, J., Hrovat, M., Bernik, S., Samardzija, Z., and Kolar, D., Sol. St. Ionics, 78, 79 (1995).Google Scholar
4. Kawata, T., Sakai, N., Yokokawa, H., Dokiya, M. and Anzai, I., Sol. St. Ionics, 50, 189 (1992).Google Scholar
5. Yokokawa, H., Sakai, N., Kawada, T., and Dokiya, M., Sol. St. Ionics, 40/41, 398 (1990).Google Scholar
6. Tuller, H. L., Sol. St. Ionics, 52, 135 (1992).Google Scholar
7. Adler, S. B., Lane, J.A., and Steele, B. C. H., J. Electrochem. Soc., 143, 3554 (1996).Google Scholar
8. Hayashi, K., Yamamoto, O., Nishigaki, Y., Minoura, H., Sol. St. Ionics, 98, 49 (1997).Google Scholar
9. Ostergard, M.J.L., Clausen, C., Bagger, C. and Mogensen, M., Electrochim. Acta, 40, 1971 (1995).Google Scholar
10. Matsui, N. and Takigawa, M., Sol. St. Ionics, 40–41, 926 (1990).Google Scholar
11. Gauckler, L.J. and Sasaki, K., Sol. St. Ionics 75, 203 (1995).Google Scholar
12. Tare, V.B., Mehrotra, G.M. and Wagner, J.B., 18-19, 747 (1986).Google Scholar
13. Wagner, J.B. and Wagner, C., J.Chem.Phys., 26, 1597 (1957)Google Scholar
14. Park, Y.M. and Choi, G.M., J.Electrochem., 146, 883 (1999).Google Scholar
15. Kim, J.H., Choi, G.M., Sol. St. Ionics, 130, 157 (2000).Google Scholar
16. Wu, Z., Liu, M., Sol. St. Ionics, 93, 65 (1997).Google Scholar
17. Han, D.G. and Choi, G.M., Sol.St.Ionics, 106, 71 (1998)Google Scholar