Skip to content

Research at St Andrews

The Effects of Alumina Additions upon the Electrical Properties of 8 mol% Yttria-Stabilised Zirconia

Research output: Contribution to journalArticle

Author(s)

School/Research organisations

Abstract

Solid oxide fuel cells (SOFCs) are energy converters that directly transform the chemical energy of combustible gases into electrochemical energy by oxidation. The design of SOFC, which has the highest volumetric power density, is a planar one in which the electrolyte, yttria-stabilised zirconia (YSZ), can be optimised by strengthening with small additions of alpha-Al3O3. Different commercial powders have different impurity contents and thus show different changes in ionic conductivity when alpha-Al2O3 is added. We describe the changes in oxide ion conductivity of Tosoh 8 mol.% YSZ that has been added to with a-alumina. AC impedance measurements show that small additions (similar to 1 wt.%) of Al2O3 can cause the ionic conductivity of Tosoh 8YSZ to increase due to a decrease in the grain boundary impedance which is observable at low to medium temperatures. Small wt.% additions of alpha-Al2O3 also cause an overall decrease in the high temperature impedance of 8YSZ. We have found that 10 wt.% alumina can be added to 8YSZ without any significant decrease in ionic conducting properties. Further additions of alumina cause a rapid decrease in conductivity due to the large volume percent of insulating alumina phases, which are present, and also due to the cracking of pellets that occurs on firing. We also report the improved stability of added-alumina 8YSZ to hydrothermal ageing. Hydrothermal ageing of unadded to 8YSZ, in an autoclave at 180 degrees C, can lead to a decrease in the conductivity at 1000 degrees C by as much as 40%. The drop in conductivity of 8YSZ can be limited to a decrease of only 10% by the addition of greater than 5 wt.% Al2O3. (C) 1999 Elsevier Science B.V. All rights reserved.

Close

Details

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalSolid State Ionics
Volume121
Publication statusPublished - Jun 1999

    Research areas

  • alumina addition, yttria-stabilized zirconia, conductivity, hydrothermal ageing, stability, OXIDE FUEL-CELLS, SOLID-ELECTROLYTE, CONDUCTIVITY, PHASE

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Lattice strain-enhanced exsolution of nanoparticles in thin films

    Han, H., Park, J., Nam, S. Y., Choi, G. M., Parkin, S. S. P., Jang, H. M. & Irvine, J. T. S., 1 Apr 2019, In : Nature Communications. 10, 8 p., 1471.

    Research output: Contribution to journalArticle

  2. Oxygen storage capacity and thermal stability of brownmillerite-type Ca2(Al1-xGax)MnO5+δ oxides

    Huang, X., Ni, C. & Irvine, J. T. S., 14 Aug 2019, In : Journal of Alloys and Compounds. 810, 151865.

    Research output: Contribution to journalArticle

  3. Synthesis and electrochemical characterization of La0.75Sr0.25Mn0.5Cr0.5‐xAlxO3, for IT- and HT- SOFCs

    Abdalla, A. M., Kamel, M., Hossain, S., Irvine, J. T. S. & Azad, A. K., 12 Sep 2019, In : International Journal of Applied Ceramic Technology. Early View

    Research output: Contribution to journalArticle

  4. Enhanced cycling performance of magnesium doped lithium cobalt phosphate

    Kim, E. J., Miller, D., Irvine, J. T. S. & Armstrong, A. R., 11 Sep 2019, (Accepted/In press) In : ChemElectroChem. In press

    Research output: Contribution to journalArticle

  5. Photo-catalytic hydrogen production over Au/g-C3N4: effect of gold particle dispersion and morphology

    Caux, M., Menard, H., AlSalik, Y. M., Irvine, J. T. S. & Idriss, H., 7 Aug 2019, In : Physical Chemistry Chemical Physics. 21, 29, p. 15974-15987 14 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Interface formation and Mn segregation of directly assembled La0.8Sr0.2MnO3 cathode on Y2O3-ZrO2 and Gd2O3-CeO2 electrolytes of solid oxide fuel cells

    He, S., Chen, K., Saunders, M., Quadir, Z., Tao, S., Irvine, J. T. S., Cui, C. Q. & Jiang, S. P., 1 Nov 2018, In : Solid State Ionics. 325, p. 176-188 13 p.

    Research output: Contribution to journalArticle

  2. Ionic conductivity in multiply substituted ceria-based electrolytes

    Coles-Aldridge, A. V. & Baker, R. T., Mar 2018, In : Solid State Ionics. 316, p. 9-19 11 p.

    Research output: Contribution to journalArticle

  3. Metal-oxide interactions for infiltrated Ni nanoparticles on A-site deficient LaxSr1 − 3x/2TiO3

    Hui, J., Neagu, D., Miller, D. N., Yue, X., Ni, C. & Irvine, J. T. S., Feb 2018, In : Solid State Ionics. 315, p. 126-130 5 p.

    Research output: Contribution to journalArticle

  4. Wet chemical synthesis and characterisation of Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3 − δ proton conductor

    Naeem Khan, M., Savaniu, C. D., Azad, A. K., Hing, P. & Irvine, J. T. S., May 2017, In : Solid State Ionics. 303, p. 52-57 6 p.

    Research output: Contribution to journalArticle

  5. Flux investigations on composite (La0.8Sr0.2)0.95Cr0.5Fe0.5O3 − δ–Sc0.198Ce0.012Zr0.789O1.90 oxygen transport membranes

    Dehaney-Steven, Z. A., Papargyriou, D. & Irvine, J. T. S., May 2016, In : Solid State Ionics. 288, p. 338-341 4 p.

    Research output: Contribution to journalArticle

ID: 118321