Skip to content

Research at St Andrews

Mixed conductivity and electrochemical behavior of (La0.75Sr0.25)0.95Cr0.5Mn0.5O3 − δ

Research output: Contribution to journalArticle

Author(s)

John Thomas Sirr Irvine, VV Kharton, EV Tsipis, IP Marozau,, AP Viskup, JR Frade

School/Research organisations

Abstract

The electronic and oxygen-ionic transport in (La0.75Sr0.25)(0.95)Cr0.5Mn0.5O3-delta, a member of promising family of solid oxide fuel cell (SOFC) anode materials, was studied at 1023-1273 K in the oxygen partial pressure range from 10(-2)0 to 0.5 atm. In oxidizing and moderately reducing atmospheres, this perovskite exhibits a predominant p-type electronic conductivity, which ties in the range 20-35 S/cm and is essentially p(O-2)-independent. Reducing p(O-2) below 10(-16)-10(-12) atm leads to a drastic increase in the oxygen vacancy concentration, ionic conductivity and oxygen permeability, whilst the total conductivity decreases down to 1-3 S/cm. The ion transference numbers, calculated from the oxygen permeation data and measured by the faradaic efficiency technique controlling oxygen pressures at both sides of dense ceramic membranes, vary in the range 9 x 10(-7) to 8 x 10(-5) at 1223-1273 K, increasing with temperature. The average thermal expansion coefficients in air increases from 10.8 x 10(-6) K-1 at 373-923 K up to 14.1 x 10(-6) K-1 at 1223-1523 K. Under both oxidizing and reducing conditions, the electrochemical behavior of porous (La-0.75 Sr-0.25)(0.95)Cr0.5Mn0.5O3-based electrodes applied onto (La0.9Sr0.1)(0.98)Ga0.8Mg0.2O3-delta solid electrolyte suggests a key role of electronic transport-related processes. As a result, the electrode performance can be significantly enhanced by optimizing current collector and/or by introducing an additional electronically-conductive component, such as metallic Ni or Ag. Further decrease of overpotentials may be achieved via incorporation of electrocatalytically active additions, including praseodymium oxide in oxidizing atmospheres and ceria at low P(O-2). (c) 2006 Elsevier B.V. All rights reserved.

Close

Details

Original languageEnglish
Pages (from-to)101-113
Number of pages13
JournalSolid State Ionics
Volume178
DOIs
Publication statusPublished - 31 Jan 2007

    Research areas

  • perovskite, SOFC anode, mixed conductivity, oxygen permeation, faradaic efficiency, dilatometry, electrode polarization, OXIDE FUEL-CELLS, PEROVSKITE-TYPE OXIDE, CERAMIC MICROSTRUCTURE, CATHODIC POLARIZATION, ELECTRICAL-PROPERTIES, TRANSPORT-PROPERTIES, ELECTRODE PROPERTIES, STABILIZED ZIRCONIA, OXYGEN PERMEABILITY, ANODES

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

View graph of relations

Related by author

  1. An FeNbO4-based oxide anode for a solid oxide fuel cell (SOFC)

    Liu, X., Xie, D., Irvine, J. T. S., Ni, J. & Ni, C., 11 Jan 2020, In : Electrochimica Acta. In press, 135692.

    Research output: Contribution to journalArticle

  2. A B-site doped perovskite ferrate for efficient anode of a solid oxide fuel cell with in situ metal exsolution

    Ni, C., Zeng, Q., He, D., Peng, L., Xie, D., Irvine, J. T. S., Duan, S. & Ni, J., 21 Dec 2019, In : Journal of Materials Chemistry A. 7, 47, p. 26944-26953 10 p.

    Research output: Contribution to journalArticle

  3. 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 Dec 2019, In : Nature Communications. 10, 8 p., 1471.

    Research output: Contribution to journalArticle

  4. Hexagonal perovskite related oxide ion conductor Ba3NbMoO8.5: phase transition, temperature evolution of the local structure and properties

    Chambers, M. S., McCombie, K. S., Auckett, J. E., McLaughlin, A. C., Irvine, J. T. S., Chater, P. A., Evans, J. S. O. & Evans, I. R., 28 Nov 2019, In : Journal of Materials Chemistry. 7, 44, p. 25503-25510 8 p.

    Research output: Contribution to journalArticle

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

    Huang, X., Ni, C. & Irvine, J. T. S., 25 Nov 2019, In : Journal of Alloys and Compounds. 810, 151865.

    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: 407960

Top