Oxygen transport properties of dense and porous (La0.8Sr0.2)0.99Co0.8Ni0.2O3-δ

Per Hjalmarsson, Martin Søgaard, Mogens Bjerg Mogensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We have determined kex and Dchem for (La0.8Sr0.2)0.99Co0.8Ni0.2O3-δ by the use of electrical conductivity relaxation on a dense sample and by applying the ALS model to measured AC impedance spectrum on a porous electrode. Extracting kex and Dchem from the methods resulted in comparable values. kex and Dchem also agreed well with literature values on La0.8Sr0.2CoO3-δ, indicating that nickel substitution does not change the oxygen transport properties. kex of the porous sample was further found to decrease with a five times higher rate than Dchem when measured by using an Electrochemical Impedance Spectroscopy (EIS) over several days.
    Original languageEnglish
    JournalSolid State Ionics
    Volume180
    Issue number23-25
    Pages (from-to)1290-1297
    ISSN0167-2738
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and hydrogen

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