The Effect of Humidity and Oxygen Partial Pressure on LSM–YSZ Cathode

Christina Knöfel, Ming Chen, Mogens Bjerg Mogensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Two series of anode supported solid oxide fuel cells (SOFC) were prepared, one with a composite cathode layer of lanthanum strontium manganite (LSM) and yttria stabilized zirconia (YSZ) on top and the other further has a LSM current collector layer on top. The fuel cells were heat treated at 1,000 °C in air or nitrogen choosing dry or humid (70% steam) conditions. XRD, SEM, and XPS investigations were performed on the various samples. The most severe modifications were observed in humid nitrogen atmosphere at low oxygen partial pressure. LSM surface change goes along with a decrease of manganese concentration and strontium enrichment on the surface of the materials. Formation of monoclinic zirconia and zirconate phases was also observed. These results give a closer insight into possible degradation mechanisms of SOFC composite cathode materials in dependence of humidity and oxygen partial pressure.
    Original languageEnglish
    JournalFuel Cells
    Volume11
    Issue number5
    Pages (from-to)669-677
    ISSN1615-6846
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Solid Oxide Fuel Cells

    Cite this

    @article{cff5e385b86441f2a5bad95648687167,
    title = "The Effect of Humidity and Oxygen Partial Pressure on LSM–YSZ Cathode",
    abstract = "Two series of anode supported solid oxide fuel cells (SOFC) were prepared, one with a composite cathode layer of lanthanum strontium manganite (LSM) and yttria stabilized zirconia (YSZ) on top and the other further has a LSM current collector layer on top. The fuel cells were heat treated at 1,000 °C in air or nitrogen choosing dry or humid (70{\%} steam) conditions. XRD, SEM, and XPS investigations were performed on the various samples. The most severe modifications were observed in humid nitrogen atmosphere at low oxygen partial pressure. LSM surface change goes along with a decrease of manganese concentration and strontium enrichment on the surface of the materials. Formation of monoclinic zirconia and zirconate phases was also observed. These results give a closer insight into possible degradation mechanisms of SOFC composite cathode materials in dependence of humidity and oxygen partial pressure.",
    keywords = "Solid Oxide Fuel Cells",
    author = "Christina Kn{\"o}fel and Ming Chen and Mogensen, {Mogens Bjerg}",
    year = "2011",
    doi = "10.1002/fuce.201100021",
    language = "English",
    volume = "11",
    pages = "669--677",
    journal = "Fuel Cells",
    issn = "1615-6846",
    publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
    number = "5",

    }

    The Effect of Humidity and Oxygen Partial Pressure on LSM–YSZ Cathode. / Knöfel, Christina; Chen, Ming; Mogensen, Mogens Bjerg.

    In: Fuel Cells, Vol. 11, No. 5, 2011, p. 669-677.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - The Effect of Humidity and Oxygen Partial Pressure on LSM–YSZ Cathode

    AU - Knöfel, Christina

    AU - Chen, Ming

    AU - Mogensen, Mogens Bjerg

    PY - 2011

    Y1 - 2011

    N2 - Two series of anode supported solid oxide fuel cells (SOFC) were prepared, one with a composite cathode layer of lanthanum strontium manganite (LSM) and yttria stabilized zirconia (YSZ) on top and the other further has a LSM current collector layer on top. The fuel cells were heat treated at 1,000 °C in air or nitrogen choosing dry or humid (70% steam) conditions. XRD, SEM, and XPS investigations were performed on the various samples. The most severe modifications were observed in humid nitrogen atmosphere at low oxygen partial pressure. LSM surface change goes along with a decrease of manganese concentration and strontium enrichment on the surface of the materials. Formation of monoclinic zirconia and zirconate phases was also observed. These results give a closer insight into possible degradation mechanisms of SOFC composite cathode materials in dependence of humidity and oxygen partial pressure.

    AB - Two series of anode supported solid oxide fuel cells (SOFC) were prepared, one with a composite cathode layer of lanthanum strontium manganite (LSM) and yttria stabilized zirconia (YSZ) on top and the other further has a LSM current collector layer on top. The fuel cells were heat treated at 1,000 °C in air or nitrogen choosing dry or humid (70% steam) conditions. XRD, SEM, and XPS investigations were performed on the various samples. The most severe modifications were observed in humid nitrogen atmosphere at low oxygen partial pressure. LSM surface change goes along with a decrease of manganese concentration and strontium enrichment on the surface of the materials. Formation of monoclinic zirconia and zirconate phases was also observed. These results give a closer insight into possible degradation mechanisms of SOFC composite cathode materials in dependence of humidity and oxygen partial pressure.

    KW - Solid Oxide Fuel Cells

    U2 - 10.1002/fuce.201100021

    DO - 10.1002/fuce.201100021

    M3 - Journal article

    VL - 11

    SP - 669

    EP - 677

    JO - Fuel Cells

    JF - Fuel Cells

    SN - 1615-6846

    IS - 5

    ER -