Degradation of conductivity and microstructure under thermal and current load in Ni-YSZ cermets for SOFC anodes

Karl Tor Sune Thydén, R. Barfod, Yuliang Liu

    Research output: Contribution to journalConference articleResearch

    Abstract

    The degradation of electrical conductivity in porous nickel-yttria stabilized zirconia composite cermets in a H2/H2O atmosphere under high temperature treatments has been investigated. The parameters varied were: temperature, water partial pressure, and electrical current load. The microstructure was analyzed before and after the treatment by optical microscopy and field emission scanning electron microscopy (FE-SEM). From the optical images the particle size and total amount of Ni, as area fraction, in the sample were measured. By the use of charge contrast (CC) in the FE-SEM particle size and area fraction of percolated Ni was measured. Temperature proved to have the largest effect on the degradation. Samples tested at 1000°C, in contrast to 750°C, showed a severe decrease of conductivity and growth of Ni particles. Higher water partial pressure accelerated Ni particle growth at both temperatures, but the loss of percolation and conductivity at 1000°C was less severe under high water partial pressure. A possible explanation for this behavior is discussed.
    Original languageEnglish
    Book seriesAdvances in Science and Technology
    Volume45
    Pages (from-to)1483-1488
    ISSN1662-0356
    DOIs
    Publication statusPublished - 2006
    EventInternational conferences on modern materials and technologies : International ceramics congress - Acireale (IT)
    Duration: 1 Jan 2006 → …
    Conference number: 11

    Conference

    ConferenceInternational conferences on modern materials and technologies : International ceramics congress
    Number11
    CityAcireale (IT)
    Period01/01/2006 → …

    Keywords

    • Micro-Structure
    • Electrical Conductivity
    • Solid Oxide Fuel Cell (SOFC)
    • Anode
    • Ni-YSZ

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