Complementary techniques for solid oxide electrolysis cell characterisation at the micro- and nano-scale

D. Wiedenmann, Anne Hauch, B. Grobety, Mogens Bjerg Mogensen, U.F. Vogt

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    High-temperature steam electrolysis by solid oxide electrolysis cells (SOEC) is a method with great potential for transforming clean and renewable energy from non-fossil sources to synthetic fuels such as hydrogen, methane or dimethyl ether, which have been identified as promising alternative energy carriers. With the same technology, fuel gas can be used in a very efficient way to reconvert chemically stored energy into electrical energy, since SOECs also work in the reverse mode, operating as solid oxide fuel cells (SOFC). As solid oxide cells (SOC) perform at high-temperatures (700–900 °C), material degradation and evaporation can occur, e.g., from the cell-sealing material, leading to poisoning effects and aging mechanisms that decrease the cell efficiency and long-term durability. To investigate such cell degradation processes, thorough examination of SOCs often requires a chemical and structural characterisation at a microscopic and nanoscopic level. The combination of different microscopic techniques such as conventional scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and the focused ion beam (FIB) preparation technique for transmission electron microscopy (TEM) allows for post-mortem analysis at a multi-scale level. These complementary techniques can be used to characterise structural and chemical changes over a large and representative sample area (micro-scale) as well as at the nano-scale level for selected sample details. This article presents a methodical approach for the structural and chemical characterisation of changes in aged cathode-supported electrolysis cells produced at Risø DTU, Denmark. Additionally, we present results from the characterisation of impurities at the electrolyte/hydrogen interface caused by evaporation of sealing material.
    Original languageEnglish
    JournalInternational Journal of Hydrogen Energy
    Volume35
    Issue number10
    Pages (from-to)5053-5060
    ISSN0360-3199
    DOIs
    Publication statusPublished - 2010
    Event1st International Conference on Hydrogen Production - Oshawa (CA), 3-6 May
    Duration: 1 Jan 2009 → …

    Conference

    Conference1st International Conference on Hydrogen Production
    CityOshawa (CA), 3-6 May
    Period01/01/2009 → …

    Keywords

    • Fuel Cells and hydrogen
    • Electrolysis

    Cite this