Electrochemical characterisation of solid oxide cell electrodes for hydrogen production

Carlos Bernuy-Lopez, Ruth Knibbe, Zeming He, Xiaojian Mao, Anne Hauch, Karsten Agersted Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Oxygen electrodes and steam electrodes are designed and tested to develop improved solid oxide electrolysis cells for H2 production with the cell support on the oxygen electrode. The electrode performance is evaluated by impedance spectroscopy testing of symmetric cells at open circuit voltage (OCV) in a one-atmosphere set-up. For the oxygen electrode, nano-structured La0.75Sr0.25MnO3 (LSM25) is impregnated into a LSM25/yttria stabilised zirconia (YSZ) composite, whereas for the steam electrode, nano-structured Ni and Ce0.8Gd0.2O2−δ (CGO) is impregnated into a Sr0.94Ti0.9Nb0.10O3−δ (STN) backbone. In the present study, the best performing oxygen electrode is a LSM25-YSZ composite with 20% porosity and impregnated with a LSM25 solution measuring a polarisation resistance (Rp) of 0.12 Ω cm2 at 850 °C in oxygen. For the steam electrode, the best performance is obtained for a STN backbone, sintered at 1200 °C and impregnated with CGO/Ni, with an Rp of 0.08 Ω cm2 at 850 °C in 3% H2O/H2.
    Original languageEnglish
    JournalJournal of Power Sources
    Volume196
    Issue number9
    Pages (from-to)4396-4403
    ISSN0378-7753
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and Hydrogen

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