Durability study of an intermediate temperature fuel cell based on an oxide–carbonate composite electrolyte

Lei Zhang, Rong Lan, Christophe TG Petit, Shanwen Tao

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    It was reported that ceria–carbonate composites are promising electrolyte materials for intermediate temperature fuel cells. The conductivity stability of composite electrolyte with co-doped ceria and binary carbonate was measured by AC impedance spectroscopy. At 550 °C, the conductivity dropped from 0.26 to 0.21 S cm−1 in air during the measured 135 h. At a constant current density of 1 A cm−2, the cell performance keeps decreasing at 550 °C, with a maximum power density change from 520 to 300 mW cm−2. This is due to the increase of both series and electrode polarisation resistances. Obvious morphology change of the electrolyte nearby the cathode/electrolyte interface was observed by SEM. Both XRD and FT-IR investigations indicate that there are some interactions between the doped ceria and carbonates. Thermal analysis indicates that the oxide–carbonate composite is quite stable at 550 °C. The durability of this kind of fuel cell is not good during our experiments. A complete solid oxide-carbonate composite would be better choice for a stable fuel cell performance.
    Original languageEnglish
    Pages (from-to)6934-6940
    Number of pages7
    JournalInternational Journal of Hydrogen Energy
    Volume35
    Issue number13
    Early online date13 May 2010
    DOIs
    Publication statusPublished - 1 Jul 2010

    Keywords

    • Intermediate temperature
    • Fuel cell
    • Durability
    • Co-doped ceria
    • Composite electrolyte

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