Electrochemical synthesis of ammonia based on doped-ceria-carbonate composite electrolyte and perovskite cathode

Ibrahim A Amar, Christophe TG Petit, Lei Zhang, Rong Lan, Peter J. Skabara, Shanwen Tao

    Research output: Contribution to journalArticle

    69 Citations (Scopus)

    Abstract

    Electrochemical synthesis of ammonia was investigated using a cobalt-free La0.6Sr0.4Fe0.8Cu0.2O3-δ-Ce0.8Sm0.2O2-δ (LSFCu-SDC) composite cathode and SDC-ternary carbonate composite electrolyte. La0.6Sr0.4Fe0.8Cu0.2O3-δ and Ce0.8Sm0.2O2-δ were prepared via combined EDTA-citrate complexing sol–gel and glycine nitrate processes, respectively, and characterised by X-ray diffraction (XRD). Ammonia was successfully synthesised from wet hydrogen and dry nitrogen under atmospheric pressure using Ni-SDC, SDC-carbonate and LSFCu-SDC composites as anode, electrolyte and cathode respectively. Ammonia formation was observed at 400, 425, 450 and 475 °C and the maximum rate of ammonia production was found to be 5.39 × 10−9 mol s−1 cm−2 at 450 °C and 0.8 V. The AC impedance measurements were recorded before and after the ammonia synthesis in the range of temperature 400–475 °C. The formation of ammonia at the N2 side together with stable current at 450 °C under constant voltage demonstrates that SDC-(Li/Na/K)2CO3 composite electrolyte exhibits significant proton conduction at a temperature around 450 °C.
    Original languageEnglish
    Pages (from-to)94-100
    Number of pages7
    JournalSolid State Ionics
    Volume201
    Issue number1
    Early online date9 Sep 2011
    DOIs
    Publication statusPublished - 19 Oct 2011

    Keywords

    • Electrochemical synthesis of ammonia
    • Perovskite
    • Composite anode
    • Doped ceria-carbonate composite electrolyte
    • Impedance spectroscopy

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