Electrochemical synthesis of ammonia based on a carbonate-oxide composite electrolyte

Ibrahim A Amar, Rong Lan, Christophe TG Petit, Valeria Arrighi, Shanwen Tao

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    66 Citations (Scopus)

    Abstract

    Electrochemical synthesis of ammonia based on carbonate electrolyte is presented in this paper. Spinel oxide CoFe2O4 was synthesised via a co-precipitation method and characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ammonia was successfully synthesised from hydrogen and nitrogen under atmospheric pressure using CoFe2O4 as catalyst (primary particle size 10–20 nm) together with silver at the cathode, Ag–Pd at the anode and carbonate-LiAlO2 composite as electrolyte respectively. Ammonia formation was observed at 400, 425 and 450 °C and the maximum rate of ammonia production was found to be 2.32 × 10−10 mol s−1 cm−2 at 400 °C and 0.8 V. The AC impedance measurements were recorded before and after the ammonia synthesis at 400, 425 and 450 °C. The electrolytic cell during the ammonia synthesis process was more stable at 450 °C and 0.8 V over a period of 2 h. This experiment also indicates that the carbonate-LiAlO2 composite electrolyte exhibits proton conduction.
    Original languageEnglish
    Pages (from-to)133-138
    Number of pages6
    JournalSolid State Ionics
    Volume182
    Issue number1
    Early online date13 Dec 2010
    DOIs
    Publication statusPublished - 3 Feb 2011

    Keywords

    • Electrochemical synthesis of ammonia
    • Carbonate
    • Proton conduction
    • CoFe2O4
    • Spinel catalyst
    • Impedance spectroscopy

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