Electrochemical synthesis of ammonia from N2 and H2O based on (Li, Na, K) 2CO3–Ce0. 8Gd0. 18Ca0. 02O2− δ composite electrolyte and CoFe2O4 cathode

Ibrahim A Amar, Christophe TG Petit, Rong Lan, Gregory Mann, Peter. J. Skabara, Shanwen Tao

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    Electrochemical synthesis of ammonia from water vapour and nitrogen was investigated
    using an electrolytic cell based on CoFe2O4eCe0.8Gd0.18Ca0.02O2d (CFO-CGDC), CGDCternary
    carbonate composite and Sm0.5Sr0.5CoO3deCe0.8Gd0.18Ca0.02O2d (SSCo-CGDC) as
    cathode, electrolyte and anode respectively. CoFe2O4, CGDC and SCCo were prepared via a
    combined EDTA-citrate complexing solegel and characterised by X-ray diffraction (XRD).
    The AC ionic conductivities of the CGDC-carbonate composite were investigated under
    three different atmospheres (air, dry O2 and wet 5% H2eAr). A tri-layer electrolytic cell was
    fabricated by a cost-effective one-step dry-pressing and co-firing process. Ammonia was
    successfully synthesised from water vapour and nitrogen under atmospheric pressure and
    the maximum rate of ammonia production was found to be 6.5 1011 mol s1 cm2 at
    400 C and 1.6 V which is two orders of magnitude higher than that of previous report when
    ammonia was synthesised from N2 and H2O at 650 C.
    Copyright ª 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights
    reserved.
    Original languageEnglish
    Pages (from-to)4322-4330
    Number of pages9
    JournalInternational Journal of Hydrogen Energy
    Volume39
    Issue number9
    Early online date8 Feb 2014
    DOIs
    Publication statusPublished - 2014

    Keywords

    • Electrochemical synthesis of
    • Ammonia
    • Water
    • Nitrogen
    • Spinels
    • Co-doped ceria-carbonate composite electrolyte

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