Electrochemical synthesis of ammonia from wet nitrogen via a dual-chamber reactor using La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Gd0.18Ca0.02O2−δ composite cathode

Ibrahim A Amar, Rong Lan, John Humphreys, Shanwen Tao

    Research output: Contribution to journalArticle

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    Abstract

    A La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Gd0.18Ca0.02O2−δ composite cathode was used to investigate the electrochemical synthesis of ammonia from wet nitrogen. Wet nitrogen was flown through a dual chamber reactor under atmospheric pressure leading to the successful synthesis of ammonia. Ammonia was synthesised at a rate of 1.5 × 10−10 mol s−1 cm−2 at 400 °C when applying a dc voltage of 1.4 V, which is the highest reported to date. This rate is twice that of the observed ammonia formation rate (7 × 10−11 mol s−1 cm−2) when Co-free cathode, La0.6Sr0.4FeO3−δ-Ce0.8Gd0.18Ca0.02O2−δ was used as the cathode catalyst. A higher catalytic activity for ammonia synthesis may be obtained when using a catalyst with high oxygen vacancies, with the introduction of oxygen vacancies at the cathode being a good strategy to improve the catalytic activity of ammonia synthesis.
    Original languageEnglish
    Pages (from-to)51-56
    Number of pages6
    JournalCatalysis Today
    Volume286
    Early online date17 Sep 2016
    DOIs
    Publication statusPublished - 15 May 2017

    Fingerprint

    Ammonia
    Cathodes
    Nitrogen
    Composite materials
    Oxygen vacancies
    Catalyst activity
    Catalysts
    Atmospheric pressure
    Electric potential

    Bibliographical note

    This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

    Keywords

    • Electrochemical synthesis
    • Ammonia
    • Oxygen vacancy
    • Oxide-carbonate composite electrolyte
    • La0.6Sr0.4Co0.2Fe0.8O3−δ

    Cite this

    Electrochemical synthesis of ammonia from wet nitrogen via a dual-chamber reactor using La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Gd0.18Ca0.02O2−δ composite cathode. / Amar, Ibrahim A; Lan, Rong; Humphreys, John; Tao, Shanwen .

    In: Catalysis Today, Vol. 286, 15.05.2017, p. 51-56.

    Research output: Contribution to journalArticle

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    abstract = "A La0.6Sr0.4Co0.2Fe0.8O3−δ-Ce0.8Gd0.18Ca0.02O2−δ composite cathode was used to investigate the electrochemical synthesis of ammonia from wet nitrogen. Wet nitrogen was flown through a dual chamber reactor under atmospheric pressure leading to the successful synthesis of ammonia. Ammonia was synthesised at a rate of 1.5 × 10−10 mol s−1 cm−2 at 400 °C when applying a dc voltage of 1.4 V, which is the highest reported to date. This rate is twice that of the observed ammonia formation rate (7 × 10−11 mol s−1 cm−2) when Co-free cathode, La0.6Sr0.4FeO3−δ-Ce0.8Gd0.18Ca0.02O2−δ was used as the cathode catalyst. A higher catalytic activity for ammonia synthesis may be obtained when using a catalyst with high oxygen vacancies, with the introduction of oxygen vacancies at the cathode being a good strategy to improve the catalytic activity of ammonia synthesis.",
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    AU - Humphreys, John

    AU - Tao, Shanwen

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