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

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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

    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

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