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

Amar, I. A., Petit, C. T.G., Zhang, L., Lan, R., Skabara, P. J. and Tao, S. (2011) Electrochemical synthesis of ammonia based on doped-ceria-carbonate composite electrolyte and perovskite cathode. Solid State Ionics, 201(1), pp. 94-100. (doi:10.1016/j.ssi.2011.08.003)

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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.

Item Type:Articles
Additional Information:The authors gratefully thank EPSRC for funding. One of the authors (Ibrahim A. Amar) thanks The Libyan Cultural Affairs, London for the financial support of his study in the UK.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Skabara, Professor Peter and Zhang, Dr Lei
Authors: Amar, I. A., Petit, C. T.G., Zhang, L., Lan, R., Skabara, P. J., and Tao, S.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Solid State Ionics
Publisher:Elsevier
ISSN:0167-2738
ISSN (Online):1872-7689
Published Online:09 September 2011

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