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

Ibrahim A. Amar, Rong Lan, C. T G Petit, Valeria Arrighi, Shanwen Tao

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64 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-LiAlO 2 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. © 2010 Elsevier B.V.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalSolid State Ionics
Volume182
Issue number1
DOIs
Publication statusPublished - 3 Feb 2011

Keywords

  • Carbonate
  • CoFe 2 O 4
  • Electrochemical synthesis of ammonia
  • Impedance spectroscopy
  • Proton conduction
  • Spinel catalyst

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