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

Ibrahim Ali Ahmed Amar, Rong Lan, Christophe TG Petit, Valeria Arrighi, Shanwen Tao

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Abstract

Electrochemical synthesis of ammonia based on carbonate electrolyte is presented in this paper. Spinel oxide CoFe(2)O(4) 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 CoFe(2)O(4) 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 degrees C and the maximum rate of ammonia production was found to be 2.32 x 10(-10) mol s(-1) cm(-2) at 400 degrees C and 0.8 V. The AC impedance measurements were recorded before and after the ammonia synthesis at 400, 425 and 450 degrees C. The electrolytic cell during the ammonia synthesis process was more stable at 450 degrees C and 0.8 V over a period of 2 h. This experiment also indicates that the carbonate-LiAlO(2) composite electrolyte exhibits proton conduction.
Original languageEnglish
Pages (from-to)133 - 138
Number of pages6
JournalSolid State Ionics
Volume182
Issue number1
DOIs
Publication statusPublished - 2011
Externally publishedYes

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