Electrochemical synthesis of ammonia from N2 and H2O based on (Li,Na,K)2CO3-Ce0.8Gd 0.18Ca0.02O2-δ composite electrolyte and CoFe2O4 cathode

Ibrahim A. Amar, Christophe T. G. Petit, Gregory Mann, Rong Lan, Peter J. Skabara, Shanwen Tao

Research output: Contribution to journalArticle

33 Citations (Scopus)
654 Downloads (Pure)

Abstract

Electrochemical synthesis of ammonia from water vapour and nitrogen was investigated using an electrolytic cell based on CoFe2O 4-Ce0.8Gd0.18Ca0.02O 2-δ (CFO-CGDC), CGDC-ternary carbonate composite and Sm 0.5Sr0.5CoO3-δ-Ce0.8Gd 0.18Ca0.02O2-δ (SSCo-CGDC) as cathode, electrolyte and anode respectively. CoFe2O4, CGDC and SCCo were prepared via a combined EDTA-citrate complexing sol-gel and characterised by X-ray diffraction (XRD). The AC ionic conductivities of the CGDC-carbonate composite were investigated under three different atmospheres (air, dry O 2 and wet 5% H2-Ar). A tri-layer electrolytic cell was fabricated by a cost-effective one-step dry-pressing and co-firing process. Ammonia was successfully synthesised from water vapour and nitrogen under atmospheric pressure and the maximum rate of ammonia production was found to be 6.5 × 10-11 mol s-1 cm-2 at 400 C and 1.6 V which is two orders of magnitude higher than that of previous report when ammonia was synthesised from N2 and H2O at 650 C. 

Original languageEnglish
Pages (from-to)4322-4330
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number9
DOIs
Publication statusPublished - 18 Mar 2014

Keywords

  • co-doped ceria-carbonate composite electrolyte
  • electrochemical synthesis of ammonia
  • nitrogen
  • spinels
  • water

Fingerprint Dive into the research topics of 'Electrochemical synthesis of ammonia from N<sub>2</sub> and H<sub>2</sub>O based on (Li,Na,K)<sub>2</sub>CO<sub>3</sub>-Ce<sub>0.8</sub>Gd <sub>0.18</sub>Ca<sub>0.02</sub>O<sub>2-δ</sub> composite electrolyte and CoFe<sub>2</sub>O<sub>4</sub> cathode'. Together they form a unique fingerprint.

  • Projects

    Cite this