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

Ibrahim A. Amar, Christophe T. G. Petit, Lei Zhang, Rong Lan, Shanwen Tao, Peter Skabara

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Electrochemical synthesis of ammonia was investigated using a cobalt-free La0.6Sr0.4Fe0.8Cu0.2O3-delta-Ce-0.8-sm(0.2)O(2-delta) (LSFCu-SDC) composite cathode and SDC-ternary carbonate composite electrolyte. La0.6Sr0.4Fe0.8-Cu0.2O3-delta and Ce0.8Sm0.2O2-delta 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 degrees C and the maximum rate of ammonia production was found to be 5.39 x 10(-9) mol s(-1) cm(-2) at 450 degrees C and 0.8 V. The AC impedance measurements were recorded before and after the ammonia synthesis in the range of temperature 400-475 degrees C. The formation of ammonia at the N-2 side together with stable current at 450 degrees C under constant voltage demonstrates that SDC-(Li/Na/K)(2)CO3 composite electrolyte exhibits significant proton conduction at a temperature around 450 degrees C. (C) 2011 Elsevier BM. All rights reserved.

LanguageEnglish
Pages94-100
Number of pages7
JournalSolid State Ionics
Volume201
Issue number1
DOIs
Publication statusPublished - 19 Oct 2011

Fingerprint

electrochemical synthesis
Carbonates
Cerium compounds
Ammonia
Perovskite
Electrolytes
ammonia
carbonates
Cathodes
cathodes
electrolytes
composite materials
Composite materials
ethylenediaminetetraacetic acids
Ethylenediaminetetraacetic acid
impedance measurement
citrates
glycine
Cobalt
Edetic Acid

Keywords

  • solid state ionics
  • ammonia
  • doped-ceria-carbonate
  • electrolyte
  • perovskite cathode
  • TIC - Bionanotechnology

Cite this

Amar, Ibrahim A. ; Petit, Christophe T. G. ; Zhang, Lei ; Lan, Rong ; Tao, Shanwen ; Skabara, Peter. / Electrochemical synthesis of ammonia based on doped-ceria-carbonate composite electrolyte and perovskite cathode. In: Solid State Ionics . 2011 ; Vol. 201, No. 1. pp. 94-100.
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Electrochemical synthesis of ammonia based on doped-ceria-carbonate composite electrolyte and perovskite cathode. / Amar, Ibrahim A.; Petit, Christophe T. G.; Zhang, Lei; Lan, Rong; Tao, Shanwen; Skabara, Peter.

In: Solid State Ionics , Vol. 201, No. 1, 19.10.2011, p. 94-100.

Research output: Contribution to journalArticle

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T1 - Electrochemical synthesis of ammonia based on doped-ceria-carbonate composite electrolyte and perovskite cathode

AU - Amar, Ibrahim A.

AU - Petit, Christophe T. G.

AU - Zhang, Lei

AU - Lan, Rong

AU - Tao, Shanwen

AU - Skabara, Peter

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AB - Electrochemical synthesis of ammonia was investigated using a cobalt-free La0.6Sr0.4Fe0.8Cu0.2O3-delta-Ce-0.8-sm(0.2)O(2-delta) (LSFCu-SDC) composite cathode and SDC-ternary carbonate composite electrolyte. La0.6Sr0.4Fe0.8-Cu0.2O3-delta and Ce0.8Sm0.2O2-delta 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 degrees C and the maximum rate of ammonia production was found to be 5.39 x 10(-9) mol s(-1) cm(-2) at 450 degrees C and 0.8 V. The AC impedance measurements were recorded before and after the ammonia synthesis in the range of temperature 400-475 degrees C. The formation of ammonia at the N-2 side together with stable current at 450 degrees C under constant voltage demonstrates that SDC-(Li/Na/K)(2)CO3 composite electrolyte exhibits significant proton conduction at a temperature around 450 degrees C. (C) 2011 Elsevier BM. All rights reserved.

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