Jump to main content
Jump to site search

Issue 39, 2013
Previous Article Next Article

Electrochemical synthesis of ammonia directly from air and water using a Li+/H+/NH4+ mixed conducting electrolyte

Author affiliations

Abstract

Ammonia has been successfully synthesised directly from air and water using an electrochemical cell based on an H+/Li+/NH4+ mixed conducting membrane and Pt/C electrodes. It is found that the Nafion 211 membrane exhibits mixed H+/Li+ conduction after exchanging in 0.1 M Li2SO4 solution. The ionic conductivity of the mixed conductor is slightly lower than that of H+-form Nafion 211. The introduction of Li+ ions to the cell did not improve the ammonia formation rates in our experiments. Reasonably higher temperature may favour ammonia formation and the highest ammonia formation rate (9.37 × 10−6 mol m−2 s−1) and Faraday efficiency (0.83%) was obtained at 80 °C when a voltage of 1.2 V was applied. The ammonia formation rate decreased when 0.1 M Li2SO4 solution instead of water was used in the cell. Under the applied potential, the presence of Li+ ions might have a blocking effect on the transfer of protons resulting in a lower current at higher applied voltage, particularly at lower temperatures.

Graphical abstract: Electrochemical synthesis of ammonia directly from air and water using a Li+/H+/NH4+ mixed conducting electrolyte

Back to tab navigation

Publication details

The article was received on 06 Jul 2013, accepted on 30 Jul 2013 and first published on 05 Aug 2013


Article type: Paper
DOI: 10.1039/C3RA43432J
Citation: RSC Adv., 2013,3, 18016-18021
  •   Request permissions

    Electrochemical synthesis of ammonia directly from air and water using a Li+/H+/NH4+ mixed conducting electrolyte

    R. Lan and S. Tao, RSC Adv., 2013, 3, 18016
    DOI: 10.1039/C3RA43432J

Search articles by author

Spotlight

Advertisements