Electrochemical Ammonia Generation Directly from Nitrogen and Air Using an Iron-Oxide/Titania-Based Catalyst at Ambient Conditions

Ammonia was produced electrochemically from nitrogen/air in aqueous alkaline electrolytes by using a Fe2O3/TiO2 composite catalyst under room temperature and atmospheric pressure. At an applied potential of 0.023 V versus reversible hydrogen electrode, the rate of ammonia formation was 1.25 × 10–8 m...

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Veröffentlicht in:ACS applied materials & interfaces 2019-02, Vol.11 (8), p.7981-7989
Hauptverfasser: Manjunatha, Revanasiddappa, Karajić, Aleksandar, Goldstein, Valentina, Schechter, Alex
Format: Artikel
Sprache:eng
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Zusammenfassung:Ammonia was produced electrochemically from nitrogen/air in aqueous alkaline electrolytes by using a Fe2O3/TiO2 composite catalyst under room temperature and atmospheric pressure. At an applied potential of 0.023 V versus reversible hydrogen electrode, the rate of ammonia formation was 1.25 × 10–8 mmol mg–1 s–1 at an overpotential of just 34 mV. This rate increased to 2.7 × 10–7 mmol mg–1 s–1 at −0.577 V. The chronoamperometric experiments on Fe2O3/TiO2/C clearly confirmed that Fe2O3 along with TiO2 shows superior nitrogen reduction reaction activity compared to Fe2O3 alone. Experimental parameters such as temperature and applied potential have a significant influence on the rate of ammonia formation. The activation energy of nitrogen reduction on the employed catalyst was found to be 25.8 kJ mol–1. Real-time direct electrochemical mass spectrometry analysis was used to monitor the composition of the evolved gases at different electrode potentials.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.8b20692