TY - JOUR
T1 - Electrochemical Ammonia Generation Directly from Nitrogen and Air Using an Iron-Oxide/Titania-Based Catalyst at Ambient Conditions
AU - Manjunatha, Revanasiddappa
AU - Karajić, Aleksandar
AU - Goldstein, Valentina
AU - Schechter, Alex
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/2/27
Y1 - 2019/2/27
N2 - Ammonia was produced electrochemically from nitrogen/air in aqueous alkaline electrolytes by using a Fe 2 O 3 /TiO 2 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 â'0.577 V. The chronoamperometric experiments on Fe 2 O 3 /TiO 2 /C clearly confirmed that Fe 2 O 3 along with TiO 2 shows superior nitrogen reduction reaction activity compared to Fe 2 O 3 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.
AB - Ammonia was produced electrochemically from nitrogen/air in aqueous alkaline electrolytes by using a Fe 2 O 3 /TiO 2 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 â'0.577 V. The chronoamperometric experiments on Fe 2 O 3 /TiO 2 /C clearly confirmed that Fe 2 O 3 along with TiO 2 shows superior nitrogen reduction reaction activity compared to Fe 2 O 3 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.
KW - ambient conditions
KW - electrochemical mass spectrometry
KW - iron oxide
KW - nitrogen reduction reaction
KW - titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=85061901230&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b20692
DO - 10.1021/acsami.8b20692
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C2 - 30724064
AN - SCOPUS:85061901230
SN - 1944-8244
VL - 11
SP - 7981
EP - 7989
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 8
ER -