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High-efficiency electrochemical nitrite reduction to ammonium using a CuP nanowire array under ambient conditions
Electrochemical reduction of nitrite addresses the need for nitrite contaminant removal and provides an on-site, cost-effective, and sustainable route for rapidly generating ammonia/ammonium. Its practical implementation however requires advanced electrocatalysts with enhanced ammonium yield rates a...
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| Published in: | Green chemistry : an international journal and green chemistry resource : GC 2021-08, Vol.23 (15), p.5487-5493 |
|---|---|
| Main Authors: | , , , , , , , , , , |
| Format: | Article |
| Language: | |
| Online Access: | Get full text |
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| Summary: | Electrochemical reduction of nitrite addresses the need for nitrite contaminant removal and provides an on-site, cost-effective, and sustainable route for rapidly generating ammonia/ammonium. Its practical implementation however requires advanced electrocatalysts with enhanced ammonium yield rates and faradaic efficiencies. Our study here introduces a Cu
3
P nanowire array supported on copper foam (Cu
3
P NA/CF) for the first time as an efficient electrocatalyst for nitrite-to-ammonium conversion in neutral media. In 0.1 M phosphate buffered saline containing 0.1 M NaNO
2
, the freestanding Cu
3
P NA/CF electrode displays a large ammonium yield rate of 1626.6 ± 36.1 μg h
−1
cm
−2
and a high FE of 91.2 ± 2.5% at −0.5 V
vs.
a reversible hydrogen electrode, with good stability. The catalytic mechanism is revealed by density functional theory calculations.
Cu
3
P enables ambient electrosynthesis of ammonium
via
selective NO
2
−
reduction, achieving a yield rate of 1626.6 ± 36.1 μg h
−1
cm
−2
and a Faradaic efficiency of 91.2 ± 2.5%. The catalytic mechanism is investigated by theoretical calculations. |
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| ISSN: | 1463-9262 1463-9270 |
| DOI: | 10.1039/d1gc01614h |