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Ampere-level current density ammonia electrochemical synthesis using CuCo nanosheets simulating nitrite reductase bifunctional nature
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Ampere-level current density ammonia electrochemical synthesis using CuCo nanosheets simulating nitrite reductase bifunctional nature
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Journal Article
Ampere-level current density ammonia electrochemical synthesis using CuCo nanosheets simulating nitrite reductase bifunctional nature
2022
Overview
The development of electrocatalysts capable of efficient reduction of nitrate (NO
3
−
) to ammonia (NH
3
) is drawing increasing interest for the sake of low carbon emission and environmental protection. Herein, we present a CuCo bimetallic catalyst able to imitate the bifunctional nature of copper-type nitrite reductase, which could easily remove NO
2
−
via the collaboration of two active centers. Indeed, Co acts as an electron/proton donating center, while Cu facilitates NO
x
−
adsorption/association. The bio-inspired CuCo nanosheet electrocatalyst delivers a 100 ± 1% Faradaic efficiency at an ampere-level current density of 1035 mA cm
−2
at −0.2 V
vs
. Reversible Hydrogen Electrode. The NH
3
production rate reaches a high activity of 4.8 mmol cm
−2
h
−1
(960 mmol g
cat
−1
h
−1
). A mechanistic study, using electrochemical in situ Fourier transform infrared spectroscopy and shell-isolated nanoparticle enhanced Raman spectroscopy, reveals a strong synergy between Cu and Co, with Co sites promoting the hydrogenation of NO
3
−
to NH
3
via adsorbed *H species. The well-modulated coverage of adsorbed *H and *NO
3
led simultaneously to high NH
3
selectivity and yield.
Electroreduction of NO
3
−
to NH
3
is drawing increasing interest. Here, the authors designed a CuCo catalyst imitating the bifunctional nature of Cu-type nitrite reductase to deliver an ampere-level current density for NH
3
formation.
