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Efficient tandem electroreduction of nitrate into ammonia through coupling Cu single atoms with adjacent Co3O4
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Efficient tandem electroreduction of nitrate into ammonia through coupling Cu single atoms with adjacent Co3O4
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Journal Article
Efficient tandem electroreduction of nitrate into ammonia through coupling Cu single atoms with adjacent Co3O4
2024
Overview
The nitrate (NO
3
−
) electroreduction into ammonia (NH
3
) represents a promising approach for sustainable NH
3
synthesis. However, the variation of adsorption configurations renders great difficulties in the simultaneous optimization of binding energy for the intermediates. Though the extensively reported Cu-based electrocatalysts benefit NO
3
−
adsorption, one of the key issues lies in the accumulation of nitrite (NO
2
−
) due to its weak adsorption, resulting in the rapid deactivation of catalysts and sluggish kinetics of subsequent hydrogenation steps. Here we report a tandem electrocatalyst by combining Cu single atoms catalysts with adjacent Co
3
O
4
nanosheets to boost the electroreduction of NO
3
−
to NH
3
. The obtained tandem catalyst exhibits a yield rate for NH
3
of 114.0 mg
NH
3
h
−1
cm
−2
, which exceeds the previous values for the reported Cu-based catalysts. Mechanism investigations unveil that the combination of Co
3
O
4
regulates the adsorption configuration of NO
2
−
and strengthens the binding with NO
2
−
, thus accelerating the electroreduction of NO
3
−
to NH
3
.
An optimal catalyst for nitrate electroreduction should satisfy the simultaneously optimized adsorption of intermediates. Here, the authors report a tandem electrocatalyst by combining Cu single atoms with Co
3
O
4
nanosheets, enhancing the binding with NO
2
−
, thus promoting nitrate electroreduction to NH
3
.
