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Pyridine functionalized silver nanosheets for nitrate electroreduction
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2023-08, Vol.11 (3), p.1668-1673
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The nitrate electroreduction reaction (NO
3
RR) serves as an environmentally friendly method for ammonia (NH
3
) synthesis and effectively mitigates nitrate pollution in natural water bodies. The chemical functionalization of noble metal nanostructures can effectively enhance their activity and selectivity in electrocatalytic reactions. In this study, we successfully synthesized pyridine (Py) functionalized silver (Ag) nanosheets (Py-Ag NSs) as an electrocatalyst for NO
3
RR. Density functional theory calculation results revealed that the adsorbed pyridine modulated the electronic structure of Ag atoms, thereby facilitating the adsorption of nitrate ions and the following reduction steps. Consequently, Py-Ag NSs revealed significantly improved activity for NO
3
RR compared to pure Ag catalysts. Notably, at a potential of −0.53 V, Py-Ag NSs exhibited a faradaic efficiency and production rate of NH
3
reaching 96.6% and 72.664 mg h
−1
mg
cat
−1
, respectively. This work provides valuable insights into the modulation of electronic structures using a chemical functionalization strategy, thus guiding the rational design of noble metal-based electrocatalysts.
Crystal surface-selective and pyridine-functionalized Ag nanosheets can serve as high-performance Ag-based catalysts to improve the selectivity and yield of electrocatalytic nitrate reduction to ammonia.