We demonstrate the great feasibility of MBenes as a new class of tandem catalysts for electrocatalytic nitrate reduction to ammonia (NO 3 RR). As a proof of concept, FeB 2 is first employed as a model MBene catalyst for the NO 3 RR, showing a maximum NH 3 -Faradaic efficiency of 96.8 % with a corresponding NH 3 yield of 25.5 mg h À 1 cm À 2 at À 0.6 V vs. RHE. Mechanistic studies reveal that the exceptional NO 3 RR activity of FeB 2 arises from the tandem catalysis mechanism, that is, B sites activate NO 3 À to form intermediates, while Fe sites dissociate H 2 O and increase *H supply on B sites to promote the intermediate hydrogenation and enhance the NO 3 À -to-NH 3 conversion.
Electrochemical reduction of nitrate to ammonia (NO 3 RR) has been recognized as an appealing approach to realize both sustainable NH 3 production and waste nitrate removal. Herein, from the perspective of Lewis acid-base interaction, a single-atom Fe-doped V 2 O 5 (Fe-V 2 O 5 ) catalyst enriched is designed with Lewis acid sites, which present the maximum NH 3 -Faradaic efficiency of 97.1% with the corresponding NH 3 yield of 12.5 mg h −1 cm −2 at -0.7 V versus RHE. Mechanistic studies based on theoretical calculations and operando spectroscopic characterizations identify the creation of Lewis acid Fe-V pairs on Fe-V 2 O 5 , which can synergetically activate the NO 3 − , promote the hydrogenation energetics, and restrain the hydrogen evolution, leading to the enhanced NO 3 RR activity and selectivity.
Electrocatalytic NO reduction to NH3 (NORR) emerges as an attractive approach to simultaneously realize NO abatement and ammonia generation. Herein, we first demonstrate that p-block Sn-based materials are promising NORR...
Electrocatalytic reduction of nitrate to ammonia (NO3RR) represents a highly appealing route for achieving both value-added NH3 synthesis and facile removal of waste nitrate. In this study, Ce-doped and S-vacancy-enriched...
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