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. 2023 Mar 20;62(13):e202300054.
doi: 10.1002/anie.202300054. Epub 2023 Feb 15.

Tandem Electrocatalytic Nitrate Reduction to Ammonia on MBenes

Guike Zhang  1 , Xiaotian Li  1 , Kai Chen  1 , Yali Guo  1 , Dongwei Ma  2 , Ke Chu  1
Affiliations

Tandem Electrocatalytic Nitrate Reduction to Ammonia on MBenes

Guike Zhang et al. Angew Chem Int Ed Engl. .

Abstract

We demonstrate the great feasibility of MBenes as a new class of tandem catalysts for electrocatalytic nitrate reduction to ammonia (NO3 RR). As a proof of concept, FeB2 is first employed as a model MBene catalyst for the NO3 RR, showing a maximum NH3 -Faradaic efficiency of 96.8 % with a corresponding NH3 yield of 25.5 mg h-1 cm-2 at -0.6 V vs. RHE. Mechanistic studies reveal that the exceptional NO3 RR activity of FeB2 arises from the tandem catalysis mechanism, that is, B sites activate NO3 - to form intermediates, while Fe sites dissociate H2 O and increase *H supply on B sites to promote the intermediate hydrogenation and enhance the NO3 - -to-NH3 conversion.

Keywords: Electrocatalytic Nitrate Reduction to Ammonia; MBenes; Operando Electrochemical Characterizations; Tandem Catalysts; Theoretical Computations.

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