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Fe/Cu diatomic catalysts for electrochemical nitrate reduction to ammonia
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Fe/Cu diatomic catalysts for electrochemical nitrate reduction to ammonia
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Journal Article
Fe/Cu diatomic catalysts for electrochemical nitrate reduction to ammonia
2023
Overview
Electrochemical conversion of nitrate to ammonia offers an efficient approach to reducing nitrate pollutants and a potential technology for low-temperature and low-pressure ammonia synthesis. However, the process is limited by multiple competing reactions and NO
3
−
adsorption on cathode surfaces. Here, we report a Fe/Cu diatomic catalyst on holey nitrogen-doped graphene which exhibits high catalytic activities and selectivity for ammonia production. The catalyst enables a maximum ammonia Faradaic efficiency of 92.51% (−0.3 V(RHE)) and a high NH
3
yield rate of 1.08 mmol h
−1
mg
−1
(at − 0.5 V(RHE)). Computational and theoretical analysis reveals that a relatively strong interaction between NO
3
−
and Fe/Cu promotes the adsorption and discharge of NO
3
−
anions. Nitrogen-oxygen bonds are also shown to be weakened due to the existence of hetero-atomic dual sites which lowers the overall reaction barriers. The dual-site and hetero-atom strategy in this work provides a flexible design for further catalyst development and expands the electrocatalytic techniques for nitrate reduction and ammonia synthesis.
Nitrate electroreduction to ammonia can decrease pollutants and produce high-value ammonia. Here, the authors design a Fe/Cu diatomic catalyst on nitrogen-doped graphene, which exhibits high catalytic activities of and selectivity for ammonia.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
