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Ampere-level current density ammonia electrochemical synthesis using CuCo nanosheets simulating nitrite reductase bifunctional nature
The development of electrocatalysts capable of efficient reduction of nitrate (NO(3)(−)) to ammonia (NH(3)) is drawing increasing interest for the sake of low carbon emission and environmental protection. Herein, we present a CuCo bimetallic catalyst able to imitate the bifunctional nature of copper...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9780304/ https://www.ncbi.nlm.nih.gov/pubmed/36550156 http://dx.doi.org/10.1038/s41467-022-35533-6 |
Sumario: | The development of electrocatalysts capable of efficient reduction of nitrate (NO(3)(−)) to ammonia (NH(3)) is drawing increasing interest for the sake of low carbon emission and environmental protection. Herein, we present a CuCo bimetallic catalyst able to imitate the bifunctional nature of copper-type nitrite reductase, which could easily remove NO(2)(−) via the collaboration of two active centers. Indeed, Co acts as an electron/proton donating center, while Cu facilitates NO(x)(−) adsorption/association. The bio-inspired CuCo nanosheet electrocatalyst delivers a 100 ± 1% Faradaic efficiency at an ampere-level current density of 1035 mA cm(−2) at −0.2 V vs. Reversible Hydrogen Electrode. The NH(3) production rate reaches a high activity of 4.8 mmol cm(−2) h(−1) (960 mmol g(cat)(−1) h(−1)). A mechanistic study, using electrochemical in situ Fourier transform infrared spectroscopy and shell-isolated nanoparticle enhanced Raman spectroscopy, reveals a strong synergy between Cu and Co, with Co sites promoting the hydrogenation of NO(3)(−) to NH(3) via adsorbed *H species. The well-modulated coverage of adsorbed *H and *NO(3) led simultaneously to high NH(3) selectivity and yield. |
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