Ambient ammonia production via electrocatalytic nitrite reduction catalyzed by a CoP nanoarray

Industrial-scale ammonia (NH 3 ) production mainly relies on the energy-intensive and environmentally unfriendly Haber-Bosch process. Such issue can be avoided by electrocatalytic N 2 reduction which however suffers from limited current efficiency and NH 3 yield. Herein, we demonstrate ambient NH 3...

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Published in:Nano research 2022-02, Vol.15 (2), p.972-977
Main Authors: Wen, Guilai, Liang, Jie, Liu, Qian, Li, Tingshuai, An, Xuguang, Zhang, Fang, Alshehri, Abdulmohsen Ali, Alzahrani, Khalid Ahmed, Luo, Yonglan, Kong, Qingquan, Sun, Xuping
Format: Article
Language:English
Subjects:
Ammonia
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Current efficiency
Density functional theory
Efficiency
Electrochemistry
Electrodes
Haber Bosch process
Materials Science
Meat industry
Microscopy
Nanotechnology
Nitrogen dioxide
Reagents
Reduction
Research Article
Titanium
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Summary:Industrial-scale ammonia (NH 3 ) production mainly relies on the energy-intensive and environmentally unfriendly Haber-Bosch process. Such issue can be avoided by electrocatalytic N 2 reduction which however suffers from limited current efficiency and NH 3 yield. Herein, we demonstrate ambient NH 3 production via electrochemical nitrite (NO 2 − ) reduction catalyzed by a CoP nanoarray on titanium mesh (CoP NA/TM). When tested in 0.1 M PBS (pH = 7) containing 500 ppm NO 2 − , such CoP NA/TM is capable of affording a large NH 3 yield of 2,260.7 ± 51.5 µg·h −1 ·cm −2 and a high Faradaic efficiency of 90.0 ± 2.3% at −0.2 V vs. a reversible hydrogen electrode. Density functional theory calculations reveal that the potential-determining step for NO 2 − reduction over CoP (112) is *NO 2 → *NO 2 H.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-021-3583-9