High-efficiency electrosynthesis of ammonia with selective reduction of nitrite over an Ag nanoparticle-decorated TiO2 nanoribbon array

Electrochemical nitrite (NO2−) reduction can yield value-added ammonia (NH3) while removing NO2− as an environmental pollutant in wastewater; however, it involves a six-electron transfer process and requires highly efficient and selective electrocatalysts. In this study, we report high-efficiency el...

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Bibliographic Details
Published in:Inorganic chemistry frontiers 2023-02, Vol.10 (5), p.1431-1435
Main Authors: Fan, Xiaoya, He, Xun, Ji, Xianchang, Zhang, Longcheng, Li, Jun, Hu, Long, Li, Xiuhong, Sun, Shengjun, Zheng, Dongdong, Luo, Yongsong, Wang, Yan, Xie, Lisi, Liu, Qian, Binwu Ying, Sun, Xuping
Format: Article
Language:English
Subjects:
Ammonia
Arrays
Efficiency
Electrocatalysts
Electrolysis
Electron transfer
Inorganic chemistry
Metal plates
Nanoparticles
Nanoribbons
Nitrogen dioxide
Silver
Titanium dioxide
Wastewater
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Summary:Electrochemical nitrite (NO2−) reduction can yield value-added ammonia (NH3) while removing NO2− as an environmental pollutant in wastewater; however, it involves a six-electron transfer process and requires highly efficient and selective electrocatalysts. In this study, we report high-efficiency electrosynthesis of NH3via NO2− reduction enabled by an Ag nanoparticle-decorated TiO2 nanoribbon array on a titanium plate (Ag@TiO2/TP). When tested in 0.1 M NaOH containing 0.1 M NO2−, such Ag@TiO2/TP shows a large NH3 yield of 514.3 μmol h−1 cm−2 and a high faradaic efficiency of 96.4% at −0.5 V vs. a reversible hydrogen electrode. Significantly, it also demonstrates excellent durability for 12 h electrolysis.
ISSN:2052-1545
2052-1553
DOI:10.1039/d2qi02409h