润湿
氨
硝酸盐
亚硝酸盐
氨生产
氧化还原
阴极
电催化剂
催化作用
氮气
电化学
无机化学
化学工程
化学
电极
有机化学
物理化学
工程类
作者
Yonggang Xue,Qian Yu,Jinghuai Fang,Jia Yan,Rongchang Wang,Jianwei Fan
出处
期刊:Small
[Wiley]
日期:2024-03-13
被引量:1
标识
DOI:10.1002/smll.202400505
摘要
Ammonia production by electrocatalytic nitrate reduction reaction (NO3 RR) in water streams is anticipated as a zero-carbon route. Limited by dilute nitrate in natural sewage and the electrostatic repulsion between NO3- and cathode, NO3 RR can hardly be achieved energy-efficiently. The hydrophilic Cu@CuCoO2 nano-island dispersed on support can enrich NO3- and produce a sensitive current response, followed by electrosynthesis of ammonia through atomic hydrogen (*H) is reported. The accumulated NO3- can be partially converted to NO2- without external electric field input, confirming that the Cu@CuCoO2 nano-island can strongly bind NO3- and then trigger the reduction via dynamic evolution between Cu-Co redox sites. Through the identification of intermediates and theoretical computation. it is found that the N-side hydrogenation of *NO is the optimal reaction step, and the formation of N─N dimer may be prevented. An NH3 product selectivity of 93.5%, a nitrate conversion of 96.1%, and an energy consumption of 0.079 kWh gNH3-1 is obtained in 48.9 mg-N L-1 naturally nitrate-polluted streams, which outperforms many works using such dilute nitrate influent. Conclusively, the electrocatalytic system provides a platform to guarantee the self-sufficiency of dispersed ammonia production in agricultural regions.
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