硝酸盐
电化学
法拉第效率
氨
电极
材料科学
无机化学
铜
化学工程
化学
冶金
工程类
物理化学
有机化学
作者
Bocheng Zhang,Zhifeng Dai,Yanxu Chen,Mingyu Cheng,Huaikun Zhang,Pingyi Feng,Buqi Ke,Yangyang Zhang,Genqiang Zhang
标识
DOI:10.1038/s41467-024-47025-w
摘要
Abstract Nitrate can be electrochemically degraded to produce ammonia while treating sewage while it remains grand challenge to simultaneously realize high Faradaic efficiency and production rate over wide-range concentrations in real wastewater. Herein, we report the defect-rich Cu nanowire array electrode generated by in-situ electrochemical reduction, exhibiting superior performance in the electrochemical nitrate reduction reaction benefitting from the triple synergistic modulation. Notably, the defect-rich Cu nanowire array electrode delivers current density ranging from 50 to 1100 mA cm −2 across wide nitrate concentrations (1–100 mM) with Faradaic efficiency over 90%. Operando Synchrotron radiation Fourier Transform Infrared Spectroscopy and theoretical calculations revealed that the defective Cu sites can simultaneously enhance nitrate adsorption, promote water dissociation and suppress hydrogen evolution. A two-electrode system integrating nitrate reduction reaction in industrial wastewater with glycerol oxidation reaction achieves current density of 550 mA cm −2 at −1.4 V with 99.9% ammonia selectivity and 99.9% nitrate conversion with 100 h stability, demonstrating outstanding practicability.
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