电催化剂
氨生产
电解
无机化学
催化作用
电化学
化学
法拉第效率
硝酸盐
析氧
阳极
氨
反硝化
电极
氮气
有机化学
物理化学
电解质
作者
Shuaihua Zhang,Na Zhou,Jiazhi Wang,Depeng Wang,Jianrong Zeng,Haixia Zhong,Xinbo Zhang
标识
DOI:10.1002/cssc.202301050
摘要
Electrochemical nitrate reduction reaction (NO3RR) is a promising technology for ammonia production and denitrification of wastewater. Its application is seriously restricted by the development of the highly active and selective electrocatalyst and a rational electrolysis system. Here, we constructed an efficient electrochemical ammonia production process via nitrate reduction on the metallic Cu electrocatalyst when coupled with anodic sulfion oxidation reaction (SOR). The synthesized Cu catalyst delivers an excellent NH3 Faradaic efficiency of 95.6% and a NH3 yield of 0.313 mmol h‐1 cm‐2 at −0.2 V vs. reversible hydrogen electrode, which mainly stem from the more favorable conversion of NO2‐ to NH3 on Cu0. Importantly, the well‐designed electrolysis system with cathodic NO3RR and anodic SOR achieves a dramatically reduced cell voltage of 0.8 V at 50 mA cm‐2 in comparison with the one with anodic oxygen evolution reaction (OER) of 1.9 V. This work presents an effective strategy for the energy‐saving ammonia production via constructing effective nitrate reduction catalyst and replacing the OER with SOR while removing the pollutants including nitrate and sulfion.
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