催化作用
吸附
法拉第效率
无机化学
氨
掺杂剂
化学工程
化学
材料科学
电化学
兴奋剂
电极
物理化学
有机化学
光电子学
工程类
作者
Limin Wu,Jiaqi Feng,Li‐Bing Zhang,Shunhan Jia,Xinning Song,Qinggong Zhu,Xinchen Kang,Xueqing Xing,Xiaofu Sun,Buxing Han
标识
DOI:10.1002/anie.202307952
摘要
The renewable-energy-powered electroreduction of nitrate (NO3- ) to ammonia (NH3 ) has garnered significant interest as an eco-friendly and promising substitute for the Haber-Bosch process. However, the sluggish kinetics hinders its application at a large scale. Herein, we first calculated the N-containing species (*NO3 and *NO2 ) binding energy and the free energy of the hydrogen evolution reaction over Cu with different metal dopants, and it was shown that Zn was a promising candidate. Based on the theoretical study, we designed and synthesized Zn-doped Cu nanosheets, and the as-prepared catalysts demonstrated excellent performance in NO3- -to-NH3 . The maximum Faradaic efficiency (FE) of NH3 could reach 98.4 % with an outstanding yield rate of 5.8 mol g-1 h-1 , which is among the best results up to date. The catalyst also had excellent cycling stability. Meanwhile, it also presented a FE exceeding 90 % across a wide potential range and NO3- concentration range. Detailed experimental and theoretical studies revealed that the Zn doping could modulate intermediates adsorption strength, enhance NO2- conversion, change the *NO adsorption configuration to a bridge adsorption, and decrease the energy barrier, leading to the excellent catalytic performance for NO3- -to-NH3 .
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