尿素
合金
纳米晶
材料科学
化学
化学工程
纳米技术
有机化学
冶金
工程类
作者
Yulong Zhou,Baopeng Yang,Zhencong Huang,Gen Chen,Jianguo Tang,Min Liu,Xiaohe Liu,Renzhi Ma,Zongwei Mei,Ning Zhang
标识
DOI:10.1016/j.apcatb.2023.123577
摘要
Electrocatalytic urea synthesis from CO2 and NO3− are environmental green and energy savable. Although Cu are effective for CO2 and NO3− reduction reactions, achieving high efficiency of urea production remains challenging. Herein, Cu-Ni nanocrystals are formed to provide heterogenous active sites for promoting hydrogenation and C−N coupling reactions in urea synthesis. The carbon supported Cu-Ni nanocrystals are characterized by extended X-ray absorption fine structure and X-ray photoelectron spectroscopy spectra. The Cu-Ni nanocrystals achieves the highest urea Faradaic efficiency of 25.1 % and urea yield of 22.01 μmol h−1 cm−1, which is much higher than that of single Cu or Ni metal. The reaction mechanism is probed by in-situ Fourier transform infrared spectroscopy, revealing a C−N coupling reaction pathway between *CO and *NH2. Theoretical calculations suggest that hydrogenation of *NOx and coupling *CO with *NH2 are more easily occurred over co-existed Cu and Ni sites rather than homogeneous Cu or Ni site.
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