Citation: CHEN Qi, ZHOU Yu, ZHU Ji-Xiu, LIANG Tian-Tian, HUANG Rong-Bin, CHEN Ai-Min. Photocatalytic Synthesis of Ammonia over Fe₂O₃/ZnO with Rich Surface Oxygen Vacancy[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(3): 426-434. doi: 10.11862/CJIC.2020.063 shu

Photocatalytic Synthesis of Ammonia over Fe₂O₃/ZnO with Rich Surface Oxygen Vacancy

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Corresponding author: HUANG Rong-Bin, huangrb@zjut.edu.cn CHEN Ai-Min, amchen@zjut.edu.cn
Received Date: 17 August 2019
Revised Date: 3 December 2019

Figures(13)

Photocatalytic synthesis of ammonia is a sustainable and energy-saving synthetic ammonia technology. Rich oxygen vacancies and heterostructures are important to increase the photocatalytic nitrogen to ammonia. We synthesized Fe₂O₃/ZnO nanocomposites by solvothermal method using ethylene glycol as the reducing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR), UV-Vis DRS, photoluminescence (PL) and photocurrent (PC) were used to characterize the Fe₂O₃/ZnO catalysts. The performance of photocatalytic synthesis of ammonia by Fe₂O₃/ZnO catalysts was tested at room temperature. The results show that heterostructure was formed between ZnO nanorods and Fe₂O₃ nanoparticles while abundant surface oxygen vacancies were produced over the Fe₂O₃/ZnO catalysts. Fe₂O₃ nanoparticles not only provide rich N₂ chemical adsorption sites, but also promote the light absorption of ZnO in the visible region. The introduction of Fe₂O₃ reduces the concentration of bulk oxygen vacancies and inhibits the recombination of photogenerated electrons and holes. The 4%Fe₂O₃/ZnO catalyst exhibited enhanced photocatalytic nitrogen fixation efficiency with a NH₃ rate of 2 059 μmol·L^-1·g^-1·h^-1 with better stability. The high catalytic efficiency is attributed to the enhancement of visible light absorption, the activation of nitrogen molecules on surface oxygen vacancies and Fe³⁺ active sites, and the high separation efficiency of photogenerated electrons and holes.
- photocatalytic synthesis of ammonia,
- zinc oxide,
- oxygen vacancy,
- heterojunction,
- iron oxide
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Photocatalytic Synthesis of Ammonia over Fe2O3/ZnO with Rich Surface Oxygen Vacancy

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通讯作者: 陈斌, bchen63@163.com

Photocatalytic Synthesis of Ammonia over Fe₂O₃/ZnO with Rich Surface Oxygen Vacancy