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Photocatalytic Synthesis of Ammonia over Fe2O3/ZnO with Rich Surface Oxygen Vacancy
Author NameAffiliationE-mail
CHEN Qi College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China  
ZHOU Yu College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China  
ZHU Ji-Xiu College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China  
LIANG Tian-Tian College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China  
HUANG Rong-Bin College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China huangrb@zjut.edu.cn 
CHEN Ai-Min College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China amchen@zjut.edu.cn 
Abstract: 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.
Keywords: photocatalytic synthesis of ammonia  zinc oxide  oxygen vacancy  heterojunction  iron oxide
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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.
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Chinese Journal of Inorganic Chemistry