Fabrication of MgFe2O4/MoS2 Heterostructure Nanowires for Photoelectrochemical Catalysis

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• 作者：Weiqiang Fan ; Meng Li ; Hongye Bai ; Dongbo Xu ; Chao Chen ; Chunfa Li ; Yilin Ge ; Weidong Shi
• 刊名：Langmuir
• 出版年：2016
• 出版时间：February 16, 2016
• 年：2016
• 卷：32
• 期：6
• 页码：1629-1636
• 全文大小：551K
• ISSN：1520-5827

文摘

A novel one-dimensional MgFe₂O₄/MoS₂ heterostructure has been successfully designed and fabricated. The bare MgFe₂O₄ was obtained as uniform nanowires through electrospinning, and MoS₂ thin film appeared on the surface of MgFe₂O₄ after further chemical vapor deposition. The structure of the MgFe₂O₄/MoS₂ heterostructure was systematic investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectrometry (XPS), and Raman spectra. According to electrochemical impedance spectroscopy (EIS) results, the MgFe₂O₄/MoS₂ heterostructure showed a lower charge-transfer resistance compared with bare MgFe₂O₄, which indicated that the MoS₂ played an important role in the enhancement of electron/hole mobility. MgFe₂O₄/MoS₂ heterostructure can efficiently degrade tetracycline (TC), since the superoxide free-radical can be produced by sample under illumination due to the active species trapping and electron spin resonance (ESR) measurement, and the optimal photoelectrochemical degradation rate of TC can be achieved up to 92% (radiation intensity: 47 mW/cm², 2 h). Taking account of its unique semiconductor band gap structure, MgFe₂O₄/MoS₂ can also be used as an photoelectrochemical anode for hydrogen production by water splitting, and the hydrogen production rate of MgFe₂O₄/MoS₂ was 5.8 mmol/h·m² (radiation intensity: 47 mW/cm²), which is about 1.7 times that of MgFe₂O₄.