کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1275433 | 1497456 | 2015 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The effects of Ag doping on crystalline structure and photocatalytic properties of BiVO4 The effects of Ag doping on crystalline structure and photocatalytic properties of BiVO4](/preview/png/1275433.png)
• The effects of Ag doping on morphology and structure of BiVO4 were investigated.
• The ratio of Monoclinic/tetragonal phase can be adjusted by Ag addition amount.
• 4% wt.% Ag-doped BiVO4 exhibits the highest photo catalytic activity.
BiVO4 and Ag-doped BiVO4 were hydrothermal synthesized and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction, Raman, X-ray photoelectron spectroscopy (XPS), UV–Vis diffusion reflectance spectroscopy and room-temperature photoluminescence spectra (PL) and photoelectron-chemical measurement. The structural and morphological characterizations reveal that the Ag species, existing as Ag4V2O7 phase, has a significant influence on the morphology and induces a progressive conversion of monoclinic to tetragonal BiVO4. The as-prepared Ag-doped BiVO4 composites exhibit much higher photocatalytic activities for H2 evolution from the ethanol-triethylamine aqueous solution as compared to bare BiVO4. The 4 wt.% Ag-doped BiVO4 possesses the highest photocatalytic activity, and hydrogen production rate of 205 μmol h−1·g−1 can be obtained. The highly improved performance can be attributed to the efficient charge transfer and separation from the coupling effect of Ag4V2O7 semiconductor and monoclinic/tetragonal heterostructured BiVO4 system.
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 17, 11 May 2015, Pages 5878–5888