期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 17, 页码 5878-5888出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.03.028
关键词
Ag-doping; BiVO4; Photocatalytic hydrogen production; Monoclinic/tetragonal heterostructure
资金
- National Natural Science Foundation of China [21276190, 20806059]
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 H-2 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 mu mol 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. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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