期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 721, 期 -, 页码 36-44出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.05.301
关键词
Hierarchical porous; Graphene quantum dots; Photocatalyst; TiO2
资金
- Iran National Science Foundation (Research Chair Award of Surface and Interface'Physics) [940009]
- Research and Technology Council of the Sharif University of Technology
In this study, initially graphene quantum dots (GQDs) were synthesized by an electrochemical technique and hierarchical porous TiO2 were made by a sol gel method. Subsequently, GQDs/hierarchical porous TiO2 nanocomposites were prepared by two different methods for the purpose of comparison: spin coating (SC) and electrophoretic (EP) deposition. The GQDs/hierarchical porous TiO2 nanocomposites were characterized by various analytical methods including field emission scanning electron microscopy, atomic force microscopy, transmission electron microscopy, high resolution transmission electron microscopy, Fourier transform infra-red spectroscopy, photoluminescence spectroscopy and ultraviolet visible spectroscopy. Under visible light irradiation, photoanodes made of the hierarchical porous TiO2, EP-GQDs/hierarchical porous TiO2 and SC-GQDs/hierarchical porous TiO2 nanocomposite produced the photocurrent densities of about 1.86, 3.29 and 6.35 A/m(2), respectively. The results showed that the nanocomposites prepared by the SC technique exhibit a higher photoelectrochemical (PEC) activity as compared to both the EP deposited composite and the pure hierarchical porous TiO2. Finally, the photoenhancement was described based on a charge transfer mechanism. (C) 2017 Elsevier B.V. All rights reserved.
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