NDLI: Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

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Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

Content Provider	Semantic Scholar
Author	Lui, Gregory Liao, Jinyun Duan, Aoshu Zhang, Zisheng Fowler, Michael Yu, Aiping
Copyright Year	2013
Abstract	Graphene-wrapped titanium dioxide nanoflower composites (G–TiO2) consisting of nanosheets and nanoparticles were synthesized using a two-step solvo/hydrothermal process. Materials were characterized using SEM, TEM, high-resolution TEM (HRTEM), XRD, Raman spectroscopy, and FTIR. Further analysis was performed using Branauer–Emmett–Teller (BET) specific surface area analysis, electrochemical impedance spectroscopy (EIS), UV-Vis spectroscopy, and diffuse reflectance UV-Vis spectroscopy. Photocatalytic activity was determined by the photo-degradation of methylene blue under UV irradiation. Results show that the TiO2 nanoflower exhibits a higher photocatalytic activity than commercial P25 by a factor of 1.49. This is attributed to the highly crystalline, hierarchical nature of the nanoflower structure, which provides improved charge transport and a reduced recombination rate of photo-generated electron–hole pairs. After wrapping with graphene, the G–TiO2 composite can further improve the photocatalytic performance by providing a planar conjugated surface for dye adsorption, by further reducing recombination through accepting electrons from TiO2, and by causing a red shift in light absorption. The highest photocatalytic performance was found using a graphene loading of 5 wt%, which outperforms commercial P25 by a factor of 3.4.
Starting Page	12255
Ending Page	12262
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1039/C3TA12329D
Alternate Webpage(s)	https://uwspace.uwaterloo.ca/bitstream/handle/10012/8337/Lui_Gregory.pdf?sequence=1
Alternate Webpage(s)	https://doi.org/10.1039/C3TA12329D
Volume Number	1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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