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Issue 39, 2013
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Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

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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.

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

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Publication details

The article was received on 14 Jun 2013, accepted on 08 Aug 2013 and first published on 13 Aug 2013


Article type: Paper
DOI: 10.1039/C3TA12329D
Citation: J. Mater. Chem. A, 2013,1, 12255-12262
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    Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

    G. Lui, J. Liao, A. Duan, Z. Zhang, M. Fowler and A. Yu, J. Mater. Chem. A, 2013, 1, 12255
    DOI: 10.1039/C3TA12329D

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