An In Situ Simultaneous Reduction-Hydrolysis Technique for Fabrication of TiO2-Graphene 2D Sandwich-Like Hybrid Nanosheets: Graphene-Promoted Selectivity of Photocatalytic-Driven Hydrogenation and Coupling of CO2 into Methane and Ethane

Authors

  • Wenguang Tu,

    1. Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China
    2. School of Physics, Nanjing University, Nanjing 210093, P. R. China
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  • Yong Zhou,

    Corresponding author
    1. Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China
    2. School of Physics, Nanjing University, Nanjing 210093, P. R. China
    3. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
    • Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China.
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  • Qi Liu,

    1. Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China
    2. Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, P. R. China
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  • Shicheng Yan,

    1. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
    2. Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, P. R. China
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  • Shanshan Bao,

    1. School of Physics, Nanjing University, Nanjing 210093, P. R. China
    2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
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  • Xiaoyong Wang,

    1. School of Physics, Nanjing University, Nanjing 210093, P. R. China
    2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
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  • Min Xiao,

    1. School of Physics, Nanjing University, Nanjing 210093, P. R. China
    2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
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  • Zhigang Zou

    Corresponding author
    1. Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China
    2. School of Physics, Nanjing University, Nanjing 210093, P. R. China
    3. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P. R. China
    4. Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, P. R. China
    • Eco-materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing 210093, P. R. China.
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Abstract

A novel, in situ simultaneous reduction-hydrolysis technique (SRH) is developed for fabrication of TiO2--graphene hybrid nanosheets in a binary ethylenediamine (En)/H2O solvent. The SRH technique is based on the mechanism of the simultaneous reduction of graphene oxide (GO) into graphene by En and the formation of TiO2 nanoparticles through hydrolysis of titanium (IV) (ammonium lactato) dihydroxybis, subsequently in situ loading onto graphene through chemical bonds (Ti–O–C bond) to form 2D sandwich-like nanostructure. The dispersion of TiO2 hinders the collapse and restacking of exfoliated sheets of graphene during reduction process. In contrast with prevenient G-TiO2 nanocomposites, abundant Ti3+ is detected on the surface of TiO2 of the present hybrid, caused by reducing agent En. The Ti3+ sites on the surface can serve as sites for trapping photogenerated electrons to prevent recombination of electron–hole pairs. The high photocatalytic activity of G-TiO2 hybrid is confirmed by photocatalytic conversion of CO2 to valuable hydrocarbons (CH4 and C2H6) in the presence of water vapor. The synergistic effect of the surface-Ti3+ sites and graphene favors the generation of C2H6, and the yield of the C2H6 increases with the content of incorporated graphene. The work may open a new doorway for new significant application of graphene for selectively catalytic C–C coupling reaction

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