Three-dimensional titanium dioxide/graphene hybrids with improved performance for photocatalysis and energy storage
Abstract A series of three-dimensional (3-D) TiO 2 /graphene (TiO 2 /GR) hybrids with different TiO 2 weight ratios were prepared using a self-assembly approach followed by the gaseous reduction in a hydrothermal system. The method was based on the electrostatic attraction between the positively charged titanium glycolate precursor and negatively charged graphene oxide in an aqueous medium without any surfactant or template. The structure, morphology, physical and optical properties of the as-synthesized hybrids were characterized, and the results showed that TiO 2 spheres were homogeneously confined within the 3-D networks of graphene, and acted as pillars to effectively separate the graphene sheets from each other. By optimizing the ratio of TiO 2 in the hybrids, the material was identified as an excellent photocatalyst to remove organic compound in water with high degradation efficiency. Additionally, TiO 2 /GR hybrids delivered high specific capacity, enhanced rate capability and excellent cyclic stability when used as a freestanding electrode for lithium ion batteries. Graphical abstract Three-dimensional TiO 2 /graphene hybrids were prepared by using a self-assembly approach followed by the gaseous reduction in a hydrothermal system. With optimized ratio of TiO 2 in the hybrids, the material exhibited a highly photonic activity, a high rate capability and stable cyclic performance for lithium ion batteries. [DISPLAY OMISSION]
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