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Dataset on the effect of sodium sources on the morphology, crystallite size and carbon content of NaTi2(po4)3/c composite prepared by an in situ process.

ABSTRACT: The data presented in this manuscript showed the effects of the sodium sources on the morphology, crystallite size and carbon content of NaTi2(PO4)3/C composite obtained after heat treatment under N2 atmosphere of the as-spraydried powders. The morphology, crystalline size and carbon content of three products with different sodium sources were investigated.The data are related to “Synthesis of NaTi2(PO4)3@C microspheres by an in situ process and their electrochemical properties” (Mao et al.,2020).

SUBMITTER: Ding Y

PROVIDER: S-EPMC7334292 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Project description:Oriented self-assembly between inorganic nanocrystals and surfactants is emerging as a route for obtaining new mesocrystalline semiconductors. However, the actual synthesis of mesoporous semiconductor mesocrystals with abundant surface sites is extremely difficult, and the corresponding new physical and chemical properties arising from such an intrinsic porous mesocrystalline nature, which is of fundamental importance for designing high-efficiency nanostructured devices, have been rarely explored and poorly understood. Herein, we report a simple evaporation-driven oriented assembly method to grow unprecedented olive-shaped mesoporous TiO2 mesocrystals (FDU-19) self-organized by ultrathin flake-like anatase nanocrystals (?8 nm in thickness). The mesoporous mesocrystals FDU-19 exhibit an ultrahigh surface area (?189 m(2)/g), large internal pore volume (0.56 cm(3)/g), and abundant defects (oxygen vacancies or unsaturated Ti(3+) sites), inducing remarkable crystallite-interface reactivity. It is found that the mesocrystals FDU-19 can be easily fused in situ into mesoporous anatase single crystals (SC-FDU-19) by annealing in air. More significantly, by annealing in a vacuum (?4.0 × 10(-5) Pa), the mesocrystals experience an abrupt three-dimensional to two-dimensional structural transformation to form ultrathin anatase single-crystal nanosheets (NS-FDU-19, ?8 nm in thickness) dominated by nearly 90% exposed reactive (001) facets. The balance between attraction and electrostatic repulsion is proposed to determine the resulting geometry and dimensionality. Dye-sensitized solar cells based on FDU-19 and SC-FDU-19 samples show ultrahigh photoconversion efficiencies of up to 11.6% and 11.3%, respectively, which are largely attributed to their intrinsic single-crystal nature as well as high porosity. This work gives new understanding of physical and chemical properties of mesoporous semiconductor mesocrystals and opens up a new pathway for designing various single-crystal semiconductors with desired mesostructures for applications in catalysis, sensors, drug delivery, optical devices, etc.

Dataset Information

Dataset on the effect of sodium sources on the morphology, crystallite size and carbon content of NaTi2(po4)3/c composite prepared by an in situ process.

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