Fabrication of TiO2 nanofiber assembly from nanosheets (TiO2-NFs-NSs) by electrospinning-hydrothermal method for improved photoreactivity

doi:10.1016/S1872-2067(19)63470-4

Abstract

Abstract: Hierarchically structured nanomaterials have attracted much attention owing to their unique properties. In this study, TiO₂ nanofibers assembled from nanosheets (TiO₂-NFs-NSs) were fabricated through electrospinning technique, which was followed by hydrothermal treatment in NaOH solution. The effect of hydrothermal reaction time (0-3 h) on the structure and properties of TiO₂ nanofibers (TiO₂-NFs) was systematically studied, and TiO₂-NFs was evaluated in terms of the photocatalytic activity toward photocatalytic oxidation of acetone and the photoelectric conversion efficiency of dye-sensitized solar cells. It was found that (1) hydrothermal treatment of TiO₂-NFs in NaOH solution followed by acid washing and calcination results in the formation of TiO₂-NFs-NSs; (2) upon extending the hydrothermal reaction time from 0 h to 3 h, the BET surface area of TiO₂-NFs-NSs (T3.0 sample) increases 3.8 times (from 28 to 106 m² g^-1), while the pore volume increases 6.0 times (from 0.09 to 0.54 cm³ g^-1); (3) when compared with those of pristine TiO₂-NFs (T0 sample), the photoreactivity of the optimized TiO₂-NFs-NSs toward acetone oxidation increases 3.1 times and the photoelectric conversion efficiency increases 2.3 times. The enhanced photoreactivity of TiO₂-NFs-NSs is attributed to the enlarged BET surface area and increased pore volume, which facilitate the adsorption of substrate and penetration of gas, and the unique hollow structure of TiO₂-NFs-NSs, which facilitates light harvesting through multiple optical reflections between the TiO₂ nanosheets.

Key words: TiO₂ nanofiber, Electrospinning, Photocatalytic oxidation, Acetone, Dye-sensitized solar cell

Yachao Lu, Xiaoyu Ou, Wenguang Wang, Jiajie Fan, Kangle Lv. Fabrication of TiO₂ nanofiber assembly from nanosheets (TiO₂-NFs-NSs) by electrospinning-hydrothermal method for improved photoreactivity[J]. Chinese Journal of Catalysis, 2020, 41(1): 209-218.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63470-4

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Fabrication of TiO₂ nanofiber assembly from nanosheets (TiO₂-NFs-NSs) by electrospinning-hydrothermal method for improved photoreactivity

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