Citation: 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. doi: S1872-2067(19)63470-4 shu

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

a Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
b School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China;
c School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China

Received Date: 23 June 2019
Revised Date: 9 August 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (51672312, 21373275) and the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities (CZT19006).

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.
- TiO₂ nanofiber,
- Electrospinning,
- Photocatalytic oxidation,
- Acetone,
- Dye-sensitized solar cell
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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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通讯作者: 陈斌, bchen63@163.com

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