Controllable synthesis of porous TiO2 with a hierarchical nanostructure for efficient photocatalytic hydrogen evolution

Lin Wang; Zhongyuan Nie; Chuanbao Cao; Muwei Ji; Li Zhou; Xiao Feng

doi:10.1039/c4ta04182h

Controllable synthesis of porous TiO₂ with a hierarchical nanostructure for efficient photocatalytic hydrogen evolution

Lin Wang, Zhongyuan Nie, Chuanbao Cao^*, Muwei Ji, Li Zhou, Xiao Feng

^*Corresponding author for this work

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

TiO₂ has been the most suitable candidate for commercial scale-up photocatalysts to date. However, the practical application of TiO₂ has been limited, due to its wide band gap (3.0 eV for rutile and 3.2 eV for anatase) and recombination of photoinduced charges. Herein, we report a simple and effective approach to resolve the limitations by manipulating the structure and size of TiO₂ to improve the photocatalytic efficiency. By adjusting the volume ratio of hydrochloric acid (HCl) and ethylene glycol (EG), porous TiO₂ hierarchical microspheres with controllable size of nanorods were obtained. The nanorods were several hundreds of nanometers long with different average widths, including 5 (TiO₂-5), 10 (TiO₂-10) and 15 nm (TiO₂-15). The band gap of TiO₂-5 was as low as 2.75 eV with a super large BET surface area of 216.607 m² g^-1. The rate of photocatalytic hydrogen generation for TiO₂-5 was 23.74 mmol g^-1 h^-1 under UV-visible light irradiation of 200 mW cm^-2.

Original language	English
Pages (from-to)	3710-3718
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	7
DOIs	https://doi.org/10.1039/c4ta04182h
Publication status	Published - 21 Feb 2015

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title = "Controllable synthesis of porous TiO2 with a hierarchical nanostructure for efficient photocatalytic hydrogen evolution",

abstract = "TiO2 has been the most suitable candidate for commercial scale-up photocatalysts to date. However, the practical application of TiO2 has been limited, due to its wide band gap (3.0 eV for rutile and 3.2 eV for anatase) and recombination of photoinduced charges. Herein, we report a simple and effective approach to resolve the limitations by manipulating the structure and size of TiO2 to improve the photocatalytic efficiency. By adjusting the volume ratio of hydrochloric acid (HCl) and ethylene glycol (EG), porous TiO2 hierarchical microspheres with controllable size of nanorods were obtained. The nanorods were several hundreds of nanometers long with different average widths, including 5 (TiO2-5), 10 (TiO2-10) and 15 nm (TiO2-15). The band gap of TiO2-5 was as low as 2.75 eV with a super large BET surface area of 216.607 m2 g-1. The rate of photocatalytic hydrogen generation for TiO2-5 was 23.74 mmol g-1 h-1 under UV-visible light irradiation of 200 mW cm-2.",

author = "Lin Wang and Zhongyuan Nie and Chuanbao Cao and Muwei Ji and Li Zhou and Xiao Feng",

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T1 - Controllable synthesis of porous TiO2 with a hierarchical nanostructure for efficient photocatalytic hydrogen evolution

AU - Wang, Lin

AU - Nie, Zhongyuan

AU - Cao, Chuanbao

AU - Ji, Muwei

AU - Zhou, Li

AU - Feng, Xiao

PY - 2015/2/21

Y1 - 2015/2/21

N2 - TiO2 has been the most suitable candidate for commercial scale-up photocatalysts to date. However, the practical application of TiO2 has been limited, due to its wide band gap (3.0 eV for rutile and 3.2 eV for anatase) and recombination of photoinduced charges. Herein, we report a simple and effective approach to resolve the limitations by manipulating the structure and size of TiO2 to improve the photocatalytic efficiency. By adjusting the volume ratio of hydrochloric acid (HCl) and ethylene glycol (EG), porous TiO2 hierarchical microspheres with controllable size of nanorods were obtained. The nanorods were several hundreds of nanometers long with different average widths, including 5 (TiO2-5), 10 (TiO2-10) and 15 nm (TiO2-15). The band gap of TiO2-5 was as low as 2.75 eV with a super large BET surface area of 216.607 m2 g-1. The rate of photocatalytic hydrogen generation for TiO2-5 was 23.74 mmol g-1 h-1 under UV-visible light irradiation of 200 mW cm-2.

AB - TiO2 has been the most suitable candidate for commercial scale-up photocatalysts to date. However, the practical application of TiO2 has been limited, due to its wide band gap (3.0 eV for rutile and 3.2 eV for anatase) and recombination of photoinduced charges. Herein, we report a simple and effective approach to resolve the limitations by manipulating the structure and size of TiO2 to improve the photocatalytic efficiency. By adjusting the volume ratio of hydrochloric acid (HCl) and ethylene glycol (EG), porous TiO2 hierarchical microspheres with controllable size of nanorods were obtained. The nanorods were several hundreds of nanometers long with different average widths, including 5 (TiO2-5), 10 (TiO2-10) and 15 nm (TiO2-15). The band gap of TiO2-5 was as low as 2.75 eV with a super large BET surface area of 216.607 m2 g-1. The rate of photocatalytic hydrogen generation for TiO2-5 was 23.74 mmol g-1 h-1 under UV-visible light irradiation of 200 mW cm-2.

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DO - 10.1039/c4ta04182h

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JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

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Controllable synthesis of porous TiO₂ with a hierarchical nanostructure for efficient photocatalytic hydrogen evolution

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