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One-step synthesis of nonstoichiometric TiO2 nanorods films for enhanced photocatalytic H2 evolution

Abstract

The realization of one-dimensional nanostructures or Ti3+ self-doping in TiO2 photocatalysts has proven to be an effective approach for significantly improving the photocatalytic performance. Herein, a series of nonstoichiometric anatase TiO2 nanorods films were deposited at 50-500 oC by a facile one-step magnetron sputtering method. The correlation between the microstructures and the photocatalytic H2 production abilities of the films was studied. It is found that, with increasing of the deposition temperature, the as-sputtered TiO2 grains transformed from quasi-spherical to rod-like while the concentration of Ti3+ species decreased gradually. Thus, by virtue of the collaboration between nanostructure engineering and defect engineering, the sample deposited at 300 oC behaved the maximum H2 generation rate of 1874 μmol m-2 h-1, about 134 times higher than that of Degussa P25 powder film (14 μmol m-2 h-1). Furthermore, the stoichiometric TiO2 shell forming on the surface of TiO2 nanograins protected the defective TiO2-x core from further oxidation, resulting in the excellent photocatalytic stability of the films. The possible film growth and photocatalytic reaction mechanisms over Ti3+ doped TiO2 nanorods film has been investigated. Our work provides a facile route to fabricating a high-efficiency defect-based TiO2 or the other transition metal oxide nanostructures with controlled morphology for solar energy conversion.

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Publication details

The article was received on 07 Jan 2018, accepted on 13 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C8DT00066B
Citation: Dalton Trans., 2018, Accepted Manuscript
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    One-step synthesis of nonstoichiometric TiO2 nanorods films for enhanced photocatalytic H2 evolution

    Q. Hu, J. Li, Q. Li, G. Wang, J. Huang and X. Huang, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00066B

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