Journal
CRYSTAL GROWTH & DESIGN
Volume 19, Issue 3, Pages 1680-1688Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.8b01609
Keywords
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Funding
- Natural Science Foundation of Fujian Province [2016J01083, 2016J05054]
- Chunmiao Project of Haixi Institute of Chinese Academy of Sciences [CMZX-2014-005]
- Open Foundation of Key Laboratory of Design and Assembly of Functional Nanostructures, Haixi Institute of Chinese Academy of Sciences
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Optimizing the photocatalytic activity of TiO2 for hydrogen evolution from water splitting remains a challenging task. Herein, we report the synthesis of a slightly oxygen-deficient TiO2 film consisting of anatase nanorods with mainly {110} lateral surfaces by a facile one-step technology of magnetron sputtering. The 1D nanostructure and Ti3+/oxygen vacancies in the as-prepared TiO2 film are advantageous for the inhibition of recombination of electron-hole pairs, while the exposed {110} lateral surfaces provide abundant surface active sites; as a result, this TiO2 exhibited an ultrahigh photocatalytic activity for water splitting. Remarkably, photocatalytic overall water splitting into H-2 and O-2 simultaneously with a ratio close to 2:1 has been realized for the first time over pristine anatase TiO2 without the assistance of sacrificial electron donor and cocatalyst. Additionally, in the presence of methanol as a sacrificial agent, the pristine TiO2 displayed a high apparent quantum efficiency of similar to 21.4% at 365 nm and the hydrogen generation rate under the full-arc light irradiation could be as high as 14.35 mmol m(-2) h(-1), which is about 3 orders of magnitude higher than that of P25 film (similar to 0.014 mmol m(-2) h(-1)). This result provides a facile pathway to synthesizing defect-based metal oxide with optimal facets and morphology for high-efficiency energy conversion.
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