Abstract
Single-crystalline TiO2 nanorod arrays (TiO2 NRAs) with dominant {001} facets sensitized with CdS nanosheets were prepared on fluorine-doped tin oxide (FTO) substrate by a simple combination of hydrothermal and successive ion layer absorption and reaction (SILAR) methods. The amount of CdS nanosheets was controlled by changing reaction time (0, 2, 6, and 10 min) in SILAR process. The effects of SILAR time on the microstructure, morphology, and optical and photoelectrochemical properties of TiO2 NRAs were investigated. Changing of SILRA times are accompanied by significant variations of optical properties including a decrease of the band gap from 2.98 to 2.41 eV and a red absorption peak shift from ultraviolet to visible region. Notably, the photoelectrochemical performance of TiO2 NRAs after 6 min SILAR deposition of CdS nonosheets improved significantly, displaying an optimal photocurrent density of 1.5 mA cm−2, which is about 15 times higher than that of pure TiO2 NRAs. This enhanced photoelectrochemical properties due to the synergistic effect of CdS nanosheets and rutile TiO2 NRAs with highly reactive {001} facets.
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Acknowledgements
This work was supported by the PHD Science Research Initiation Foundation of Anhui Jianzhu University (2016QD115) and key projects of domestic and foreign research and training of outstanding young and middle-aged backbone talents in Universities in Anhui Province (gxfxZD2016133).
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Highlights
1. TiO2 nanorod arrays with dominant {001} facets decorated with CdS nanosheets were synthesized
2. The amount of CdS was controlled by changing reaction time in SILAR process
3. The TiO2 sensitized by CdS increase the visible-light absorption compared with the bare TiO2
4. The photoelectrochemical performance of TiO2 after 6 min SILAR deposition of CdS improved significantly, which is about 15 times higher than that of pristine TiO2
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Wang, G., Zheng, C. & Zhou, W. Enhanced optical and photoelectrochemical performance of single-crystalline TiO2 nanorod arrays with exposed {001} facets sensitized with CdS nanosheets. Ionics 24, 1537–1544 (2018). https://doi.org/10.1007/s11581-017-2301-9
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DOI: https://doi.org/10.1007/s11581-017-2301-9