Journal
APPLIED SURFACE SCIENCE
Volume 480, Issue -, Pages 810-816Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.03.028
Keywords
Carbon quantum dots; TiO2; (001) facet; Photocatalytic H-2 evolution
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Funding
- Canadian Centre for Clean Coal/Carbon and Mineral Processing Technologies (C5MPT)
- China Scholarship Council (CSC)
- China Postdoctoral Science Foundation [2018M642310]
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Carbon quantum dots/TiO2 nanosheets with a majority of (001) facet (CQDs/TiO2-001) samples are successfully prepared via a facile method. Compared to TiO2-001 and CQDs/P25, the synthesized CQDs/TiO2-001 presents a remarkably higher photocatalytic activity for H-2 evolution with a considerable stability. XRD, XPS, HRTEM, FESEM, FTIR, Photoluminescence (PL) spectroscopy, Fluorescence spectroscopy and UV-visible reflectance spectroscopy are adopted to investigate the morphology, structure and properties of synthesized CQDs/TiO2-001. The mechanism of the improved photocatalytic activity over CQDs/TiO2-001 is also investigated. The results show that the improved photocatalytic activity over CQDs/TiO2-001 can be attributed to the synergistic effects of TiO2-001 and CQDs: the highly exposed (001) facets of TiO2-001 promote the transportation of photogenerated electrons and the loading of CQDs restrains the recombination of electrons-holes on (001) facets. Meanwhile, the visible-light absorption is extended because the CQDs serve as a photosensitizer and sensitize TiO2-001 through the newly formed Ti-O-C bond between the CQDs and TiO2-001.
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