Journal
ADVANCED SCIENCE
Volume 5, Issue 6, Pages -Publisher
WILEY
DOI: 10.1002/advs.201700870
Keywords
carbon; doping; MXenes; photocatalytic materials; TiO2
Categories
Funding
- National Natural Science Foundation of China [51302220, 51672218, 51632007]
- Northwestern Polytechnical University (NWPU) Foundation for Fundamental Research [3102015ZY086]
- Projects from Science and Technology Committee of Shaanxi Province [2014KW09-03]
- fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201613]
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TiO2 is an ideal photocatalyst candidate except for its large bandgap and fast charge recombination. A novel laminated junction composed of defect-controlled and sulfur-doped TiO2 with carbon substrate (LDC-S-TiO2/C) is synthesized using the 2D transition metal carbides (MXenes) as a template to enhance light absorption and improve charge separation. The prepared LDC-S-TiO2/C catalyst delivers a high photocatalytic H-2 evolution rate of 333 mu mol g(-1) h(-1) with a high apparent quantum yield of 7.36% at 400 nm and it is also active even at 600 nm, resulting into a 48 time activity compared with L-TiO2/C under visible light irradiation. Further theoretical modeling calculation indicates that such novel approach also reduces activation energy of hydrogen production apart from broadening the absorption wavelength, facilitating charge separation, and creating a large surface area substrate. This synergic effect can also be applied to other photocatalysts' modification. The study provides a novel approach for synthesis defective metal oxides based hybrids and broaden the applications of MXene family.
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