Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 547, Issue -, Pages 224-233Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.03.106
Keywords
mg-C3N4; Spatial anisotropic; PHE; Precursor-reforming; Charge carriers
Categories
Funding
- National Natural Science Foundation of China [21805115, 21576112, 21606114]
- NSFC-Shanxi Coal Based Low Carbon Joint Fund [U1810117]
- Natural Science Foundation of Jiangsu Province [BK20150536]
- Postdoctoral Science Foundation of China [2017M611712, 2017M611717]
- Jiangsu Planned Projects for postdoctoral Research Funds [1701025A]
- Scientific Research Foundation for Senior Talent of Jiangsu University [17JDG020]
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Precursor-reforming strategy induced graphitic carbon nitride (g-C3N4) with different morphologies for enhanced photocatalytic hydrogen (H-2) evolution activity is highly desirable. Herein, g-C3N4 microtubes (mg-C3N4) with adjustable closure degree of microtube orifice and spatial anisotropic charge separation are established by conquering hydrogen bond during thermally exfoliate precursor. Compared to the bulk g-C3N4 (bg-C3N4) and ultrathin g-C3N4 (ug-C3N4), the tubular structure endows mg-C3N4 with spatial anisotropic charge separation that accelerates transfer of charge carriers. As expected, the photocatalytic H-2 evolution (PHE) activity of mg-C3N4 has been obviously enhanced. Particularly, the mg-C3N4-24 shows the best PHE activity (957.9 mu mol h(-1) g(-1)), which is over 18.72 and 3.77 times higher than the bg-C3N4 and ug-C3N4, respectively. In addition, selective photo-deposition experiment results reveal a charge carriers migration behavior that photoproduction electrons migrate to the outer shell and holes prefer to move onto the inner shell of mg-C3N4, thus achieving efficient spatial anisotropic charge separation. We firmly believe that the work presents significant advancement for the design of other materials by precursor-reforming strategy. (C) 2019 Published by Elsevier Inc.
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