Journal
DIAMOND AND RELATED MATERIALS
Volume 116, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108242
Keywords
CQDs; g-C3N4; Photocatalysis; H-2 evolution; DFT calculation
Categories
Funding
- Natural Science Foundation of Fujian Province [2020J01023]
- Science and Technology Project of Xiamen City [3502Z20183009]
- National Key Research and Development Program [2019YFC1805801]
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In this study, carbon quantum dots (CQDs) functionalized graphitic carbon nitride (g-C3N4) composite material (CCN) was prepared via a simple thermal polymerization method, leading to enhanced catalytic activity under visible light irradiation. The increased separation and transfer efficiencies of photogenerated charges were attributed to the micro-regional heterostructure of CQDs and g-C3N4, resulting in a significant increase in the hydrogen production rate.
Graphitic carbon nitride (g-C3N4) is a representative photocatalyst, but the photocatalytic activity is often limited because of the easy recombination and slow migration of photogenerated charges. Herein, we have successfully prepared carbon quantum dots (CQDs) functionalized g-C3N4 (CCN) by a simple thermal polymerization method. Besides, the CQDs serving as a photosensitizer can enlarge the absorption range of visible light of the composite material. As a result, under the irradiation of visible light, the optimized CCN showed superior catalytic activity with a high H-2 production rate of 2321 mu mol.g(-1).h(-1), which was almost about 7.4 times higher than that of bulk g-C3N4. Based on the systematic characterization and density functional theory (DFT) calculation, it was proved that the efficiencies of the separation and transfer of photogenerated charges were enhanced by the micro-regional heterostructure of CQDs and g-C3N4.
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