Growth of narrow-bandgap Cl-doped carbon nitride nanofibers on carbon nitride nanosheets for high-efficiency photocatalytic H2O2 generation |
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| Authors: | Tingshuo Ji Yanzhen Guo Huili Liu Binbin Chang Xuefeng Wei Baocheng Yang |
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| Institution: | College of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang 471023 PR China ; Henan Provincial Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006 China, |
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| Abstract: | Heterojunction construction has been proved to be an effective way to enhance photocatalysis performance. In this work, Cl-doped carbon nitride nanofibers (Cl–CNF) with broadband light harvesting capacity were in situ grown on carbon nitride nanosheets (CNS) by a facile hydrothermal method to construct a type II heterojunction. Benefiting from the joint effect of the improved charge carriers separation efficiency and a broadened visible light absorption range, the optimal heterostructure of Cl–CNF/CNS exhibits a H2O2 evolution rate of 247.5 μmol g−1 h−1 under visible light irradiation, which is 3.4 and 3.1 times as much as those of Cl–CNF (72.2 μmol g−1 h−1) and CNS (80.2 μmol g−1 h−1), respectively. Particularly, the heterojunction nanostructure displays an apparent quantum efficiency of 23.67% at 420 nm. Photoluminescence spectra and photocurrent measurements both verified the enhanced charge carriers separation ability. Our work provides a green and environmentally friendly strategy for H2O2 production by elaborate nanostructure design.The Cl-CNF/CNS heterostructure can efficiently boost the photocatalytic H2O2 generation activity. |
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