Abstract
Graphitic carbon nitride (g-C3N4) is a two-dimensional (2D) photocatalyst, but it appears a mediocre catalytic property due to the recombination of charge carriers. Constructing heterojunctions can boost the separation and suppress the recombination of photo-generated electron–hole pairs. For the conventional Type-II heterojunction, the oxidation ability is significantly reduced due to the decreasing of band gap. We try to maintain its oxidation capacity and promote the artificial bandgap by tailoring a Z-scheme heterojunction through interface engineering. Herein, we grafted different proportions of YMnO3 3D-nanoparticles onto g-C3N4 2D-nanosheets. This special 2D/3D mixed-dimensional nanocomposite exhibits efficient charge carrier transport performance according to the electrochemistry and photocurrent measurement. The outstanding photocatalytic oxidation ability can be verified by the rate of Rhodamine B degradation, which is 3.8 and 2.3 times of YMnO3 and g-C3N4, respectively. Theoretical calculation, active group capture experiments and electron spin resonance indicate the energy band position and the reactive groups (superoxide radicals and holes). The optimized g-C3N4/YMnO3 heterojunction utilizes the interfacial synergistic effect to achieve a composition of vigorous oxidizing ability and outstanding visible light harvesting. This work will pave a promising access for mechanism and interface engineering of other g-C3N4-based Z-scheme heterojunctions.
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Acknowledgement
This work was supported by the National Natural Science Foundations of China (No. 11574138, 11874200 and 21427801), the Top-Notch Young Talents Program of China, the National Key R&D Program of China (2016YFA0201104) and Dengfeng Project B of Nanjing University. Thanks are due to Mr. Wang for assistance with writing and to Mr. Xu for valuable discussion.
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Wu, Y., Zhou, X., Li, M. et al. 2D/3D interface engineering: direct Z-scheme g-C3N4/YMnO3 heterojunction for reinforced visible-light photocatalytic oxidation. J Mater Sci: Mater Electron 30, 17601–17611 (2019). https://doi.org/10.1007/s10854-019-02109-y
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DOI: https://doi.org/10.1007/s10854-019-02109-y