Abstract
Graphitic carbon nitride (g-C3N4), a new two-dimensional (2D) polymeric semiconductor, is considered as one of the most promising candidates for visible-light photocatalytic H2 evolution. The synthesis of thin-layered g-C3N4 is a facile approach to enhancing its photocatalytic properties. Here, a novel, cost-efficient, and time-saving strategy is reported to obtain 2D g-C3N4. In this equipment, bulk g-C3N4 and thin-layered g-C3N4 (denoted as G-CN) assembled from gaseous molecules were obtained simultaneously. The thin-layered g-C3N4 possesses more negative conduction-band minimum (~ 0.18 eV) relative to the bulk counterparty, leading to stronger redox ability. What is more, the carrier mobility and separation efficiency are both improved. As a result, the water splitting performance and photodegradation efficiency for methylene blue on thin-layered g-C3N4 are dramatically improved. The H2 evolution rate and half-time of photodegradation obtained by kinetic fitting reached 48.83 μmol h−1 and about 1.5 h, which is much more superior to that of bulk g-C3N4. Generally, the present work may bring out new thinking to synthesize thin-layered 2D materials.
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Acknowledgements
This work is supported by the National Nature Science Foundation (51672220), the SPDRF (20116102130002), the 111 Program (B08040) of MOE, the National Defense Science Foundation (32102060303), the Xi’an Science and Technology Foundation (2017086CGRC049-XBGY005, 2017040CG-CG024), the SKLP Foundation (KP201421, KP201523), the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University (Z2018007), the Shaanxi Provincial Science Foundation (2017KW-018), and the NPU Gaofeng Project (17GH020824) of China. We would like to thank the Analytical and Testing Center of Northwestern Polytechnical University for AFM and TEM analysis.
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Wen, Y., Fan, H., Ning, L. et al. Graphitic carbon nitride nanosheets prepared by gaseous molecules assembling for enhanced photocatalytic performance. J Mater Sci 54, 1462–1474 (2019). https://doi.org/10.1007/s10853-018-2937-5
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DOI: https://doi.org/10.1007/s10853-018-2937-5