Abstract
In this study, a g-C3N4-Cu2O-TiO2 photocatalyst with a novel three-dimensional ordered macroporous (3DOM) structure was successfully prepared using a sacrificial template strategy and a photodeposition method. The influence of the special porous structure with cross pore channels on the photocatalytic properties of the as-prepared sample was studied in detail. Compared with the original photocatalyst (TiO2 with 3 wt% Pt), g-C3N4-Cu2O-TiO2 exhibited a higher specific surface area and more active sites, thus accelerating the separation efficiency of the photogenerated electron-hole pair. Consequently, the as-prepared photocatalyst showed good photocatalytic performance, reaching a maximum hydrogen production rate of 12,108 µmol g−1 h−1 and approximately five times higher than that of the pristine comparison sample. The enhanced photoactivity of the g-C3N4-Cu2O-TiO2 heterojunction can be ascribed to its double p-n heterojunction and robust porous structure, where the photodeposited Cu2O plays a synergistic catalytic role in the photocatalytic process and the outer clad g-C3N4 layer prevents Cu2O oxidation. Additionally, the possible photocatalytic mechanism was briefly discussed based on the experimental results. This work identifies viable pathways for developing low-cost heterojunction photocatalysts with highly efficient photocatalytic activity toward improved solar energy conversion.
摘要
本文通过模板法与光沉积法成功制备了具有三维有序多孔结构的g-C3N4-Cu2O-TiO2光催化剂, 并详细研究了特殊多孔结构对原制备样品光催化性能的影响. 与原有的光催化剂相比, 多孔结构的g-C3N4-Cu2O-TiO2具有更高的比表面积和更多的活性位点, 从而加速了光生电子-空穴的分离效率. 因而, 该光催化剂表现出良好的光催化性能, 最大产氢率可达12,108 μmol g−1 h−1, 是原始对比样品产氢率的5倍左右. g-C3N4-Cu2O-TiO2对于光催化性能的增强可归因于其双p-n异质结和稳健的多孔结构. 此外, 光沉积Cu2O在光催化过程中起协同催化作用, 外层包覆的g-C3N4层保护Cu2O以防止催化剂氧化. 此外, 本文探究了该催化剂的光催化机理. 本工作为开发具有高效光催化活性的低成本异质结光催化剂开辟了新途径.
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Acknowledgements
This research was funded by the National Key Research and Development Program of China (2016YFC0300200), the National Natural Science Foundation of China (21975229) and the Natural Science Foundation of Zhejiang Province (Y19B060003).
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Author contributions Chen B conducted the experiment; Chen B and Yu J analyzed the data and wrote the original draft. Wang R, Zhang X, He B, Jin J and Wang H provided some meaningful suggestions. Chen B revised the manuscript. Gong Y conceived the idea and supervised this study.
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Ben Chen received his Bachelor’s degree from Wuhan University of Technology. He is currently studying for a Master’s degree under the supervision of Professor Yansheng Gong at China University of Geosciences (Wuhan). His research interest focuses on the photocatalytic hydrogen production.
Yansheng Gong received his PhD degree from Wuhan University of Technology under the supervision of Prof. Lianmeng Zhang. He then worked as a GCOE fellow at the Institute for Materials Research, Tohoku University for more than one year. He is currently an assistant professor at China University of Geosciences. He specializes in advanced structural materials and photocatalytic hydrogen production.
Conflict of interest The authors declare that they have no conflict of interest.
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Chen, B., Yu, J., Wang, R. et al. Three-dimensional ordered macroporous g-C3N4-Cu2O-TiO2 heterojunction for enhanced hydrogen production. Sci. China Mater. 65, 139–146 (2022). https://doi.org/10.1007/s40843-021-1714-9
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DOI: https://doi.org/10.1007/s40843-021-1714-9