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Facile Construction of a Hollow In2S3/Polymeric Carbon Nitride Heterojunction for Efficient Visible-Light-Driven CO2 Reduction

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journal contribution
posted on 23.04.2021, 15:36 authored by Shuangchao Zhao, Keyan Li, Jun Du, Chunshan Song, Xinwen Guo
The development of high-efficiency photocatalysts is of great importance to realize robust solar-driven CO2 conversion; however, the low carrier separation efficiency and poor light absorption ability usually limit the performance of the photocatalysts. Herein, a hollow In2S3/polymeric carbon nitride (IS/CN) heterojunction was prepared via electrostatic self-assembly and in situ sulfidation under solvothermal conditions. The intimate interfacial contact between the IS and CN facilitates the construction of an effective heterojunction, as demonstrated by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The optimized IS/CN-5 sample exhibits a high CO evolution rate of 483.4 μmol g–1 h–1, which is 99 and 6 times as high as that of IS and CN, respectively. The improved charge separation and transfer efficiency, the hollow nanotube structure, and the enhanced CO2 adsorption ability are the reasons for the excellent photocatalytic activity. Besides, a possible photocatalytic mechanism of CO2 reduction by the IS/CN heterojunction was proposed on the basis of the band structures. This work provides an effective and facile strategy to construct hollow semiconductor heterojunctions for photocatalytic applications.