Chinese Journal of Catalysis ›› 2024, Vol. 59: 204-213.DOI: 10.1016/S1872-2067(24)60003-3

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Self-sacrificing MOF-derived hierarchical porous In2S3 nanostructures with enhanced photocatalytic performance

Tingting Yanga,1, Bin Wanga,b,1, Paul K. Chub, Jiexiang Xiaa,*(), Huaming Lia,*()   

  1. aSchool of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, Jiangsu, China
    bDepartment of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
  • Received:2023-12-14 Accepted:2024-02-08 Online:2024-04-18 Published:2024-04-15
  • Contact: *xjx@ujs.edu.cn (J. Xia); lhm@ujs.edu.cn (H. Li).
  • About author:

    1Contributed equally to this work.

  • Supported by:
    The National Natural Science Foundation of China(22108106);The National Natural Science Foundation of China(22108108);The China Postdoctoral Science Foundation(2022M721380);City University of Hong Kong Donation Research(DON-RMG 9229021)

Abstract:

Fabrication of porous hierarchical structures is an effective method to improve the photo-absorption capability of photocatalysts by enhancing the photogenerated charge separation and transfer. In-based metal-organic frameworks (MOFs) are utilized as self-sacrificial templates to synthesize various hierarchical In2S3 photocatalysts including hollow nanotubes/microtubes/ spheres and dodecahedrons by the sulfidation process. The porous hierarchical structures improve multiple refraction and reflection of the incident light, provide larger surface areas, and increase the light utilization and phase separation efficiency of the photogenerated carriers. As a result, the photocatalytic efficiency is much higher than that of the bulk and commercial In2S3. In particular, the hollow In2S3 nanotubes (HNTs) have the best photocatalytic properties boosting degradation rates of organic pollutants that are 135.6 and 446.9 times than those of the bulk and commercial-grade In2S3, respectively. Theoretical calculations, optical/electrical characterization, and free radical trapping experiments reveal that under the condition of light, the photogenerated electron hole pairs produced in In2S3-HNT can effectively separate due to its hierarchical porous structure. So, the In2S3-HNT can accumulate more reactive oxygen radicals. This novel self-sacrificial template method has large potential in the design and fabrication of hierarchical high-efficiency photocatalysts.

Key words: In2S3, Metal-organic framework, Morphological control, Photocatalysis, Pollutants degradation