J. Mater. Sci. Technol. ›› 2023, Vol. 145: 116-124.DOI: 10.1016/j.jmst.2022.10.041

• Research Article • Previous Articles     Next Articles

Construction of PdS@MIL-125-NH2@ZnS type-II heterostructure with efficient charge separation for boosted photocatalytic hydrogen evolution

Zige Taia, Guotai Suna,b,*, Ting Wanga, Zhihui Lib, Jinge Taic   

  1. aResearch & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518063, China;
    bState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;
    cThe Second Affiliated Hospital of Air Force Military Medical University, Xi'an 710038, China
  • Received:2022-08-16 Revised:2022-10-05 Accepted:2022-10-13 Published:2023-05-10 Online:2022-12-08
  • Contact: * E-mail address: sunguotai88@163.com (G. Sun).

Abstract: A new photocatalyst, PdS@NH2-MIL-125(Ti)@ZnS (PdS/M125/ZnS) heterojunction is fabricated for photocatalytic H2 generation for the first time, where PdS nanoparticles are anchored in the pore of M125 by utilizing its confinement effect, and the ZnS is closely wrapped on the surfaces of the MOFs. The optimal photocatalyst exhibits a significantly enhanced H2 generation rate of 1164.2 μmol/g/h, while the pure M125 only displays a H2 generation rate of 16.7 μmol/g/h. The resultant improvement can be ascribed to the following comprehensive advantages. The hierarchical structure built by PdS, M125, and ZnS can form lots of intimate interfaces, offer abundant sites for reaction, and smooth channels for charge carriers due to the porous characteristics of MOFs. Moreover, M125 and ZnS with inner defect levels form an analogous type-II heterojunction assisted by PdS co-catalyst, which greatly promotes charge separation. This work may supply a new avenue to design MOFs photocatalysts for energy conversion.

Key words: Hydrogen evolution, Water splitting, Metal-organic framework, Defect levels, Type-II heterostructure