Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (2): 20240380.doi: 10.7503/cjcu20240380

• Physical Chemistry • Previous Articles     Next Articles

First-principles Study of Doping and Point Defects Modulating the Photodissociative Water Properties of MoS2/ZnO Heterojunction

WEN Junqing1(), WANG Jiahui1, ZHANG Jianmin2   

  1. 1.School of Science,Xi’an Shiyou University,Xi’an 710065,China
    2.School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710062,China
  • Received:2024-08-05 Online:2025-02-10 Published:2024-10-28
  • Contact: WEN Junqing E-mail:wenjq2013@163.com
  • Supported by:
    the Natural Science Foundation of Shaanxi Province, China(2023-JC-YB-028);the Xi'an Shiyou University Postgraduate Innovation and Practical Ability Cultivation Program Project, China(YCS23113091)

Abstract:

The electronic structures, optical properties and photocatalytic performance of MoS2/ZnO heterojunction doping with C and Pd elements and point defects were studied using first principles calculations. The stable sites of C and Pd atom doping MoS2/ZnO heterojunction is S2 and Zn site, and the stable defect point is Zn defect. The analysis of electronic structures shows that band edge position of the intrinsic MoS2/ZnO presents a type II band alignments with a direct band gap of 0.66 eV. Doping and defects can effectively regulate the band gap of MoS2/ZnO. Pd@Zn system exhibits magnetic semiconductor, VMo and VZn systems exhibit magnetic metallic properties. Doping and defects increase the light absorption coefficient of MoS2/ZnO heterojunction in the visible light range(500—760 nm). Intrinsically, there is a built-in electric field from ZnO layer to MoS2 layer at the interface in the doping and defective MoS2/ZnO, which promotes charge transfer from ZnO layer to MoS2 layer. The charge transfer amount of Pd@Zn, C@S2&Pd@Zn increases. The intrinsic MoS2/ZnO, C@S2, Pd@Zn, VS1, VS2 and VO systems form direct Z-type heterojunctions, which promote the effective separation of photo generated electron hole pairs. The band edge potential of MoS2/ZnO, C@S2, Pd@Zn, VS1, VS2 and VO crosses the oxidation-reduction potential at pH=0 and 7, indicating that these heterojunctions can undergo oxidation-reduction reactions under strong acid solution and neutral solution conditions, and the carriers have strong oxidation-reduction ability.

Key words: MoS2/ZnO heterojunction, Doping and defect, Electronic structure, Photocatalytic property

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