4.7 Article

MoS2@In2S3/Bi2S3 Core-shell dual Z-scheme tandem heterojunctions with Broad-spectrum response and enhanced Photothermal-photocatalytic performance

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 431, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133355

Keywords

Photocatalysis; Dual Z-scheme; Tandem heterojunction; Core-shell; Broad-spectrum response

Funding

  1. Na-tional Natural Science Foundation of China [21871078]
  2. NaturalScience Foundation of Heilongjiang Province [JQ2019B001]
  3. Hei-longjiang Postdoctoral Startup Fund [LBH-Q14135]
  4. Heilongjiang University Science Fund for Distinguished Young Scholars [JCL201802]
  5. Heilongjiang Provincial Institutions of Higher Learning Basic Research Funds Basic Research Projects [KJCX201909]

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Oxygen-doped MoS2@In2S3/Bi2S3 core-shell dual Z-scheme tandem heterojunctions exhibit excellent photothermal effect and photocatalytic performance.
Oxygen-doped MoS2@In2S3/Bi2S3 core-shell dual Z-scheme tandem heterojunctions are fabricated via two-step hydrothermal methods. In2S3 and Bi2S3 nanosheets grow on the outer surface of oxygen-doped MoS2 spheres, and the tight interface between the spheres could ensure stable electron transfer. MoS2 with oxygen defects could inhibit the recombination of photo-induced electron-hole pairs. The unique core-shell structure increases the interface area and provides adequate surface reactive sites for the reactants. The resultant MoS2@In2S3/Bi2S3 shows broad-spectrum response and excellent photothermal effect, which is beneficial to trigger the near-field temperature rise and promote the photocatalytic process. The MoS2@In2S3/Bi2S3 exhibits excellent photo-catalytic H-2 evolution rate of 973.42 mu mol h(-1) g(-1), and the degradation efficiency of tetracycline within 90 min is 99.6%, which is ~ 10 times higher than that of pristine MoS2. It can be ascribed to the unique core-shell dual Z-scheme tandem heterojunction structure facilitates the transfer and spatial separation of photogenerated electron-hole pairs, and greatly prolongs the carrier lifetime. In addition, the long-term stability indicates the potential applications due to the core-shell dual Z-scheme tandem structure inhibiting the photocorrosion of sulfides.

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