MoS2@In2S3/Bi2S3 Core-shell dual Z-scheme tandem heterojunctions with Broad-spectrum response and enhanced Photothermal-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 photocatalytic H2 evolution rate of 973.42 μmol 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.