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

Abstract

MoS 2 @In 2 S 3 /Bi 2 S 3 core - shell dual Z-scheme tandem heterojunction photocatalyst is fabricated by two-step hydrothermal methods and exhibits excellent photocatalytic performance. It can be attributed to unique core-shell dual Z-scheme tandem heterojunction structure favors efficient interface contact and facilitates the transfer and spatial separation of photogenerated electron-hole pairs and prolongs the carrier lifetime. • MoS 2 @In 2 S 3 /Bi 2 S 3 core-shell dual Z-Scheme tandem heterojunction is fabricated. • It shows broad-spectrum response and excellent photothermal effect. • It exhibits excellent photocatalytic hydrogen evolution and degradation performance. • Dual Z-scheme tandem heterostructures promotes effective spatial charge separation. Oxygen-doped MoS 2 @In 2 S 3 /Bi 2 S 3 core-shell dual Z-scheme tandem heterojunctions are fabricated via two-step hydrothermal methods. In 2 S 3 and Bi 2 S 3 nanosheets grow on the outer surface of oxygen-doped MoS 2 spheres, and the tight interface between the spheres could ensure stable electron transfer. MoS 2 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 MoS 2 @In 2 S 3 /Bi 2 S 3 shows broad-spectrum response and excellent photothermal effect, which is beneficial to trigger the near-field temperature rise and promote the photocatalytic process. The MoS 2 @In 2 S 3 /Bi 2 S 3 exhibits excellent photocatalytic H 2 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 MoS 2 . 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.