Multi-hierarchical CuS/SnIn4S8 S-scheme heterojunction for superior photothermal-assisted photocatalytic hydrogen production

Abstract

Various methods aimed at enhancing light trapping and charge separation efficiencies have emerged as a central research focus in the field of photocatalysis. This study marks the successful construction of CuS/SnIn4S8 composite photocatalysts for the first time. Firstly, the interesting multi-hierarchical architecture enables efficient light harvesting and abundant active sites. Secondly, the excellent photothermal effect of the composite makes its surface temperature reach up to 173 °C after 300 s exposure to simulated sunlight. Thirdly, the S-scheme heterojunction establishes a unique channel guaranteeing improved charge separation and transfer as well as boosted charge reactivity. Thanks to these synergistic effects, the developed CuS/SnIn4S8 heterostructure demonstrates superior solar-driven photocatalytic water splitting for hydrogen production, with an average hydrogen evolution rate of as high as 6235.72 μmol g−1 h−1, which is 20 times and 4 times higher than that of single-phase CuS and SnIn4S8, respectively. This work proposes a novel concept for the design of photothermal-assisted composite photocatalysts.