Morphology engineering and photothermal effect derived from perylene diimide based derivative for boosting...

The construction of excellent photocatalysts for splitting water into hydrogen is highly desirable to realize carbon neutralization. In this work, an innovative and well-designed S-scheme photocatalyst composed of ultrathin ZnIn₂S₄ (ZIS) nanosheets uniformly anchored on the surface of organic semiconductor PDIIM is successfully fabricated. Within the heterojunction, perylene diimide with an imidazole group (PDIIM) is strategically applied as a structure template, which plays a crucial role in optimizing the morphology, increasing the active sites of sulfur vacancies, providing the additional photothermal effect, and promoting photogenerated charge separation of the catalyst. The photocatalytic H₂ generation rate of the ZIS/PDIIM heterojunction with an optimized mass ratio reaches up to 13.04 mmol/g/h, which is 2.64 times and 14.02 times higher than that of pristine ZIS and PDIIM, respectively. The outstanding photocatalytic activity is attributed to the synergistic effect of the above advantages. Importantly, the photothermal effect induced by PDIIM belonging to the perylene diimide-based derivative was discovered to accelerate photocatalytic H₂ generation for the first time. This work provides valuable insight into the utilization of perylene diimide-based derivatives in the construction of multi-effect enhancement photocatalysts and their application in photothermal-assisted photocatalytic hydrogen evolution.