Constructing a dual-functional 0D/2D-3D PtO/ZnIn₂S₄ photocatalyst for phenylcarbinol oxidation and H₂ production under visible light

The efficient harnessing of photoexcited charge carriers in photocatalytic systems is essential for addressing contemporary energy and environmental challenges; however, significant obstacles remain in achieving high conversion efficiencies. This study introduces a novel 0D/2D-3D PtO/ZnIn₂S₄ (PtO/ZIS) heterostructure photocatalyst, engineered to boost the separation and transfer of photoexcited charge carriers and drive the selective oxidation of phenylcarbinol (BA), concurrently producing hydrogen (H₂) in mild reaction conditions. The optimized formulation of 1 % PtO/ZIS demonstrated remarkable photocatalytic capabilities, attaining an H₂ evolution rate of 43.1 mmol g⁻¹ h⁻¹ with a 90.6 % selectivity for benzaldehyde (BAD). The mechanism exploration confirmed the photoexcited electrons on ZIS transferred to PtO to react with hydrogen protons to generate H₂. While the photoexcited holes located on ZIS were used to selectively oxidize BA into value-added fine chemicals. This photocatalytic system surpasses traditional hole scavengers, such as lactic acid and sodium sulfide/sodium sulfite systems, in H₂ production efficiency. This investigation delves into the synergistic mechanisms facilitating photogenerated carrier utilization, which provides pivotal insights for the advancement of photocatalysts capable of dual functionalities: high-value chemical synthesis and clean energy generation.