Photocatalytic H2 Production via MoS2/SnS2/TiO2 Nanosheet-Based Schottky/S-Scheme Integrate Heterojunction with Charge Storage Capability

To address the critical challenge of severe charge carrier recombination and insufficient utilization during photocatalytic H2 production, in this work, a MoS2/SnS2/TiO2 Schottky/S-scheme integrated heterojunction with charge storage capability was prepared using a hydrothermal method combined with physical solvent evaporation. Experimental findings indicate that integrated MoS2/SnS2/TiO2 heterojunction achieves a photocatalytic H2 production rate of 4713.8 μmol·g–1·h–1 under visible light irradiation in a 20% vol triethanolamine (TEOA) aqueous solution, which is 40.8 and 67.5 times higher than that of TiO2 and MoS2/SnS2 heterojunction. Besides, this system exhibits remarkable stability during cyclic experiments. The charge separation mechanism and carrier storage characteristics of the system were validated through electrochemical measurements, XPS analysis, PL spectroscopy characterization and density functional theory (DFT). It was found that MoS2 as H2 evolution cocatalyst can reduce the overpotential for H2 generation, MoS2/SnS2 can enhance decrease charge transfer resistance, promote carriers separation, increase active sites, they collectively facilitates faster H2-releasing kinetics. This research proposes an innovative strategy for constructing a highly efficient photocatalytic system that integrates effective charge storage and separation.