To address the key scientific problem of insufficient charge separation efficiency in the photocatalytic systems, the solution in this study is to optimise the electric field within the interface by constructing metal-semiconductor ohmic heterojunctions. The MoWS₂/ZnCdS (ZCMWS) composite catalysts with layered nanoflowers of MoWS₂ modified nanoparticles of ZnCdS were successfully prepared by solvent-thermal coupled mechanical stirring method. The material characterization combined with theoretical calculations confirmed the existence of typical ohmic contact properties at this heterogeneous interface, enabling low-resistance directional transport of photogenerated charge carriers. Under visible light irradiation, the optimized ZCMWS-15 catalyst demonstrated a visible-light-driven H₂ evolution rate of 11.35 mmol·g^-1·h^-1, representing a 4-fold enhancement over pristine ZnCdS. Notably, the catalyst maintained 96.38% initial activity after four cycles, with enhanced stability attributed to robust interfacial electronic coupling that effectively mitigates photocorrosion. This work establishes a novel paradigm for constructing high-performance photocatalytic architectures and stable photocatalytic systems through the strategy of regulating the electrical properties of the interface.

中文翻译：

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ZnCdS 结合层状纳米花 MoWS2 欧姆结促进光催化析氢

为了解决光催化系统中电荷分离效率不足的关键科学问题，本研究的解决方案是通过构建金属-半导体欧姆异质结来优化界面内的电场。采用溶剂-热耦合机械搅拌法，成功制备了 MoWS₂/ZnCdS（ZCMWS）复合催化剂与 MoWS₂ 改性的 ZnCdS 纳米颗粒的层状纳米花。材料表征与理论计算相结合，证实了该异质界面存在典型的欧姆接触特性，从而实现了光生载流子的低电阻定向传输。在可见光照射下，优化的 ZCMWS-15 催化剂表现出可见光驱动的 H₂ 析出速率为 11.35 mmol·^g-1·^h-1，比原始 ZnCdS 提高了 4 倍。值得注意的是，该催化剂在四个循环后保持了 96.38% 的初始活性，其稳定性增强归因于强大的界面电子耦合，有效减轻了光腐蚀。这项工作通过调节界面的电特性的策略，为构建高性能光催化结构和稳定的光催化体系建立了一种新的范式。