Photocatalytic H₂ evolution has been proven as one of the promising strategies for addressing global energy and environmental issues. Herein, a binary Z-scheme heterostructure of a WO₃/ZnIn₂S₄ photocatalyst was artificially constructed through a simple hydrothermal method. A variety of characterization tests were employed to prove the effective coupling of WO₃ nanoparticles and ZnIn₂S₄ particles for the fabrication of the WO₃/ZnIn₂S₄ heterostructure. It was found that the decoration of WO₃ nanoparticles could significantly promote the photocatalytic H₂ evolution activity of ZnIn₂S₄ under visible-light irradiation, and the H₂ evolution rate of 5 wt% WO₃/ZnIn₂S₄ composite could reach 1945.88 μmol h⁻¹ g⁻¹, which was 7.9 times that of pristine ZnIn₂S₄ and could rival that of previously reported ZnIn₂S₄-based photocatalysts. On the basis of photoelectrochemical results, the direct Z-scheme heterojunction rather than the type-II heterojunction was proposed to explain the significantly enhanced photocatalytic performance of the WO₃/ZnIn₂S₄ photocatalyst. The enhancement of photocatalytic activity could be attributed to the efficient Z-direction charge transfer at the WO₃/ZnIn₂S₄ heterostructure interface, thus reducing the recombination rate of the photogenerated carriers of the system. This work provides new insights into the construction of direct Z-scheme heterostructured ZnIn₂S₄-based photocatalysts for highly efficient photocatalytic H₂ evolution.

中文翻译：

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人工构建的直接Z方案异质结：WO3纳米颗粒修饰的ZnIn2S4，可有效地光催化制氢

光催化H _2的释放已被证明是解决全球能源和环境问题的有前途的策略之一。在此，通过简单的水热法人工构建了WO ₃ / ZnIn ₂ S ₄光催化剂的二元Z-方案异质结构。进行了各种表征测试，以证明WO ₃纳米粒子与ZnIn ₂ S ₄粒子的有效偶联，用于制造WO ₃ / ZnIn ₂ S ₄异质结构。发现WO ₃纳米粒子的装饰可以显着促进光催化H₂日宁的进化活性₂小号₄可见光照射下，和H ₂的5重量％的释放速率WO ₃ /日宁₂小号₄复合可达到1945.88微摩尔ħ ^-1克^-1，这是7.9倍的原始ZnIn ₂ S ₄，可以与以前报道的基于ZnIn ₂ S ₄的光催化剂相媲美。根据光电化学结果，提出了直接的Z型异质结而不是II型异质结来解释WO ₃ / ZnIn的显着增强的光催化性能。₂ S ₄光催化剂。光催化活性的增强可以归因于在WO ₃ / ZnIn ₂ S ₄异质结构界面处的有效Z方向电荷转移，从而降低了系统的光生载流子的复合率。这项工作为直接的Z方案异质结构ZnIn ₂ S ₄基光催化剂的构建提供了新的见解，以实现高效的光催化H ₂释放。