Semiconductor-based photocatalytic water splitting is a promising technology to convert solar energy into chemical energy. However, the photocatalytic performance is seriously limited by the low photo-generated charge separation efficiency and high interfacial reaction resistance. Here, a hollow double-shell stacked CdS@ZnIn₂S₄ system was firstly constructed. The Pt and Co₃O₄ nanoparticles (NPs) as the hydrogen evolution and the hydrogen peroxide production cocatalysts were loaded on the inner surface and outer surface of CdS@ZnIn₂S₄ to obtain a novel Pt/CdS@ZnIn₂S₄/Co₃O₄ photocatalyst. Compared with the CdS@ZnIn₂S₄ and dual cocatalysts randomly incorporated CdS@ZnIn₂S₄/(Pt+Co₃O₄) sample, this well-designed photocatalyst shows high photocatalytic performance with hydrogen evolution rate and H₂O₂ production rate reached 8.53 mmol g⁻¹ h⁻¹ and 5.26 mmol g⁻¹ h⁻¹, respectively, which are 3.8 and 1.8 times higher than those of CdS@ZnIn₂S₄ sample. The enhanced photocatalytic performance can be attributed to the formation of compact heterojunction structure between the ultrathin double shells, which can promote the separation of electron-hole pairs due to its built-in field effect. Besides, the synergistic effect of spatially separated dual cocatalysts are beneficial to the migration of the photo-generated charges to the opposite direction and the suppression of the reverse reaction. This work would pave a way to design unique structure and high-performanced photocatalyts towards photocatalytic water splitting.

基于半导体的光催化水分解是一种将太阳能转化为化学能的有前途的技术。然而，光催化性能受到光生电荷分离效率低和界面反应电阻高的严重限制。在这里，首次构建了空心双壳堆叠CdS@ZnIn ₂ S _4体系。将Pt和Co ₃ O _{4纳米粒子（NPs）作为析氢和过氧化氢生产的助催化剂分别负载在CdS@ZnIn 2} S ₄的内外表面，得到了一种新型Pt/CdS@ZnIn ₂ S ₄ /钴₃ O ₄光催化剂。与 CdS@ZnIn ₂ S ₄和双助催化剂随机掺入的 CdS@ZnIn ₂ S ₄ /(Pt+Co ₃ O ₄ ) 样品相比，这种精心设计的光催化剂具有较高的光催化性能，具有析氢速率和 H ₂ O ₂产量速率分别达到8.53 mmol g ^-1 h ^-1和5.26 mmol g ^-1 h ^{-1 ，分别是CdS@ZnIn} ₂ S ₄的3.8和1.8倍样本。增强的光催化性能可归因于在超薄双壳层之间形成致密的异质结结构，由于其内置的场效应可以促进电子-空穴对的分离。此外，空间分离的双助催化剂的协同效应有利于光生电荷向相反方向迁移和抑制逆反应。这项工作将为设计用于光催化水分解的独特结构和高性能光催化剂铺平道路。