Designing highly efficient photocatalyst for hydrogen peroxide (H₂O₂) production is an ideal strategy to avoid the shortcomings of traditional H₂O₂ production and to realize the conversion of solar energy to chemical energy. In this work, a step-scheme (S-scheme) heterojunction photocatalyst composed of ZnO and WO₃ is carefully prepared by hydrothermal and calcination method for efficient photocatalytic H₂O₂ production. The ZW30 composite photocatalysts exhibit enhanced activity with the highest H₂O₂-production rate of 6788 μmol L⁻¹ h⁻¹. The results show that the photocatalytic H₂O₂ production process is dominated by a direct two-electron O₂ reduction pathway. The enhanced photocatalytic H₂O₂-production activity is attributed to the formation of interfacial internal electric field (IEF) in the S-scheme heterojunction, which boosts the spatial separation of charge carriers and enables electrons with the strongest reduction power to participate in H₂O₂ production. This work provides an in-depth insight of the great advantages of S-scheme heterojunction in photocatalytic H₂O₂ production.

_{设计生产过氧化氢（H 2} O ₂ ）的高效光催化剂是避免传统H ₂ O ₂生产的缺点，实现太阳能向化学能转化的理想策略。在这项工作中，通过水热法和煅烧法精心制备了一种由ZnO和WO _{3组成的分步（S型）异质结光催化剂，用于高效光催化H 2} O ₂生产。ZW30复合光催化剂表现出增强的活性，最高的H ₂ O ₂产率为6788 μmol L ^-1 h ^-1. 结果表明，光催化H ₂ O ₂生产过程以直接双电子O ₂还原途径为主。增强的光催化 H ₂ O ₂生成活性归因于 S 型异质结中界面内电场 (IEF) 的形成，这促进了电荷载流子的空间分离，并使具有最强还原能力的电子参与 H ₂ O ₂生产。这项工作深入了解了 S 型异质结在光催化 H ₂ O ₂生产中的巨大优势。