The photosynthesis of H₂O₂ is a promising green process that is expected to revolutionize industrial H₂O₂ synthesis. However, it is still far from application because of the limited performance of photocatalysts. In this study, benzyl alcohol (BA) is excited under UV light with a wavelength shorter than 400 nm after it forms an epoxy with dissolved oxygen to generate high-concentration H₂O₂ without a photocatalyst. An H₂O₂ yield of up to 176.43 mM·h⁻¹ in aqueous solution is achieved, which is close to the yield required for commercial production. The by-product benzaldehyde (BD) accelerates H₂O₂ production in the early stage but consumes H₂O₂ in the later stage, where it is further converted to benzoic acid (BC). In this photoreaction, only air is employed as the oxidant, and sunlight provides the reaction energy; no photocatalyst is needed. This reaction, combined with a simple mild H₂ reduction process using BD, can be used for green closed-loop H₂O₂ production without waste and by-product discharge, where BA is a recycled intermediate. This study provides a sustainable strategy for low-cost, low-energy H₂O₂ production with excellent application potential.

_{H 2} O ₂的光合作用是一种很有前途的绿色过程，有望彻底改变工业H ₂ O ₂合成。然而，由于光催化剂的性能有限，距离应用还有很长的路要走。在这项研究中，苯甲醇 (BA) 在波长小于 400 nm 的紫外光下与溶解氧形成环氧树脂后，在没有光催化剂的情况下产生高浓度 H ₂ O ₂。实现了在水溶液中高达176.43 mM·h ^-1的H ₂ O _{2产率，这接近于商业生产所需的产率。}副产物苯甲醛 (BD) 加速 H ₂前期产生O 2 ，​​后期消耗H 2 _{O 2}，_{​​进一步}转化为苯甲酸（BC）。在这种光反应中，只有空气作为氧化剂，阳光提供反应能量；不需要光触媒。该反应与使用 BD 的简单温和 H ₂还原工艺相结合，可用于绿色闭环 H ₂ O ₂生产，无废物和副产物排放，其中 BA 是可回收的中间体。该研究为低成本、低能耗的H ₂ O ₂生产提供了一种可持续的策略，具有极好的应用潜力。