In this study, Au-nanoparticle-supported crystalline ZnO (Au/ZnO) is found to be a simple and efficient photocatalyst for direct H₂O₂ synthesis in an aerated aqueous solution. Compared with widely studied Au-nanoparticle-supported anatase TiO₂ photocatalyst, Au/ZnO shows almost one order of magnitude higher activity in H₂O₂ production. The site-specific deposition of smaller Au nanococatalyst on ZnO delivers best photocatalytic performance and the H₂O₂ production is relatively stable with a rate more than 1.5 mmol L⁻¹ h⁻¹. The electron spin resonance studies reveal that the H₂O₂ is produced through direct 2e⁻ oxygen reduction over the optimized Au/ZnO photocatalyst.

在这项研究中，金纳米颗粒负载的结晶ZnO（Au / ZnO）被发现是一种简单有效的在充气水溶液中直接合成H ₂ O _2的光催化剂。与被广泛研究的金纳米颗粒负载的锐钛矿型TiO ₂光催化剂相比，Au / ZnO在H ₂ O ₂生产中的活性提高了近一个数量级。较小的Au纳米助催化剂在ZnO上的定点沉积可提供最佳的光催化性能，并且H ₂ O _2的产生相对稳定，速率超过1.5 mmol L ^-1  h ^-1。电子自旋共振研究表明H ₂ O₂是通过直接2E产生^-降低通过所述优化的Au /氧化锌催化剂的氧。