UV-light irradiation of gold nanoparticle-loaded ZnO with a heteroepitaxial junction (Au#ZnO) in aerated ethanol aqueous solution gives rise to two-electron oxygen reduction reaction (ORR) to yield more than 1 mM hydrogen peroxide at only 1-h irradiation. The photocatalytic activity has been revealed to remarkably increase with increasing Au particle size as the result of the increase in H₂O₂ formation rate and the decrease in its decomposition rate. The outstanding photocatalytic activity of Au#ZnO can mainly stem from the enhancement of charge-separation and the reduction in the loss of H₂O₂ by the non-adsorptivity of ZnO.

中文翻译：

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氧化锌负载的金纳米粒子对两电子氧还原反应光催化活性的尺寸效应

在充气乙醇水溶液中用异质外延结（Au＃ZnO）用金纳米颗粒负载的ZnO的紫外光照射引起两电子氧还原反应（ORR），仅在1小时的照射下产生超过1 mM的过氧化氢。已经发现，由于H ₂ O ₂形成速率的增加和其分解速率的降低，光催化活性随着Au粒径的增加而显着增加。Au＃ZnO出色的光催化活性主要归因于ZnO的非吸附性，电荷分离的增强和H ₂ O ₂损失的减少。