Production of H₂O₂ via a more economic, green and safe way is challenging. In this work, we report an efficient production of H₂O₂ from oxygen reduction reaction (ORR) in aqueous solution over a modified WO₃ with Au nanoparticles. Under visible light at wavelengths longer than 420 nm for 5 h, H₂O₂ measured from WO₃ and Au/WO₃ were 1.07, and 177 μM, respectively. On addition of methanol, H₂O₂ obtained from WO₃, Au/WO₃, and Au/SiO₂ were 8.55, 544, and 0.36 μM, respectively. Photoluminescence and electrochemical measurement revealed that there was an interfacial electron transfer from the excited WO₃ to Au, followed by two-electron reduction of O₂ on Au sites. Under visible light at wavelengths longer than 535 nm, interestingly, H₂O₂ was also produced from Au/WO₃ (39 μM at 5 h), while the photocurrent of water oxidation on Au/WO₃ was much larger than those on Au/SiO₂ and WO₃. Clearly, there is also an interfacial electron transfer from the plasmonic Au to WO₃, followed by ORR to H₂O₂, but such a process fails when WO₃ is excited. However, the production of H₂O₂ on Au/WO₃ was determined by several factors, including Au content, light absorption, and particle size. A maximum H₂O₂ was observed at an initial pH 3.0 from 0.35 wt% Au/WO₃, prepared at 400 °C. Moreover, at the same loading on WO₃, Au was more efficient than Pd, Ag, Pt, Ni, Cu, and Co, while at the same Au loading, WO₃ was more efficient than BiVO₄ and Bi₂WO₆. The superior performance of Au/WO₃ is mainly due to its ability to undergo selective ORR to H₂O₂, and to release protons into aqueous solution protecting H₂O₂ from decomposition.

通过更经济，绿色和安全的方式生产H ₂ O ₂具有挑战性。在这项工作中，我们报告了在含Au纳米粒子的改性WO _3上，通过水溶液中的氧还原反应（ORR）可高效生产H ₂ O ₂。在波长大于420 nm的可见光下持续5 h，从WO ₃和Au / WO ₃测得的H ₂ O ₂分别为1.07和177μM。上加入甲醇，H ₂ ö ₂从WO得到₃，金/ WO ₃，和Au /二氧化硅₂分别为8.55、544和0.36μM。光致发光和电化学测量表明，存在从激发的WO ₃到Au的界面电子转移，然后在Au位点上O ₂的两电子还原。有趣的是，在波长大于535 nm的可见光下，Au / WO ₃（5 h时为39μM）也产生了H ₂ O ₂，而Au / WO ₃上水氧化的光电流远大于Au上的/ SiO ₂和WO ₃。显然，还存在从等离子Au到WO ₃的界面电子转移，然后是ORR到H ₂ O ₂的界面转移。但是，当WO ₃被激发时，这样的过程失败。但是，Au / WO ₃上H ₂ O ₂的产生取决于几个因素，包括Au含量，光吸收率和粒径。在400℃下制备的0.35重量％的Au / WO ₃的初始pH 3.0下观察到最大的H ₂ O ₂。此外，在WO ₃相同的负载下，Au比Pd，Ag，Pt，Ni，Cu和Co更有效，而在相同Au负载下，WO ₃比BiVO ₄和Bi ₂ WO ₆更有效。Au / WO ₃的卓越性能这主要归因于其对H ₂ O ₂进行选择性ORR以及将质子释放到水溶液中以保护H ₂ O ₂免受分解的能力。