Electrochemical two-electron water oxidation is a promising route for renewable and on-site H₂O₂ generation as an alternative to the anthraquinone process. However, it is currently restricted by low selectivity due to strong competition from the traditional four-electron oxygen evolution reaction, as well as large overpotential and low production rates. Here we report an interfacial engineering approach, where by coating the catalyst with hydrophobic polymers we confine in situ produced O₂ gas to tune the water oxidation reaction pathway. Using carbon catalysts as a model system, we show a significant increase of the intrinsic H₂O-to-H₂O₂ selectivity and activity compared to that of the pristine catalyst. The maximal H₂O₂ Faradaic efficiency was enhanced by sixfold to 66% with an overpotential of 640 mV, under which a H₂O₂ production rate of 23.4 µmol min⁻¹ cm⁻² (75.2 mA cm⁻² partial current) was achieved. This approach was successfully extended to nickel metal, demonstrating the wide applicability of our local gas confinement concept.

电化学双电子水氧化法是替代蒽醌方法的一种可再生和现场生成H ₂ O ₂的有前途的途径。然而，由于与传统的四电子氧释放反应的激烈竞争，以及由于过大的电势和低的生产率，目前由于选择性低而受到限制。在这里，我们报告了一种界面工程方法，该方法通过用疏水性聚合物涂覆催化剂来限制原位产生的O ₂气体，以调节水的氧化反应路径。使用碳催化剂作为模型系统，我们显示出固有的H ₂ O-to-H ₂ O ₂显着增加与原始催化剂相比具有更高的选择性和活性。在640 mV的超电势下，最大H ₂ O ₂法拉第效率提高了六倍，达到66％，在这种情况下，H ₂ O _2的生产率为23.4 µmol min ^-1 cm ^-2（75.2 mA cm ^-2分电流）。实现。这种方法已成功地扩展到镍金属，证明了我们当地的气体限制概念的广泛适用性。