Overall water solar-splitting is one of the most attractive candidates to break water down into hydrogen peroxide (H₂O₂) and hydrogen (H₂) in a cheapest and cleanest way (i.e., 2H₂O →H₂O₂+ H₂). However, the generated intermediate H₂O₂ in the 2e- process would poison the catalysts. Hence, it is an ideal pathway to generate H₂O₂ by 4e-–2e- cascaded process (H₂O→O₂→H₂O₂), which is more thermodynamically advantageous and can also avoid the catalyst poisoning by the intermediate product of H₂O₂. Herein, we report CoP modified by carbon dots (CoP/CDs composite) to realize simultaneous generation of H₂ and H₂O₂ via a 4e-–2e- cascaded pathway, coupling photocatalytic water oxidation (4e-) and oxygen reduction reaction (2e-). The optimal CoP/CDs sample displays a prominent H₂ yield of 239 μmol/h/g and H₂O₂ production rate of 466 μmol/h/g without sacrificial agent at normal pressure. It exhibits the highest photocatalytic activity for water decomposition to produce H₂ and H₂O₂ simultaneously. Moreover, the quantum efficiency of the as-prepared sample is 2.05 % at 535 nm. This work offers a novel approach to achieve high-efficiency production of H₂ and H₂O₂ by photocatalytic water splitting.

总的太阳能分解是最有吸引力的候选方法之一，它可以以最便宜和最清洁的方式（即2H ₂ O→H ₂ O ₂ + H ）将水分解为过氧化氢（H ₂ O ₂）和氢（H ₂）。₂）。但是，在2e过程中生成的中间体H ₂ O ₂会毒化催化剂。因此，这是通过4e-2e级联过程生成H ₂ O ₂的理想途径（H ₂ O→O ₂ →H ₂ O ₂），这在热力学上更具优势，并且还可以避免H ₂ O ₂的中间产物引起的催化剂中毒。本文中，我们报道了通过碳点修饰的CoP（CoP / CDs复合材料），通过4e--2e级联途径实现了H ₂和H ₂ O _2的同时生成，耦合了光催化水氧化（4e-）和氧还原反应（ 2e-）。最佳的CoP / CDs样品在常压下不使用牺牲剂的情况下显示出239μmol/ h / g的显着H ₂收率和466μmol/ h / g的H ₂ O ₂生产率。它对水分解产生H ₂和H具有最高的光催化活性同时₂ O ₂。此外，所制备样品的量子效率在535nm为2.05％。这项工作提供了一种新颖的方法，可通过光催化水分解实现H ₂和H ₂ O ₂的高效生产。