The photosynthesis of hydrogen peroxide (HO) from oxygen (O) represents a promising catalytic pathway, the limited efficiency of the oxygen reduction constitutes a primary barrier to enhancing production. In this content, alkali metal potassium (K) and Br-doped g-CN photocatalysts (K-CN) were successfully constructed by one-pot method. The introduction of K is not only beneficial to the transmission of space charge and the separation efficiency of photogenerated carriers, but also promotes the efficient production of HO by 2e oxygen reduction reaction. The introduction of Br promotes O converted to triplet state and triggers energy transfer process to increase O production, O adsorption was facilitated through regulating the oxygen evolution (O→O), which is beneficial to the subsequent oxygen reduction process. The results showed that the HO yield of 0.05 K-CN catalyst reached 26.0 mmol g h, which was more than 5 times that of pure g-CN.
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