Photocatalytic H₂O₂ production in pure water is prerequisite for diverse on-site applications, but challengeable to be realized owing to sluggish water oxidation and significant recombination of photogenerated charges. Herein, efficient photocatalytic H₂O₂ production in pure water was realized on graphitic carbon nitride (GCN) decorated by oxidative red phosphorus (ORP). The composite produces 250 μM of H₂O₂ within 120 min under visible light irradiation via synchronous water oxidation and oxygen reduction reactions, which is more than 25-fold enhancement of pristine GCN. It is revealed that red phosphorus (RP) can significantly promote charge separation but induce reductive decomposition of H₂O₂. Successfully, H₂O₂ decomposition over RP is dramatically suppressed by preventing the interaction between H₂O₂ and P atoms through oxidizing RP with the formation of PO bonds by an oxidation post-treatment. This strategy opens a new door for the rational design of highly active metal-free photocatalysts toward solar-to-H₂O₂ conversion in pure water.

在纯水中光催化生产H ₂ O ₂是各种现场应用的先决条件，但由于水氧化缓慢和光生电荷的显着重组，实现这一目标具有挑战性。在此，在氧化红磷 (ORP) 修饰的石墨氮化碳 (GCN) 上实现了在纯水中高效的光催化 H ₂ O ₂生产。该复合材料产生 250 μM 的 H ₂ O ₂在可见光照射下 120 分钟内通过同步水氧化和氧还原反应，比原始 GCN 增强了 25 倍以上。结果表明，红磷（RP）可以显着促进电荷分离，但会引起H ₂ O _{2 的}还原分解。成功地，通过通过氧化后处理形成 P O 键来氧化 RP，阻止 H ₂ O ₂和 P 原子之间的相互作用，显着抑制了H ₂ O ₂在 RP 上的分解。该策略为合理设计高活性无金属光催化剂向太阳能转化为 H ₂ O ₂开辟了新的大门 在纯水中转化。