Photocatalytic production of H₂O₂ from water and oxygen utilizing polymetric carbon nitride (PCN) is a promising alternative to the energy-consuming anthraquinone method. However, insufficient oxidation potential and limited light-absorption have restricted its further improvement. Herein, PCN with sufficient oxidation potential and improved visible-light usage (up to 550 nm) was prepared by co-polymerization of 2,5,8-triamino-tri-s-triazine (melem) and barbituric acid (BA). With the loading of Na₂CoP₂O₇ as a water-oxidation co-catalyst, this novel PCN system showed a record-high apparent quantum efficiency (420 nm) of 8.0 % and a solar-to-chemical conversion efficiency of 0.30 % for H₂O₂ production. This improvement is attributed to the introduced O 2p states by CO groups remained in the PCN matrix, leading to a positive valence band maximum of 1.85 eV (vs. SHE). The co-polymerization of BA and melem combined with Na₂CoP₂O₇ loading also suppressed the charge recombination, resulting in a rapid stepwise one-electron to one-electron reaction for efficient H₂O₂ production.

利用多尺度氮化碳（PCN）从水和氧气中光催化生产H ₂ O ₂是一种耗能的蒽醌方法的有前途的替代方法。然而，不足的氧化电位和有限的光吸收限制了其进一步的改进。在此，通过2,5,8-三氨基-三-s-三嗪（蜜胺）和巴比妥酸（BA）的共聚制备具有足够的氧化电位和改善的可见光使用率（至多550 nm）的PCN。通过负载Na ₂ CoP ₂ O ₇作为水氧化助催化剂，该新型PCN系统的表观量子效率（420 nm）达到了创纪录的8.0％，日光化学转化效率为0.30％对于H ₂O ₂生产。这种改善归因于PCN矩阵中保留的C O基团引入的O 2p状态，从而导致最大价带为1.85 eV（相对于SHE）。BA和melem的共聚以及Na ₂ CoP ₂ O _7的加入也抑制了电荷的重组，导致快速的单电子到单电子的逐步反应，以有效地生产H ₂ O ₂。