Melem is the basic structural unit of g-CN. When directly utilized as a photocatalyst, the separation efficiency of photogenerated electron-hole pairs is low. In this study, we constructed a Melem-based all-organic heterojunction (PICN) by reacting the -NH at the terminal of the Melem unit with the anhydride of PDA. The photocatalytic efficiency for HO production of the heterojunction is 4.2 times that of CN. Introducing -Cl at the bay position of PDI further enhances the photocatalytic HO production efficiency by 1.6 times. This enhancement is attributed to the introduction of -Cl, which not only broadens the UV–visible light absorption range of the sample but also improves the interface electron transfer efficiency between Melem and PDICl. Moreover, the introduction of -Cl can also reduce the overpotential of the O reduction reaction on the surface of the sample. These novel findings may provide insights for the design of organic heterojunction photocatalysts.

中文翻译：

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用于优异光催化 H2O2 合成的全有机异质结：湾位 Cl 在 PDI 中的关键作用


Melem是g-CN的基本结构单元。直接用作光催化剂时，光生电子-空穴对的分离效率较低。在这项研究中，我们通过Melem单元末端的-NH与PDA的酸酐反应构建了基于Melem的全有机异质结（PICN）。异质结光催化生产H2O的效率是CN的4.2倍。在PDI的海湾位置引入-Cl使光催化H2O生产效率进一步提高1.6倍。这种增强归因于-Cl的引入，它不仅拓宽了样品的紫外-可见光吸收范围，而且提高了Melem和PDICl之间的界面电子转移效率。此外，-Cl的引入还可以降低样品表面O还原反应的过电势。这些新颖的发现可能为有机异质结光催化剂的设计提供见解。