Broadband light absorption and excellent charge separation/migration efficiency are two important indicators for promising photocatalyst. However, realizing the above two aspects simultaneously is still a challenge. Here, an ultrathin and broadband carbon nitride (UBCN) is synthesized via a short‐time thermal oxidation process. The as‐prepared UBCN exhibits outstanding photocatalytic H₂ generation activity (240.60 μmol h⁻¹) under irradiation with λ>400 nm. Moreover, UBCN can work under irradiation with a longer wavelength (λ>500 nm), the corresponding H₂ evolution rate is 5.08 μmol h⁻¹, which is 14.8 times higher than that of bulk carbon nitride (Bulk CN). The excellent photocatalytic performance should be credited to the efficient charge separation/migration (the ultrathin structure) and the extended light absorption range. This work provides a simple and convenient strategy to prepare broadband and ultrathin metal‐free photocatalytic materials.

中文翻译：

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超薄和宽带氮化碳的短时热氧化，可高效产生光催化氢气

宽带光吸收和优异的电荷分离/迁移效率是有前途的光催化剂的两个重要指标。然而，同时实现以上两个方面仍然是一个挑战。在这里，通过短时热氧化工艺合成了超薄宽带氮化碳（UBCN）。制备的UBCN在λ> 400 nm的辐射下具有出色的光催化H ₂生成活性（240.60μmolh ^-1）。此外，UBCN可以在更长波长（λ> 500 nm）的辐射下工作，相应的H ₂释放速率为5.08μmolh ^-1，这是整体氮化碳（Bulk CN）的14.8倍。优异的光催化性能应归因于有效的电荷分离/迁移（超薄结构）和扩展的光吸收范围。这项工作为制备宽带和超薄的无金属光催化材料提供了一种简便的策略。