Morphology regulation and electronic structure modulation are very important means to improve the photocatalytic H₂ evolution capability of the metal-free graphitic carbon nitride (g-C₃N₄) photocatalyst. Herein, we constructed a multiple ordered porous honeycomb structure g-C₃N₄ via a one-step chemical vapor deposition (CVD) method with the co-pyrolysis of melamine and glucose, involving the in-plane seamless splicing of the carbon ring (C_r) into the g-C₃N₄ lattice network (denoted as C_r–PHCN). The as-prepared C_r–PHCN exhibits a periodic honeycomb structure with a ∼300 nm inner diameter and ∼20 nm wall thickness. The multi-dimensional honeycomb architecture provides the concomitant advantages of enhanced light-harvesting ability, abundant active sites and short electron transport paths. Simultaneously, the seamless in-plane C_r splicing in triazine@C_r extends the π-conjugated systems, which contributes to a narrow band gap, improved electrical conductivity and a low electron–hole recombination rate. Accordingly, the average hydrogen evolution rate (HER) of C_r–PHCN reaches 7581 μmol h⁻¹ g⁻¹, around 47.4 times that of pure CN (160 μmol h⁻¹ g⁻¹), and its remarkable apparent quantum efficiency (AQE) reaches 10.62% at 420 nm. This work has successfully achieved the simultaneous morphology control and in-plane modification of high-performance g-C₃N₄ with high yield.

中文翻译：

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具有碳环平面拼接的多重有序多孔蜂窝 g-C3N4 用于出色的光催化制氢

形貌调控和电子结构调控是提高无金属石墨氮化碳(gC ₃ N ₄ )光催化剂光催化_析氢能力的重要手段。在此，我们通过一步化学气相沉积 (CVD) 方法与三聚氰胺和葡萄糖的共热解构建了多有序多孔蜂窝结构 gC ₃ N _{4 ，其中涉及碳环的平面内无缝拼接 (C r} ) 进入 gC ₃ N ₄晶格网络（表示为 C _r -PHCN）。准备好的 C _r -PHCN 呈现出周期性的蜂窝结构，内径约为 300 nm，壁厚约为 20 nm。多维蜂窝结构提供了增强的光捕获能力、丰富的活性位点和短的电子传输路径等优点。同时，三嗪@C r 中的无缝面内C r 拼接_扩展了_π共轭体系，这有助于窄带隙、提高电导率和低电子-空穴复合率。_{因此，C r} -PHCN的平均析氢速率 (HER)达到 7581 μmol h ^-1 g ^-1，约为纯 CN (160 μmol h ^-1 g ^{-1 ) 的 47.4 倍})，其显着的表观量子效率 (AQE) 在 420 nm 处达到 10.62%。该工作成功地实现了高性能gC ₃ N ₄的同时形貌控制和面内改性，产率高。