For efficient solar energy conversion, the morphology engineering of hollow graphitic carbon nitride (g-C₃N₄) is one of the promising approachs benefiting from abundant exposed active sites and short photocarrier transport distances, but is difficult to control on account of easy structural collapse. Herein, a facile supramolecular electrostatic self-assembly strategy has been developed for the first time to fabricate mesoporous thin-walled g-C₃N₄ microtubes (mtw-CNT) with shell thickness of ca. 13 nm. The morphological control of g-C₃N₄ enhances specific surface area by 12 times, induces stronger optical absorption, widens bandgap by 0.18 eV, improves photocurrent density by 2.5 times, and prolongs lifetimes of charge carriers from bulk to surface, compared with those of bulk g-C₃N₄. As a consequence, the transformed g-C₃N₄ exhibits the optimum photocatalytic H₂-production rate of 3.99 mmol·h⁻¹·g⁻¹ (λ > 420 nm) with remarkable apparent quantum efficiency of 8.7% (λ = 420 ± 15 nm) and long-term stability. Moreover, mtw-CNT also achieves high photocatalytic CO₂-to-CO selectivity of 96% (λ > 420 nm), much better than those on the most previously reported porous g-C₃N₄ photocatalysts prepared by the conventional hard-templating and soft-templating methods.

为了有效地转换太阳能，中空石墨碳氮化碳（gC ₃ N ₄）的形态工程学是受益于大量暴露的活性位点和较短的光载流子传输距离的有前途的方法之一，但由于结构容易崩溃，因此难以控制。本文中，首次开发了一种简便的超分子静电自组装策略，以制备壳厚度为约200nm的中孔薄壁gC ₃ N ₄微管（mtw-CNT）。13纳米 gC ₃ N ₄的形态控制与块状gC ₃ N ₄相比，可将比表面积提高12倍，诱导更强的光吸收，将带隙扩大0.18 eV，将光电流密度提高2.5倍，并延长电荷载流子从本体到表面的寿命。结果，转化的gC ₃ N ₄表现出最佳的光催化H _2产生速率，为3.99 mmol·h ^-1 ·g ^-1（λ> 420 nm），表观量子效率为8.7％（λ= 420±15） nm）和长期稳定性。此外，mtw-CNT还实现了96％（λ> 420 nm）的高光催化CO ₂ -CO选择性，比以前报道的大多数多孔gC更好通过常规的硬模板法和软模板法制备的₃ N ₄光催化剂。