Herein, self-supported oxygen-doped carbon nitride aerogel (OCNA) was successfully fabricated through a facile self-assembly method combined with hydrothermal process, without adopting any harmful solvents or cross-linking agents. The fabrication mechanism of OCNA was discussed. OCNA exhibited much faster charge separation efficiency, longer carriers’ lifetime than bulk carbon nitride (BCN). More importantly, oxygen-doping led to a more negative conduction band (CB) position and narrower band gap (E_g). Hence, the spectral response range of OCNA was extended dramatically and the hydrogen evolution rate (HER) of OCNA (λ > 510 nm) was about 26 times as high as that of BCN prepared herein. OCNA exhibited a remarkable apparent quantum yield (AQY) of 20.42% at 380 nm, 7.43% at 420 nm and 1.71% at 500 nm, superior to most of the reported C₃N₄-based materials. This work paves a facile colloid chemistry strategy to assemble self-supported 3D CNA that could be widely adopted in the sustainability field.

在此，通过不依赖任何有害溶剂或交联剂的简便自组装方法与水热工艺相结合，成功制备了自支撑的氧掺杂氮化碳气凝胶（OCNA）。讨论了OCNA的制作机理。与本体氮化碳（BCN）相比，OCNA具有更快的电荷分离效率和更长的载流子寿命。更重要的是，氧掺杂导致更负的导带（CB）位置和更窄的带隙（E _g）。因此，OCNA的光谱响应范围得到了极大的扩展，OCNA的析氢速率（HER）（λ> 510 nm）是本文制备的BCN的约26倍。OCNA在380 nm处具有20.42％的显着量子产率（AQY），在420 nm处具有7.43％的显着量子产率，在500 nm处具有1.71％的显着量子产率，优于大多数报道的基于C ₃ N ₄的材料。这项工作为组装自支撑的3D CNA铺装了一种简便的胶体化学策略，该策略可在可持续性领域中广泛采用。