As an amorphous or semicrystalline material, graphitic carbon nitride (g‐C₃N₄) displays poor photocatalytic activity owing to rapid recombination of the photogenerated charge carriers, which is mainly caused by a high density of defects in the graphitic structure. In this work, a porous O‐doped g‐C₃N₄ (P‐CNO) nanosheet with a highly ordered architecture is fabricated by introducing a novel hydrothermal treatment to the precursor before the final thermal condensation. The photocatalytic hydrogen evolution rate (HER) and HER per surface area of P‐CNO are 13.9 and 1.7 times higher than that of bulk g‐C₃N₄. The improved photocatalytic activity is ascribed to a synergistic effect of O doping, a porous sheet‐like morphology, and increased crystallinity. This work also provides a new approach for the synthesis of other polymer‐based photocatalysts with high crystallinity and excellent performance.

中文翻译：

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具有高度有序结构和增强的光催化活性的石墨化氮化碳的水热诱导氧掺杂

作为无定形或半结晶材料，石墨碳氮化物（g-C ₃ N ₄）由于光生电荷载流子的快速复合而显示出较差的光催化活性，这主要是由石墨结构中缺陷的高密度引起的。在这项工作中，通过在最终热缩合之前在前体中引入新颖的水热处理来制造具有高度有序结构的多孔O掺杂g-C ₃ N ₄（P-CNO）纳米片。P-CNO的单位表面积的光催化氢逸出速率（HER）和HER分别比本体g-C ₃ N ₄高13.9和1.7倍。改善的光催化活性归因于O掺杂，多孔片状形态和增加的结晶度的协同效应。这项工作还为合成具有高结晶度和出色性能的其他基于聚合物的光催化剂提供了一种新方法。