State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China.
ChemSusChem. 2018 Feb 22;11(4):700-708. doi: 10.1002/cssc.201702278. Epub 2018 Feb 8.
As an amorphous or semicrystalline material, graphitic carbon nitride (g-C N ) 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-C N (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-C N . 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.
作为一种无定形或半结晶材料，石墨相氮化碳（g-C3N4）由于光生载流子的快速复合而表现出较差的光催化活性，这主要是由于石墨结构中存在高密度的缺陷所致。在这项工作中，通过在最终热缩合前的前体中引入一种新的水热处理，制备了具有高度有序结构的多孔 O 掺杂 g-C3N4（P-CNO）纳米片。P-CNO 的光催化析氢速率（HER）和比表面积的析氢速率分别比块状 g-C3N4高 13.9 和 1.7 倍。改进的光催化活性归因于 O 掺杂、多孔片状形貌和结晶度提高的协同效应。这项工作还为合成具有高结晶度和优异性能的其他聚合物基光催化剂提供了一种新方法。
