Limited by the intrinsic graphitic sp²-hybridized array of tri-s-triazine repeating units and inert stack of layers, the insertion of intercalant between layers of graphitic carbon nitride (CN) could be an effective way to strengthen the van der Waals force between adjoining layers and induce the charge redistribution in CN for the improvement of photocatalysis. This review summarizes the latest progress related to the design and construction of alkali/alkaline-earth metal intercalated CN, including (a) single alkali/alkaline-earth metal intercalated CN, (b) alkali/alkaline-earth metal and non-metallic species co-intercalated CN, (c) alkali/alkaline-earth metal intercalated and surface modification co-functionalized CN. The promotion mechanism of each classification will be critically discussed, namely alkali/alkaline-earth metal intercalated CN-induced charge redistribution facilitates the adsorption and activation of reactants, accelerates the separation efficiency of photogenerated carriers, and optimizes the reaction pathway. Also, the influence on band structure and optical property has been discussed with the intercalation of alkali/alkaline-earth metal. Finally, this mini-review highlights crucial issues that should be addressed in future research.

受本征石墨 sp ^{2 的限制}-三-s-三嗪重复单元的杂化阵列和惰性层堆叠，在石墨氮化碳（CN）层之间插入嵌入剂可能是加强相邻层之间的范德华力并诱导电荷重新分布的有效方法在 CN 中用于改善光催化。本综述总结了碱/碱土金属插层CN设计和构建的最新进展，包括（a）单种碱/碱土金属插层CN，（b）碱/碱土金属和非金属种共插层 CN，(c) 碱/碱土金属插层和表面改性共功能化 CN。将批判性地讨论每个分类的促进机制，即碱/碱土金属插层CN诱导的电荷重新分布有利于反应物的吸附和活化，加快光生载流子的分离效率，优化反应途径。此外，还讨论了碱/碱土金属插层对能带结构和光学性能的影响。最后，这篇简短的评论强调了未来研究中应该解决的关键问题。