Molecular Triazine–Heptazine Junctions Promoting Exciton Dissociation for Overall Water Splitting with Visible Light,The Journal of Physical Chemistry C

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Molecular Triazine–Heptazine Junctions Promoting Exciton Dissociation for Overall Water Splitting with Visible Light
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-04-28 , DOI: 10.1021/acs.jpcc.1c02274
Zhiming Pan _{1,

2} , Minghui Liu ₁ , Guigang Zhang ₁ , Hangyu Zhuzhang ₁ , Xinchen Wang ₁

Affiliation

The Frenkel exciton dissociation efficiency and the subsequent free charge carrier migration rate mainly determine the photocatalytic property of polymeric carbon nitride (PCN). Herein, by postcalcination of heptazine-based PCN in molten salts at mild temperature (673 K), we are able to design a series of crystalline PCNs with a promising triazine–heptazine hybrid structure. The molecular triazine–heptazine junctions promote the exciton splitting, while the ordered in-plane packing structure facilitates the hot charge carrier migration. Accordingly, the optimal triazine–heptazine-based PCN exhibits a dramatically enhanced activity toward one-step excitation photocatalytic overall water splitting to generate H₂ and O₂ with visible light over heptazine-based pristine PCN, by a factor of ∼34 times.

中文翻译：

分子三嗪-庚嗪连接促进激子离解，使可见光下的总水分解

Frenkel激子的解离效率和随后的自由电荷载流子迁移速率主要决定了聚合氮化碳（PCN）的光催化性能。在此，通过在适中的温度（673 K）下对熔融盐中的庚嗪基PCN进行后煅烧，我们能够设计出一系列具有前途的三嗪-庚嗪杂化结构的结晶PCN。分子三嗪-庚嗪连接促进了激子分裂，而有序的面内堆积结构则促进了热载流子的迁移。因此，最佳的基于三嗪-庚嗪的PCN对一步激发光催化总水分解产生H ₂和O _2的活性显着增强。在基于庚嗪的原始PCN上具有可见光，约为34倍。

更新日期：2021-05-13

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