标题：Effect of the intra- and inter-triazine N-vacancies on the photocatalytic hydrogen evolution of graphitic carbon nitride
作者：Li, Huiliang; Jin, Cui; Wang, Zeyan; Liu, Yuanyuan; Wang, Peng; Zheng, Zhaoke; Whangbo, Myung-Hwan; Kou, Liangzhi; Li, Yingjie; Dai, 更多 作者机构：[Li, Huiliang; Wang, Zeyan; Liu, Yuanyuan; Wang, Peng; Zheng, Zhaoke; Whangbo, Myung-Hwan; Huang, Baibiao] Shandong Univ, State Key Lab Crystal Mat, J 更多
通讯作者：Wang, Zeyan;Wang, ZY;Huang, BB
通讯作者地址：[Wang, ZY; Huang, BB]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.
来源：CHEMICAL ENGINEERING JOURNAL
关键词：Graphitic carbon nitride; N-vacancy; Hydrogen evolution from water;; Visible-light photocatalyst
摘要：We developed a new method to introduce N-vacancies of graphitic carbon nitride (GCN, typically in the Melon structure) at the inter-triazine sites and investigated how the visible-light photocatalytic H-2 evolution of GCN is affected by the N-vacancies at the intra- and inter-triazine sites of GCN. Theoretical and experimental results show that these N-vacancies of GCN create singly-occupied defect states within the band gap acing as a trap for photogenerated electrons and act as the reaction sites for H+ reduction. Compared with the intra-triazine N-vacancy, the inter-triazine N-vacancy exhibits stronger electron localization leading to a more efficient H-2 evolution. The photocatalytic reaction rate of GCN with inter-triazine N-vacancies is 9 times higher than that of "defect free" GCN, and 2.2 times higher normalized reaction rates than GCN with intra-triazine N-vacancies. The catalysis mechanism and the method to prepare melon with inter-triazine N-vacancies can be extended to explore new photocatalysts with high activities.