光催化
吡咯
制氢
氢
光化学
氮气
碳纤维
材料科学
可见光谱
兴奋剂
吡啶
石墨
无机化学
催化作用
化学
有机化学
光电子学
复合材料
复合数
作者
Shuaiyang Zhang,Mengjie Gao,Yunpu Zhai,Jiaqi Wen,Jingkun Yu,Tiwei He,Zhenhui Kang,Siyu Lu
标识
DOI:10.1016/j.jcis.2022.04.165
摘要
Recently, g-C3N4 (CN) loaded N-doped carbon dots (NCDs) have been widely studied as promising metal-free photocatalysts due to their impressive performance in hydrogen production. However, deep understanding of the effect of nitrogen chemical states on photocatalytic activity is still lacked. In this work, NCDs doped with pyrrole nitrogen, graphite/pyrrole nitrogen, and pyrrole/pyridine nitrogen were prepared and hybridized with g-C3N4. The characterizations revealed that, incorporation of pyrrole N-doped CDs into g-C3N4 (CN/NCDs-en) effectively enhanced the visible light absorption, facilitated electron-hole separation, and promoted the participation of photoexcited electrons in H2 evolution reaction. Moreover, theoretical calculation showed that, compared with graphite N and pyridine N, pyrrole N has the most appropriate H adsorption ability, which is conducive to the H2 formation. Under visible light irradiation, the CN/NCDs-en exhibited the best hydrogen evolution of 3028 μmol h-1 g-1. These results shed a light on the design and optimization of N-doped metal-free photocatalysts for H2 evolution reaction.
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