光催化
氮化碳
桥接(联网)
可见光谱
异质结
载流子
材料科学
氮化物
纳米技术
光电子学
碳纤维
化学工程
光化学
化学
催化作用
复合数
计算机科学
有机化学
工程类
复合材料
计算机网络
图层(电子)
作者
Dong Liu,Shengtao Chen,Yuexing Zhang,Renjie Li,Tianyou Peng
标识
DOI:10.1016/j.apcatb.2023.122805
摘要
Carbon nitrides have attracted broad attention in the field of photocatalytic H2 evolution. However, the design and preparation of carbon nitrides with highly efficient charge separation and transfer are still challenging. Here, we synthesized a novel heptazine derivative-based photocatalyst, named as M+U-x to overcome the inherent limitations of carbon nitrides (C3N4 and C3N5). Experimental and theoretical calculation results reveal that the resultant M+U-x is composed by electron-withdrawing C3N4 and electron-donating C3N5 moieties, which are integrated into the conjugated framework via N-atoms and azo bridging units to form molecular heterojunctions. Among these, M+U-3 can dramatically facilitate the spatial separation of photoinduced charge carriers, delivering significantly high visible-light-responsive H2 evolution activity of 372 μmol h−1 with an AQY of 21.6% at 400 nm. This work provides a novel strategy for rationally modulating the bridging units of carbon nitrides to acquire enhanced charge-carrier mobility and efficient photocatalytic H2 evolution from the molecular level.
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