光催化
材料科学
杂原子
聚合
电子顺磁共振
光化学
热稳定性
氮化碳
化学工程
纳米技术
催化作用
化学
戒指(化学)
聚合物
核磁共振
有机化学
复合材料
工程类
物理
作者
Yang Zhang,N. Cao,Xiaoming Liu,Fengting He,Bin Zheng,Chaocheng Zhao,Yongqiang Wang
标识
DOI:10.1007/s40843-022-2345-1
摘要
Graphite carbon nitride (g-C3N4) has become an emerging metal-free photocatalyst and attracted the attention of researchers. However, pure g-C3N4 (PCN) prepared by traditional thermal condensation polymerization has a low polymerization of heptazine ring chains and a large number of charge recombination centers, which hinder in-plane charge transport, leading to undesirable photocatalytic performance. Herein, PCN fabrication by thermal treatment with ammonium oxalate monohydrate was performed to produce highly dispersed porous g-C3N4 nanosheets, and the integrity of their in-plane heptazine ring chains was successfully improved without introducing heteroatoms. Electron paramagnetic resonance and 13C nuclear magnetic resonance analyses revealed significantly increased electron density and delocalization of the π-conjugated structure. The obtained samples exhibited acceptable stability and photocatalytic activity, and the hydrogen reduction rates without and with the Pt co-catalyst were 11.2 and 5.3 times that of PCN.
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