光催化
石墨氮化碳
化学
掺杂剂
催化作用
氮化碳
光化学
制氢
过氧化氢
碳纤维
化学工程
纳米技术
材料科学
有机化学
光电子学
兴奋剂
复合数
工程类
复合材料
作者
Dan Zheng,Yaorong Su,Da Wen,Zheng Zhang,Peiyi Yang,Xinyuan Ma,Yewang Chen,Liwei Deng,Shuang Zhou,Aiyun Meng
标识
DOI:10.1016/j.jcat.2023.115180
摘要
The production of hydrogen peroxide (H2O2) through visible photocatalytic molecular oxygen has gained significant attention as an environmentally friendly and sustainable approach. In this study, a unique multivariate modified graphitic carbon nitride (g-C3N4) photocatalyst is designed and successfully synthesized by incorporating K and I species as heteroatomic co-dopant, along with the defect engineering in g-C3N4. The resulting photocatalyst consists of particles ranging in size from 50 to 200 nm. Experimental results reveal that K atoms form chemical bonds with N atoms in adjacent layers, facilitating enhanced electron migration. On the other hand, I atoms predominantly localize at the edges of g-C3N4 building blocks, contributing to the formation of cyano groups (CN). These cyano groups, acting as nitrogen defects, can effectively narrow the band gap, elevate the conduction band, and effectively improve the generation and transport of photoexcited charge carriers. By precisely controlling the proportion of KI, the formation of cyanide can be effectively regulated. Notably, the obtained photocatalyst exhibits a remarkably high H2O2 yield of 4386.4 μΜ h−1 under visible light, surpassing that of g-C3N4 and other g-C3N4-based photocatalysts. This work presents a novel design strategy for the development of highly efficient photocatalysts for H2O2 production.
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