兴奋剂
光激发
离解(化学)
光催化
材料科学
电子迁移率
载流子
能量转换效率
纳米技术
半导体
化学物理
光化学
光电子学
化学工程
化学
激发态
催化作用
原子物理学
物理化学
物理
有机化学
工程类
作者
Guiyang Yu,Ke Gong,Chuanwang Xing,Lan Hu,Haibin Huang,Lejie Gao,Debao Wang,Xiyou Li
标识
DOI:10.1016/j.cej.2023.142140
摘要
Organic semiconductor under photoexcitation could generate abundant strong-binding Frenkel excitons and inevitably suffer from low dissociation efficiency (<1%) and poor mobility ability, which severely suppresses the efficient utilization of photogenerated charges and corresponding activity. Herein, a dual P-doping strategy is proposed in bay and corner sites implanted polymeric carbon nitride (PCN-D) for visible-driven H2O2 production. The dual P doping breaks localized electron state around original symmetric heptazine units and weakens the binding energy between electrons and holes, increasing dissociation efficiency to reach 11.9% with 20-fold improvement. In addition, the conductivity ability of PCN-D, including formed carrier charge concentration and mobility, achieves 13-fold and 7-fold improvement, which facilitates the charge transfer and separation. The proposed dual doped-P-site strategy, with the blessing of porous structure, provides plentiful active center for effective adsorption and activation of O2 molecule, further accelerating reaction progress and achieving six-times increase of photocatalytic H2O2 production rate. This work provides in-depth insight into the importance of dual P-doping to optimize kinetic behavior of photogenerated charges and opens an avenue to the multiscale doping-modulation of semiconductor with high efficiency solar energy conversion.
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