光催化
激子
离解(化学)
材料科学
氮化碳
压电
极化(电化学)
电子
动力学
光化学
化学物理
化学
纳米技术
光电子学
催化作用
凝聚态物理
物理化学
物理
复合材料
生物化学
量子力学
作者
Haotian Tan,Wenping Si,Wei Peng,Xin Chen,Xiaoqing Liu,Yong You,Liqun Wang,Feng Hou,Ji Liang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-11-06
卷期号:23 (22): 10571-10578
被引量:8
标识
DOI:10.1021/acs.nanolett.3c03466
摘要
Two-dimensional (2D) carbon nitride (CN) materials have received tremendous attention as photocatalysts for clean energy and environmental treatment. However, the photocatalytic efficiency of CN is constrained by the high exciton binding energy and sluggish charge kinetics due to weak dielectric screening, impeding the overall process. Herein, localized flexo-/piezoelectric polarization is introduced via strain engineering, boosting exciton dissociation and promoting charge separation to enhance the multielectron photocatalytic process. Consequently, the exciton binding energy of polarized CN is reduced from 52 to 34 meV, and the hydrogen evolution yield increased by 2.9 times compared to that of the pristine CN. For other photocatalytic reactions (e.g., H2O2 production), the polarized CN also maintained a 2.1-fold increase compared to the pristine CN. This strategy of inducing localized polarization via strain engineering provides new insights for boosting photocatalytic reactions involving electrons.
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