光催化
材料科学
载流子
光化学
共价键
纳米片
超快激光光谱学
接受者
离解(化学)
半导体
激子
纳米技术
催化作用
化学物理
光谱学
化学
光电子学
物理化学
有机化学
物理
量子力学
凝聚态物理
作者
Chunzhi Li,Jiali Liu,He Li,Kaifeng Wu,Junhui Wang,Qihua Yang
标识
DOI:10.1038/s41467-022-30035-x
摘要
Abstract Organic semiconductors offer a tunable platform for photocatalysis, yet the more difficult exciton dissociation, compared to that in inorganic semiconductors, lowers their photocatalytic activities. In this work, we report that the charge carrier lifetime is dramatically prolonged by incorporating a suitable donor-acceptor (β-ketene-cyano) pair into a covalent organic framework nanosheet. These nanosheets show an apparent quantum efficiency up to 82.6% at 450 nm using platinum as co-catalyst for photocatalytic H 2 evolution. Charge carrier kinetic analysis and femtosecond transient absorption spectroscopy characterizations verify that these modified covalent organic framework nanosheets have intrinsically lower exciton binding energies and longer-lived charge carriers than the corresponding nanosheets without the donor-acceptor unit. This work provides a model for gaining insight into the nature of short-lived active species in polymeric organic photocatalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI