articleNature CommunicationsApr 29, 2022GOLD OA

Covalent organic frameworks with high quantum efficiency in sacrificial photocatalytic hydrogen evolution

Dalian Institute of Chemical Physics · Chinese Academy of Sciences · +1 more institution

PubMed
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Abstract

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…

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