期刊
ADVANCED ENERGY MATERIALS
卷 13, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202203695
关键词
charge separation; exciton dissociation; Ni-intercalated COFs; photocatalytic hydrogen evolution; polarization electric field
Covalent organic frameworks (COFs) have attracted significant interest in the field of photocatalytic hydrogen evolution due to their well-defined structures and tailor-made function. However, the excitonic effects resulting from Coulomb interactions are often overlooked, which are crucial for the rate-determining processes. Therefore, it is important and challenging to explore new routes for modulating excitonic dissociation in COFs for enhancing photocatalysis.
Covalent organic frameworks (COFs) as appealing platforms have received tremendous interest in the field of photocatalytic H-2 evolution owing to their well-defined structures and tailor-made function. However, excitonic effects resulting from Coulomb interactions between electron-hole pairs are key rate-determining processes in photocatalytic hydrogen evolution, which are usually ignored. Thus, it is of profound significance and highly desired, but it is still a challenge, to explore new routes to modulate excitonic dissociation in COFs for boosting photocatalysis. To address this challenge, Ni-intercalated fluorenone-based COFs (Ni-COF-SCAU-1) at the imine linkage, are proposed for the first time, and demonstrated to exhibit the enhanced polarization electric field; thus, facilitating the Hall electron mobility and the dissociation of singlet excitons into free charge carriers under photoexcitation to participate in the surface hydrogen evolution reaction. Benefiting from these results, Ni-COF-SCAU-1 displays a hydrogen production rate of 197.46 mmol center dot g(-1) h(-1) under visible light irradiation with an apparent quantum efficiency (AQE) up to 43.2% at 420 nm. This work offers an in-depth understanding of the crucial role of the interlayer atomic interface in improving photocatalytic hydrogen evolution and paves a new way for excitonic regulation in the COFs.
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