In-situ construction of hydrazone-linked COF-based core-shell hetero-frameworks for enhanced photocatalytic hydrogen evolution
Engineering hetero-framework by using organic frameworks is expected to be a novel and effective strategy to facilitate the charge separation efficiency of photocatalysts. Herein, we construct the metal organic framework (MOF) @ covalent organic framework (COF) core-shell hetero-framework via in-situ growth of hydrazone-linked COF (TFPT-DETH) on the surface of octahedral NH2-UiO-66. The resultant hetero-frameworks exhibit high specific surface area with the co-existence of micropores and mesopores, extended light absorption, as well as the efficient exciton dissolution and transfer. The optimal sample with appropriate shell thickness about 20 nm achieves an excellent hydrogen evolution rate up to 7178 μmol g-1 h-1, which is approximately 3 and 7 times of pristine TFPT-DETH and its physically mixed counterpart, respectively. The concept of hetero-framework structure may stimulate the rational design of heterostructured photocatalysts and enlarge the family of organic photocatalysts in solar energy conversion and utilization.
- This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers