Issue 47, 2023

Hollow sp2-conjugated covalent organic framework encapsulating thiophene-based photosensitizer for enhanced visible-light-driven hydrogen evolution

Abstract

Vinylene-linked sp2-conjugated covalent organic frameworks (COFs) have gained increasing attention for photocatalytic hydrogen evolution owing to their high degree of in-plane π-conjugation and exceptional stability. However, the photocatalytic activity of vinylene-linked COFs is restricted due to the low exciton dissociation efficiency and wide band gap. Herein, a novel Z-scheme heterostructure g2T-T@HCOFs was fabricated through the hybridization of vinylene-linked sp2 conjugated COFs with a hollow structure and thiophene-based photosensitizer (g2T-T) using a template method and post-encapsulating modification. The hollow-structured HCOFs enabled uniform encapsulation of the g2T-T both within their channels and on their surfaces, which facilitates the formation of a firm and stable interface between n-type HCOF and p-type g2T-T. Therefore, the encapsulation of g2T-T enables the realization of a Z-scheme pathway for efficient charge separation and transfer, leading to enhanced electron accumulation within the HCOFs during water splitting. Consequently, the obtained Z-scheme heterostructure g2T-T@HCOFs exhibited a remarkable 5.5-fold enhancement in their visible-light-induced hydrogen evolution activity compared to the pristine COF and long-term stability arising from their stable double carbon bonds and hollow spherical structure. This work provides a successful strategy to construct morphology-controllable sp2-conjugated COFs and hollow shell–core Z-scheme photocatalysts for high-performance water splitting.

Graphical abstract: Hollow sp2-conjugated covalent organic framework encapsulating thiophene-based photosensitizer for enhanced visible-light-driven hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
26 ربيع الأول 1445
Accepted
22 ربيع الثاني 1445
First published
22 ربيع الثاني 1445

J. Mater. Chem. A, 2023,11, 25899-25909

Hollow sp2-conjugated covalent organic framework encapsulating thiophene-based photosensitizer for enhanced visible-light-driven hydrogen evolution

C. Yang, H. Hu, C. Qian and Y. Liao, J. Mater. Chem. A, 2023, 11, 25899 DOI: 10.1039/D3TA06192B

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