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Structural Regulation of Thiophene-Based Two-Dimensional Covalent Organic Frameworks toward Highly Efficient Photocatalytic Hydrogen Generation

Authors :
Liu, Hui
Zheng, Xuhan
Xu, Jie
Jia, Xu
Chao, Menghuan
Wang, Danbo
Zhao, Yingjie
Source :
ACS Applied Materials & Interfaces; April 2023, Vol. 15 Issue: 13 p16794-16800, 7p
Publication Year :
2023

Abstract

Two imine-based 2D covalent organic frameworks (COFs) with slight differences in their core structures are presented. The COF containing benzotrithiophene moieties with better planarity and π-conjugation (BTTh-TZ-COF) shows much better photocatalytic activity than the COF with trithienylbenzene cores (TThB-TZ-COF). Further photoelectrochemical study reveals the catalytic mechanism in more detail. Since other factors such as crystallinity, porosity, and optical bandgaps are equal, the different structures of the cores in the two similar COFs are the major contributors to the significantly different photocatalytic performance. The better electron delocalization of the planar trithiophene-based core and the enhanced D–A interactions between the triazine and trithiophene units in BTTh-TZ-COFcreate efficient charge separation and transfer, thus leading to superior photocatalytic hydrogen evolution activity. A new strategy for preparing high-performance organic photocatalysts for solar-energy conversion is revealed by this study.

Details

Language :
English
ISSN :
19448244
Volume :
15
Issue :
13
Database :
Supplemental Index
Journal :
ACS Applied Materials & Interfaces
Publication Type :
Periodical
Accession number :
ejs62589824
Full Text :
https://doi.org/10.1021/acsami.3c01154