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Molecular Engineering of Methylated Sulfone‐Based Covalent Organic Frameworks for Back‐Reaction Inhibited Photocatalytic Overall Water Splitting.

Authors :
Zhang, Xiang
Xiao, Zhiwei
Jiao, Lei
Wu, Huyue
Tan, Yan‐Xi
Lin, Jing
Yuan, Daqiang
Wang, Yaobing
Source :
Angewandte Chemie. 9/9/2024, Vol. 136 Issue 37, p1-8. 8p.
Publication Year :
2024

Abstract

Solar‐to‐hydrogen (H2) and oxygen (O2) conversion via photocatalytic overall water splitting (OWS) holds great promise for a sustainable fuel economy, but has been challenged by the backward O2 reduction reaction (ORR) with favored proton‐coupled electron transfer (PCET) dynamics. Here, we report that molecular engineering by methylation inhibits the backward ORR of molecular photocatalysts and enables efficient OWS process. As demonstrated by a benchmark sulfone‐based covalent organic framework (COF) photocatalyst, the precise methylation of its O2 adsorption sites effectively blocks electron transfer and increases the barrier for hydrogen intermediate desorption that cooperatively obstructs the PCET process of ORR. Methylation also repels electrons to the neighboring photocatalytic sulfone group that promotes the forward H2 evolution. The resultant DS‐COF achieves an impressive inhibition of about 70 % of the backward reaction and a three‐fold enhancement of the OWS performance with a H2 evolution rate of 124.7 μmol h−1 g−1, ranking among the highest reported for organic‐based photocatalysts. This work provides insights for engineering photocatalysts at the molecular level for efficient solar‐to‐fuel conversion. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00448249
Volume :
136
Issue :
37
Database :
Academic Search Index
Journal :
Angewandte Chemie
Publication Type :
Academic Journal
Accession number :
179393518
Full Text :
https://doi.org/10.1002/ange.202408697