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Linker engineering in metal-organic frameworks for dark photocatalysis
Yating Pan1, Jingxue Wang1, Shengyi Chen2
1Department of Chemistry, University of Science and Technology of China Hefei Anhui 230026 P. R. China jianglab@ustc.edu.cn.
Chemical Science
|June 27, 2022
Summary
This study introduces metal-organic frameworks (MOFs) capable of dark photocatalysis for hydrogen production. Functional groups on MIL-125 MOFs tune dark catalytic activity by influencing Ti3+ intermediates.
Area of Science:
- Materials Science
- Photocatalysis
- Renewable Energy
Background:
- Natural photosynthesis involves dark reactions crucial for energy storage.
- Artificial photocatalysts typically require continuous light, limiting their application.
- Dark photocatalysis in artificial systems remains underexplored.
Purpose of the Study:
- To investigate the potential of metal-organic frameworks (MOFs) for dark photocatalysis.
- To explore dark hydrogen production capabilities using a Ti-based MOF, MIL-125.
- To understand how functional group modifications affect dark photocatalytic activity.
Main Methods:
- Synthesis of functionalized MIL-125 metal-organic frameworks (MIL-125-X, X = NH2, NO2, Br).
- Evaluation of dark photocatalytic hydrogen production efficiency.
- Dynamic and thermodynamic investigations of reaction intermediates.
Main Results:
- MIL-125 demonstrated dark photocatalytic hydrogen production.
- Functionalization with different groups (NH2, NO2, Br) significantly altered hydrogen production rates.
- Ti3+ intermediate production and lifetime were identified as key factors, influenced by electron-donating/withdrawing effects of functional groups.
Conclusions:
- This work presents the first report of dark photocatalysis in MOFs.
- MIL-125 MOFs show promise for storing irradiation energy and enabling dark hydrogen production.
- MOF diversity offers a promising avenue for developing advanced dark photocatalysts.
