Novel stable metal-organic framework photocatalyst for light-driven hydrogen production

A novel MOF formulated as [Dy 2 (abtc)(H 2 O) 2 (OH) 2 ]·2H 2 O (H 4 abtc = 3,3′,5,5′-azobenzene tetracarboxylic acid) was successfully synthesized, in which a dye-like ligand was integrated as a photosensitizer into MOFs by the reaction with Dy 3+ ions (dye-based Dy-MOF). The ultra-stable dye-based...

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Bibliographic Details
Published in:CrystEngComm 2018, Vol.2 (23), p.3228-3233
Main Authors: Yu, Qi, Dong, Hong, Zhang, Xin, Zhu, Ya-Xin, Wang, Jian-Hui, Zhang, Feng-Ming, Sun, Xiao-Jun
Format: Article
Language:English
Subjects:
Catalysis
Catalytic activity
Dyes
Hydrogen
Hydrogen evolution
Hydrogen production
Ligands
Metal-organic frameworks
Molecular orbitals
Photocatalysis
Photocatalysts
Stability
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Summary:A novel MOF formulated as [Dy 2 (abtc)(H 2 O) 2 (OH) 2 ]·2H 2 O (H 4 abtc = 3,3′,5,5′-azobenzene tetracarboxylic acid) was successfully synthesized, in which a dye-like ligand was integrated as a photosensitizer into MOFs by the reaction with Dy 3+ ions (dye-based Dy-MOF). The ultra-stable dye-based Dy-MOF possesses a HOMO-LUMO gap of 2.17 eV as determined by UV-vis spectrum with absorbed edge at 570 nm. The dye-based Dy-MOF shows high catalytic activity for the UV-vis light driven hydrogen production, attributed to the porous structure and light harvesting from the dye-like ligand. The band-edge positions of the crystals of the dye-based Dy-MOF were studied via cyclic voltammetry (CV) to further verify the principle of photocatalytic hydrogen production. Furthermore, the exceptional thermal and pH stability of the dye-based Dy-MOF makes it possible to use them as photocatalysts in water. On using Pt cocatalyst, the UV-vis light photocatalytic hydrogen evolution rate of the dye-based Dy-MOF reaches 21.53 μmol h −1 g −1 . In addition, the as-prepared dye-based Dy-MOF materials also exhibited good stability and recycling performance. A novel stable Dye-based Dy-MOF exhibits efficient photocatalytic activity for hydrogen generation.
ISSN:1466-8033
1466-8033
DOI:10.1039/c8ce00386f