Journal
NANOMATERIALS
Volume 12, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nano12050890
Keywords
graphitic carbon nitride; metal-organic cage; direct Z-scheme photocatalyst; H-2 evolution; water splitting
Categories
Funding
- National Natural Science Foundation Project of China [21975291, 21572280, 6177050974]
- NSF of Guangdong Province [2019A1515011640, 2020A1515110474]
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In this study, a visible-light-driven photocatalyst for hydrogen generation was successfully synthesized by combining metal-organic cages with other solid materials. The optimized material structure improved charge separation and transfer efficiency, leading to excellent catalytic performance.
The demand for improving the activity, durability, and recyclability of metal-organic cages (MOCs) that work as photocatalytic molecular devices in a homogeneous system has promoted research to combine them with other solid materials. An M2L4 type photosensitive metal-organic cage MOC-Q2 with light-harvesting ligands and catalytic Pd2+ centers has been synthesized and further heterogenized with graphitic carbon nitride to prepare a robust direct Z-scheme heterojunction photocatalyst for visible-light-driven hydrogen generation. The optimized g-C3N4/MOC-Q2 (0.7 wt%) sample exhibits a high H-2 evolution activity of 6423 mu mol g(-1) h(-1) in 5 h, and a total turnover number of 39,695 after 10 h, significantly superior to the bare MOC-Q2 used in the homogeneous solution and the comparison sample Pd/g-C3N4/L-4. The enhanced performances of g-C3N4/MOC-Q2 can be ascribed to its direct Z-scheme heterostructure, which effectively improves the charge separation and transfer efficiency. This work presents a rational approach of designing a binary photocatalytic system through combing micromolecular MOCs with heterogeneous semiconductors for water splitting.
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