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Iron Polypyridyl Complexes for Photocatalytic Hydrogen Generation
Carolyn L Hartley1, Ryan J DiRisio1, Megan E Screen1
1Department of Chemistry, College of William and Mary , 540 Landrum Drive, Williamsburg, Virginia 23185, United States.
Inorganic Chemistry
|August 23, 2016
Summary
Iron(III) complexes were integrated into a photocatalytic system for efficient hydrogen production. This system demonstrates high activity and stability, achieving over 2100 turnovers in 24 hours.
Area of Science:
- Inorganic Chemistry
- Photocatalysis
- Green Chemistry
Background:
- Fe(III) complexes show promise as electrocatalysts for hydrogen production.
- Developing efficient photocatalytic systems is crucial for sustainable hydrogen fuel generation.
Purpose of the Study:
- To incorporate Fe(III) electrocatalysts into a photocatalytic system for hydrogen evolution.
- To evaluate the activity and stability of the novel photocatalytic system.
Main Methods:
- Utilizing Fe(III) complexes as catalysts, fluorescein as a chromophore, and triethylamine as a sacrificial electron donor.
- Conducting photocatalysis in a 1:1 ethanol:water mixture.
- Analyzing hydrogen evolution and catalyst stability over 24 hours.
Main Results:
- Hydrogen evolution was successfully achieved using the Fe(III)-based photocatalytic system.
- The system exhibited high activity, reaching turnover numbers (TONs) greater than 2100.
- The photocatalytic process demonstrated excellent stability over a 24-hour period.
- A quantum yield exceeding 3% was recorded for the hydrogen production.
Conclusions:
- The integration of Fe(III) electrocatalysts into a photocatalytic system is effective for hydrogen production.
- The developed system offers a highly active and stable platform for sustainable hydrogen generation.
- The catalytic mechanism involves a reductive quenching pathway.
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