2D Metal-Organic Framework Nanosheets based on Pd-TCPP as Photocatalysts for Highly Improved Hydrogen Evolution

Area of Science:

• Materials Science
• Catalysis
• Photochemistry

Background:

• Metal-organic frameworks (MOFs) are promising materials for catalysis.
• Single-atom catalysts offer high efficiency and selectivity.
• Photocatalytic hydrogen evolution is a key process for renewable energy.

Purpose of the Study:

• To fabricate and evaluate a 2D MOF nanosheet derived palladium single-atom catalyst (Pd-MOF).
• To investigate its performance in visible light photocatalytic hydrogen evolution reaction (HER).
• To compare its efficiency with related platinum-based MOFs (Pt-MOFs).

Main Methods:

• Fabrication of a 2D MOF nanosheet incorporating single palladium atoms.
• Testing the photocatalytic hydrogen evolution reaction under visible light irradiation.
• Comparative analysis of Pd-MOF and Pt-MOF performance, including hydrogen production rates.
• Investigation of underlying mechanisms for enhanced activity.

Main Results:

• The Pd-MOF demonstrated a remarkable H₂ production rate of 21.3 mmol/gh, significantly outperforming Pt-MOFs (6.6 mmol/gh).
• The enhanced activity was attributed to a longer lifetime of photogenerated electron-hole pairs and improved charge transfer efficiency.
• No significant differences were observed in the chemical environment of the metal center or spectral light absorption between Pd-MOF and Pt-MOF.

Conclusions:

• The developed Pd-MOF is a highly efficient catalyst for visible light photocatalytic hydrogen evolution.
• The superior performance is linked to optimized charge carrier dynamics within the MOF structure.
• This work highlights the potential of single-atom MOF catalysts for sustainable hydrogen production.