Synergistic Light-Ultrasound-Driven Hydrogen Production by Hydrogen Iodide Decomposition Over Dual-Molecular...

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Emerging catalytic systems for hydrogen production face challenges like band mismatch and charge recombination.
• Molecular ferroelectrics show promise but suffer from low carrier separation and poor multi-field coupling.

Purpose of the Study:

• To develop a molecular engineering strategy using dual molecular ferroelectric heterojunctions.
• To address low carrier separation efficiency and improve multi-field coupling in catalysts.

Main Methods:

• One-pot solution synthesis of a dual molecular ferroelectric heterojunction: (4,4-DFPD)2PbI4/(4,4-DFCHA)2PbI4.
• Hydrogen iodide (HI) decomposition under simultaneous light and ultrasonic activation.
• Characterization using Kelvin probe force microscopy (KPFM).

Main Results:

• Achieved a hydrogen evolution rate of 5.26 mmol g⁻¹ h⁻¹, significantly outperforming individual components.
• Demonstrated efficient charge separation at the heterointerface due to energy-level alignment and polarization coupling.
• Confirmed suppressed charge recombination and enhanced charge migration via synergistic ferroelectric and piezoelectric fields.

Conclusions:

• The dual molecular ferroelectric heterojunction strategy is effective for high-efficiency piezo-photocatalytic systems.
• Interfacial charge dynamics play a critical role in optimizing catalytic performance.
• Provides insights for designing next-generation solar-driven catalysts.