Structural amine-induced interfacial electrical double layers for efficient photocatalytic H₂ evolution

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Limited charge carrier separation hinders photocatalytic hydrogen evolution efficiency.
• Surface modification is a key strategy to improve photocatalyst performance.

Purpose of the Study:

• To engineer an electric double layer (EDL) on CdS for enhanced photocatalytic hydrogen evolution.
• To investigate the synergistic effects of diethylenetriamine (DETA) and platinum (Pt) on CdS performance.

Main Methods:

• Surface modification of CdS with positively charged diethylenetriamine (DETA) molecules.
• Anchoring of platinum (Pt) species onto the DETA-modified CdS surface (Pt/CdS-D).
• Evaluation of hydrogen evolution rates and apparent quantum efficiency.

Main Results:

• Pt/CdS-D exhibited a hydrogen evolution rate of 6295 μmol g⁻¹ h⁻¹, a 26.7-fold enhancement over bare CdS.
• Achieved an apparent quantum efficiency of 14.9% for photocatalytic hydrogen evolution.
• The EDL modification lowered activation energy and established directional charge transport, improving carrier separation.

Conclusions:

• Synergistic modification with DETA and Pt creates effective EDL-driven charge transport channels.
• This approach provides a new paradigm for designing high-performance photocatalysts for solar-to-hydrogen energy conversion.