Nanoplasmonically Engineered Interfaces on Amorphous TiO₂ for Highly Efficient Photocatalysis in Hydrogen Evolution

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Nanoplasmonic photocatalysis efficiency is highly dependent on the spacing between metal nanoparticles (NPs) and semiconductor materials.
• Amorphous titanium dioxide (TiO2) exhibits limited photocatalytic activity due to high defect density.
• Ethylene glycol (EG) is explored as a potential interface spacer material.

Purpose of the Study:

• To investigate the role of ethylene glycol (EG) as an interface spacer in Ag NP-TiO2 composites for photocatalysis.
• To synthesize and characterize Ag NPs with EG-stabilized amorphous TiO2 (Ag/TiO2-3) via light-induced reduction.
• To elucidate the mechanism behind enhanced photocatalytic activity in the developed composite.

Main Methods:

• Facile light-induced reduction for synthesizing Ag/TiO2-3 composite.
• Controlled synthesis at pH 3.
• Characterization of compositional, structural, and optical properties.
• Evaluation of photocatalytic activity for hydrogen evolution under visible light.

Main Results:

• EG spacers facilitate optimal geometric arrangement, stabilizing Ag NPs and TiO2 while ensuring efficient energy transfer.
• The synthesized Ag/TiO2-3 composite exhibits remarkably high photocatalytic efficiency for hydrogen evolution.
• Amorphous TiO2 alone shows minimal catalytic activity, highlighting the synergistic effect of Ag NPs and EG spacers.

Conclusions:

• Ethylene glycol is an effective interface spacer for nanoplasmonic photocatalysts, enhancing hydrogen evolution.
• The Ag/TiO2-3 composite demonstrates superior performance compared to bare amorphous TiO2.
• The study provides insights into the mechanism of enhanced photocatalysis through controlled NP-semiconductor spacing.