Optimizing Carbon Dot-TiO₂ Nanohybrids for Enhanced Photocatalytic Hydrogen Evolution.

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• Photocatalytic hydrogen production is a key technology for sustainable energy.
• Carbon dots (CDs) and titanium dioxide (TiO2) are promising materials for photocatalysis.
• Developing efficient and stable photocatalysts is crucial for practical applications.

Purpose of the Study:

• To synthesize and characterize novel carbon dots/titanium dioxide (CDs/TiO2) nanohybrids.
• To evaluate their performance for hydrogen production from aqueous media under simulated solar light.
• To optimize synthesis conditions for enhanced photocatalytic activity and stability.

Main Methods:

• Green synthesis of carbon dots (CDs) using citric acid and urea via hydrothermal and microwave methods.
• Solvothermal synthesis of CDs/TiO2 nanohybrids.
• Characterization using UV-Vis, FT-IR, PL spectroscopy, HR-TEM, UV-Vis/DRS, and XPS.
• Photocatalytic hydrogen production experiments using ethanol as a sacrificial agent.

Main Results:

• Tunable properties of CDs achieved by varying precursor ratios and synthesis methods.
• Successful formation of CDs/TiO2 heterostructures with enhanced properties.
• Maximum hydrogen production rate of 0.906 μmol H2/min.
• Stable photocatalyst performance over multiple reuse cycles.

Conclusions:

• Optimized CDs/TiO2 nanohybrids are effective, environmentally friendly, and reusable photocatalysts for hydrogen production.
• The synthesis strategy allows for tailoring material properties for improved performance.
• This work contributes to the development of advanced materials for sustainable hydrogen generation.