Enhanced hydrogen evolution from CuOx-C/TiO2 with multiple electron transport pathways

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Titanium dioxide (TiO2) is a widely studied photocatalyst.
• Improving TiO2 efficiency for hydrogen generation remains a key challenge.
• Co-catalysts and structural modifications are crucial for enhanced photoactivity.

Purpose of the Study:

• To develop a novel TiO2-based photocatalyst co-modified with CuOx and carbonaceous materials.
• To investigate the role of CuOx and carbonaceous materials in enhancing photocatalytic hydrogen generation.
• To elucidate the electron transfer mechanisms responsible for improved performance.

Main Methods:

• Simple hydrolysis and photo-reduction method for catalyst preparation.
• Scanning Electron Microscopy/Transmission Electron Microscopy (SEM/TEM) for morphological analysis.
• X-ray Photoelectron Spectroscopy (XPS) for elemental and chemical state analysis.
• Photocatalytic hydrogen evolution rate measurements.

Main Results:

• CuOx (0≤x≤2) and carbonaceous materials were successfully co-modified onto TiO2 nanoparticles.
• SEM/TEM confirmed carbonaceous material coating and XPS revealed multivalence Cu species.
• The optimal catalyst demonstrated a 56-fold increase in hydrogen evolution rate compared to pure C/TiO2.
• Multiple electron transfer pathways involving CuOx and carbonaceous materials were identified.

Conclusions:

• Co-modification with CuOx and carbonaceous materials significantly enhances TiO2 photocatalytic activity for hydrogen generation.
• CuOx species act as electron donors and proton reduction sites.
• Carbonaceous materials facilitate electron transfer from TiO2 to CuOx, reinforcing co-catalyst function.
• This work provides insights into designing efficient co-catalyst-based photocatalysts for hydrogen production.