Modulating band structure through introducing Cu⁰/Cu_xO composites for the improved visible light driven ammonia...

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Ceria-based materials offer tunable photocatalytic properties.
• Transition metals are crucial active sites for enhancing photocatalysis.
• Developing efficient, noble metal-free photocatalysts is a key research goal.

Purpose of the Study:

• To synthesize and characterize cuprous oxide-metallic copper composite-doped ceria nanorods.
• To investigate the effect of the Cu⁰/Cu_xO mole ratio on photocatalytic ammonia synthesis.
• To establish a strategy for designing advanced, metal-free photocatalysts.

Main Methods:

• Hydrothermal reduction method for assembling composite nanorods.
• Tuning surface structures by doping with transition metals (copper).
• Evaluating photocatalytic ammonia synthesis rates under full-spectrum and visible light.

Main Results:

• Photocatalytic ammonia synthesis rates showed an inverted "V-shaped" trend with increasing Cu⁰/Cu_xO ratio.
• Optimal ammonia production rate of ~900 µmol·g_cal^-1·h^-1 (full-spectra) achieved at a Cu⁰/Cu_xO ratio of ~0.16.
• This rate is 8 times higher than the pristine sample, with enhanced visible light absorption.

Conclusions:

• Cuprous oxide-metallic copper composites are effective dopants for ceria nanorods in photocatalysis.
• The optimized composite demonstrates significantly enhanced photocatalytic ammonia synthesis.
• This work presents a viable strategy for designing efficient, noble metal-free photocatalysts.