Understanding Bridging Sites and Accelerating Quantum Efficiency for Photocatalytic CO₂ Reduction

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Photocatalytic carbon dioxide reduction (CO2RR) is crucial for sustainable energy.
• Developing efficient photocatalysts with enhanced quantum efficiency remains a challenge.

Purpose of the Study:

• To design and investigate a novel double-shelled nanoboxes photocatalyst architecture.
• To enhance the quantum efficiency of photocatalytic CO2 reduction (CO2RR).

Main Methods:

• Fabrication of S_v-In₂S₃@2H-MoTe₂ double-shelled nanoboxes.
• Characterization using X-ray absorption near-edge structure (XANES).
• Analysis of interfacial dynamics and catalytic behavior via ultrafast spectroscopy (femtosecond transient absorption, time-resolved, in situ diffuse reflectance-Infrared Fourier transform spectroscopy).

Main Results:

• Engineered interfaces formed Mo-S polarized bridging bond sites.
• Achieved a 1.7-fold enhancement in photogenerated carrier concentration.
• Attained an internal quantum efficiency of 94.01% at 380 nm for CO2RR.

Conclusions:

• The novel nanoboxes architecture with tailored interfaces and Mo-S bridging sites significantly boosts CO2RR efficiency.
• Interface engineering and bridging sites are effective strategies for designing selective photocatalysts.
• This work provides a new pathway for developing advanced photocatalysts for CO2 conversion.